sql

package
v0.6.2 Latest Latest
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 Go to latest Published: Apr 24, 2020 License: Apache-2.0 Imports: 25 Imported by: 0

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Index

Constants

View Source 
const (
	// InformationSchemaDatabaseName is the name of the information schema database.
	InformationSchemaDatabaseName = "information_schema"
	// FilesTableName is the name of the files table.
	FilesTableName = "files"
	// ColumnStatisticsTableName is the name of the column statistics table.
	ColumnStatisticsTableName = "column_statistics"
	// TablesTableName is the name of tables table.
	TablesTableName = "tables"
	// ColumnsTableName is the name of columns table.
	ColumnsTableName = "columns"
	// SchemataTableName is the name of the schemata table.
	SchemataTableName = "schemata"
)
View Source 
const ChecksumKey = "checksum"

ChecksumKey is the key in an index config to store the checksum.

View Source 
const DateLayout = "2006-01-02"

DateLayout is the layout of the MySQL date format in the representation Go understands.

View Source 
const DatetimeLayout = "2006-01-02 15:04:05"

DatetimeLayout is the layout of the MySQL date format in the representation Go understands.

View Source 
const IndexBatchSize = uint64(10000)

IndexBatchSize is the number of rows to save at a time when creating indexes.

View Source 
const (
	// QueryKey to access query in the context.
	QueryKey key = iota
)
View Source 
const TimestampLayout = "2006-01-02 15:04:05"

TimestampLayout is the formatting string with the layout of the timestamp using the format of Go "time" package.

Variables

View Source 
var (
	// ErrInvalidType is thrown when there is an unexpected type at some part of
	// the execution tree.
	ErrInvalidType = errors.NewKind("invalid type: %s")

	// ErrTableAlreadyExists is thrown when someone tries to create a
	// table with a name of an existing one
	ErrTableAlreadyExists = errors.NewKind("table with name %s already exists")

	// ErrTableNotFound is returned when the table is not available from the
	// current scope.
	ErrTableNotFound = errors.NewKind("table not found: %s")

	//ErrUnexpectedRowLength is thrown when the obtained row has more columns than the schema
	ErrUnexpectedRowLength = errors.NewKind("expected %d values, got %d")

	// ErrInvalidChildrenNumber is returned when the WithChildren method of a
	// node or expression is called with an invalid number of arguments.
	ErrInvalidChildrenNumber = errors.NewKind("%T: invalid children number, got %d, expected %d")

	// ErrDeleteRowNotFound
	ErrDeleteRowNotFound = errors.NewKind("row was not found when attempting to delete").New()
)
View Source 
var (
	// ErrIndexIDAlreadyRegistered is the error returned when there is already
	// an index with the same ID.
	ErrIndexIDAlreadyRegistered = errors.NewKind("an index with id %q has already been registered")

	// ErrIndexExpressionAlreadyRegistered is the error returned when there is
	// already an index with the same expression.
	ErrIndexExpressionAlreadyRegistered = errors.NewKind("there is already an index registered for the expressions: %s")

	// ErrIndexNotFound is returned when the index could not be found.
	ErrIndexNotFound = errors.NewKind("index %q	was not found")

	// ErrIndexDeleteInvalidStatus is returned when the index trying to delete
	// does not have a ready or outdated state.
	ErrIndexDeleteInvalidStatus = errors.NewKind("can't delete index %q because it's not ready for removal")
)
View Source 
var (
	// ErrNodeNotWritten is returned when the children are printed before the node.
	ErrNodeNotWritten = errors.New("treeprinter: a child was written before the node")
	// ErrNodeAlreadyWritten is returned when the node has already been written.
	ErrNodeAlreadyWritten = errors.New("treeprinter: node already written")
	// ErrChildrenAlreadyWritten is returned when the children have already been written.
	ErrChildrenAlreadyWritten = errors.New("treeprinter: children already written")
)
View Source 
var (
	// ErrTypeNotSupported is thrown when a specific type is not supported
	ErrTypeNotSupported = errors.NewKind("Type not supported: %s")

	// ErrUnexpectedType is thrown when a received type is not the expected
	ErrUnexpectedType = errors.NewKind("value at %d has unexpected type: %s")

	// ErrConvertingToTime is thrown when a value cannot be converted to a Time
	ErrConvertingToTime = errors.NewKind("value %q can't be converted to time.Time")

	// ErrCharTruncation is thrown when a Char value is textually longer than the destination capacity
	ErrCharTruncation = errors.NewKind("string value of %q is longer than destination capacity %d")

	// ErrVarCharTruncation is thrown when a VarChar value is textually longer than the destination capacity
	ErrVarCharTruncation = errors.NewKind("string value of %q is longer than destination capacity %d")

	// ErrValueNotNil is thrown when a value that was expected to be nil, is not
	ErrValueNotNil = errors.NewKind("value not nil: %#v")

	// ErrNotTuple is returned when the value is not a tuple.
	ErrNotTuple = errors.NewKind("value of type %T is not a tuple")

	// ErrInvalidColumnNumber is returned when a tuple has an invalid number of
	// arguments.
	ErrInvalidColumnNumber = errors.NewKind("tuple should contain %d column(s), but has %d")

	// ErrNotArray is returned when the value is not an array.
	ErrNotArray = errors.NewKind("value of type %T is not an array")

	// ErrConvertToSQL is returned when Convert failed.
	// It makes an error less verbose comparingto what spf13/cast returns.
	ErrConvertToSQL = errors.NewKind("incompatible conversion to SQL type: %s")
)
View Source 
var (
	// Null represents the null type.
	Null nullT

	// Int8 is an integer of 8 bits
	Int8 = numberT{/* contains filtered or unexported fields */}
	// Uint8 is an unsigned integer of 8 bits
	Uint8 = numberT{/* contains filtered or unexported fields */}
	// Int16 is an integer of 16 bits
	Int16 = numberT{/* contains filtered or unexported fields */}
	// Uint16 is an unsigned integer of 16 bits
	Uint16 = numberT{/* contains filtered or unexported fields */}
	// Int24 is an integer of 24 bits.
	Int24 = numberT{/* contains filtered or unexported fields */}
	// Uint24 is an unsigned integer of 24 bits.
	Uint24 = numberT{/* contains filtered or unexported fields */}
	// Int32 is an integer of 32 bits.
	Int32 = numberT{/* contains filtered or unexported fields */}
	// Uint32 is an unsigned integer of 32 bits.
	Uint32 = numberT{/* contains filtered or unexported fields */}
	// Int64 is an integer of 64 bytes.
	Int64 = numberT{/* contains filtered or unexported fields */}
	// Uint64 is an unsigned integer of 64 bits.
	Uint64 = numberT{/* contains filtered or unexported fields */}
	// Float32 is a floating point number of 32 bits.
	Float32 = numberT{/* contains filtered or unexported fields */}
	// Float64 is a floating point number of 64 bits.
	Float64 = numberT{/* contains filtered or unexported fields */}

	// Timestamp is an UNIX timestamp.
	Timestamp timestampT
	// Date is a date with day, month and year.
	Date dateT
	// Datetime is a date and a time
	Datetime datetimeT
	// Text is a string type.
	Text textT
	// Boolean is a boolean type.
	Boolean booleanT
	// JSON is a type that holds any valid JSON object.
	JSON jsonT
	// Blob is a type that holds a chunk of binary data.
	Blob blobT
)
View Source 
var ErrDatabaseNotFound = errors.NewKind("database not found: %s")

ErrDatabaseNotFound is thrown when a database is not found

View Source 
var ErrFunctionAlreadyRegistered = errors.NewKind("function '%s' is already registered")

ErrFunctionAlreadyRegistered is thrown when a function is already registered

View Source 
var ErrFunctionNotFound = errors.NewKind("function: '%s' not found")

ErrFunctionNotFound is thrown when a function is not found

View Source 
var ErrInvalidArgumentNumber = errors.NewKind("function '%s' expected %v arguments, %v received")

ErrInvalidArgumentNumber is returned when the number of arguments to call a function is different from the function arity.

View Source 
var ErrKeyNotFound = errors.NewKind("memory: key %d not found in cache")

ErrKeyNotFound is returned when the key could not be found in the cache.

View Source 
var ErrNoMemoryAvailable = errors.NewKind("no memory available")

ErrNoMemoryAvailable is returned when there is no more available memory.

View Source 
var ErrNotGenerator = errors.NewKind("cannot convert value of type %T to a generator")

ErrNotGenerator is returned when the value cannot be converted to a generator.

View Source 
var ErrPidAlreadyUsed = errors.NewKind("pid %d is already in use")

ErrPidAlreadyUsed is returned when the pid is already registered.

View Source 
var TimestampLayouts = []string{
	"2006-01-02",
	time.RFC3339,
	"20060102150405",
	"20060102",
}

TimestampLayouts hold extra timestamps allowed for parsing. It does not have all the layouts supported by mysql. Missing are two digit year versions of common cases and dates that use non common separators.

https://github.com/MariaDB/server/blob/mysql-5.5.36/sql-common/my_time.c#L124

Functions

func CacheKey 

func CacheKey(v interface{}) uint64

CacheKey returns a hash of the given value to be used as key in a cache.

func DefaultSessionConfig 

func DefaultSessionConfig() map[string]TypedValue

DefaultSessionConfig returns default values for session variables

func EvaluateCondition 

func EvaluateCondition(ctx *Context, cond Expression, row Row) (bool, error)

EvaluateCondition evaluates a condition, which is an expression whose value will be coerced to boolean.

func HasAvailableMemory 

func HasAvailableMemory(r Reporter) bool

HasAvailableMemory reports whether more memory is available to the program if it hasn't reached the max memory limit.

func HasDefaultValue 

func HasDefaultValue(s Session, key string) (bool, interface{})

HasDefaultValue checks if session variable value is the default one.

func IsArray 

func IsArray(t Type) bool

IsArray returns whether the given type is an array.

func IsChar 

func IsChar(t Type) bool

IsChar checks if t is a Char type.

func IsDate added in v0.6.2 

func IsDate(t Type) bool

IsDate checks if t is a date

func IsDatetime added in v0.6.2 

func IsDatetime(t Type) bool

IsDatetime checks if t is a datetime

func IsDecimal 

func IsDecimal(t Type) bool

IsDecimal checks if t is decimal type.

func IsInteger 

func IsInteger(t Type) bool

IsInteger checks if t is a (U)Int32/64 type.

func IsNull 

func IsNull(ex Expression) bool

IsNull returns true if expression is nil or is Null Type, otherwise false.

func IsNumber 

func IsNumber(t Type) bool

IsNumber checks if t is a number type

func IsSigned 

func IsSigned(t Type) bool

IsSigned checks if t is a signed type.

func IsText 

func IsText(t Type) bool

IsText checks if t is a text type.

func IsTime 

func IsTime(t Type) bool

IsTime checks if t is a timestamp, date or datetime

func IsTimestamp added in v0.6.2 

func IsTimestamp(t Type) bool

IsTimestamp checks if t is a timestamp

func IsTuple 

func IsTuple(t Type) bool

IsTuple checks if t is a tuple type. Note that tupleT instances with just 1 value are not considered as a tuple, but a parenthesized value.

func IsUnsigned 

func IsUnsigned(t Type) bool

IsUnsigned checks if t is an unsigned type.

func IsVarChar 

func IsVarChar(t Type) bool

IsVarChar checks if t is a varchar type.

func MySQLTypeName 

func MySQLTypeName(t Type) string

MySQLTypeName returns the MySQL display name for the given type.

func NumColumns 

func NumColumns(t Type) int

NumColumns returns the number of columns in a type. This is one for all types, except tuples.

func ValidateTime 

func ValidateTime(t time.Time) interface{}

ValidateTime receives a time and returns either that time or nil if it's not a valid time.

Types

type Aggregation 

type Aggregation interface {
	Expression
	// NewBuffer creates a new aggregation buffer and returns it as a Row.
	NewBuffer() Row
	// Update updates the given buffer with the given row.
	Update(ctx *Context, buffer, row Row) error
	// Merge merges a partial buffer into a global one.
	Merge(ctx *Context, buffer, partial Row) error
}

Aggregation implements an aggregation expression, where an aggregation buffer is created for each grouping (NewBuffer) and rows in the grouping are fed to the buffer (Update). Multiple buffers can be merged (Merge), making partial aggregations possible. Note that Eval must be called with the final aggregation buffer in order to get the final result.

type AscendIndex 

type AscendIndex interface {
	// AscendGreaterOrEqual returns an IndexLookup for keys that are greater
	// or equal to the given keys.
	AscendGreaterOrEqual(keys ...interface{}) (IndexLookup, error)
	// AscendLessThan returns an IndexLookup for keys that are less than the
	// given keys.
	AscendLessThan(keys ...interface{}) (IndexLookup, error)
	// AscendRange returns an IndexLookup for keys that are within the given
	// range.
	AscendRange(greaterOrEqual, lessThan []interface{}) (IndexLookup, error)
}

AscendIndex is an index that is sorted in ascending order.

type AsyncNode 

type AsyncNode interface {
	// IsAsync reports whether the node is async or not.
	IsAsync() bool
}

AsyncNode is a node that can be executed asynchronously.

type BaseSession 

type BaseSession struct {
	// contains filtered or unexported fields
}

BaseSession is the basic session type.

func (*BaseSession) Address 

func (s *BaseSession) Address() string

Address returns the server address.

func (*BaseSession) ClearWarnings 

func (s *BaseSession) ClearWarnings()

ClearWarnings cleans up session warnings

func (*BaseSession) Client 

func (s *BaseSession) Client() Client

Client returns session's client information.

func (*BaseSession) Get 

func (s *BaseSession) Get(key string) (Type, interface{})

Get implements the Session interface.

func (*BaseSession) GetAll 

func (s *BaseSession) GetAll() map[string]TypedValue

GetAll returns a copy of session configuration

func (*BaseSession) ID 

func (s *BaseSession) ID() uint32

ID implements the Session interface.

func (*BaseSession) Set 

func (s *BaseSession) Set(key string, typ Type, value interface{})

Set implements the Session interface.

func (*BaseSession) Warn 

func (s *BaseSession) Warn(warn *Warning)

Warn stores the warning in the session.

func (*BaseSession) WarningCount 

func (s *BaseSession) WarningCount() uint16

WarningCount returns a number of session warnings

func (*BaseSession) Warnings 

func (s *BaseSession) Warnings() []*Warning

Warnings returns a copy of session warnings (from the most recent - the last one) The function implements sql.Session interface

type Catalog 

type Catalog struct {
	FunctionRegistry
	*IndexRegistry
	*ProcessList
	*MemoryManager
	// contains filtered or unexported fields
}

Catalog holds databases, tables and functions.

func NewCatalog 

func NewCatalog() *Catalog

NewCatalog returns a new empty Catalog.

func (*Catalog) AddDatabase 

func (c *Catalog) AddDatabase(db Database)

AddDatabase adds a new database to the catalog.

func (*Catalog) AllDatabases 

func (c *Catalog) AllDatabases() Databases

AllDatabases returns all databases in the catalog.

func (*Catalog) CurrentDatabase 

func (c *Catalog) CurrentDatabase() string

CurrentDatabase returns the current database.

func (*Catalog) Database 

func (c *Catalog) Database(db string) (Database, error)

Database returns the database with the given name.

func (*Catalog) LockTable 

func (c *Catalog) LockTable(id uint32, table string)

LockTable adds a lock for the given table and session client. It is assumed the database is the current database in use.

func (*Catalog) SetCurrentDatabase 

func (c *Catalog) SetCurrentDatabase(db string)

SetCurrentDatabase changes the current database.

func (*Catalog) Table 

func (c *Catalog) Table(db, table string) (Table, error)

Table returns the table in the given database with the given name.

func (*Catalog) UnlockTables 

func (c *Catalog) UnlockTables(ctx *Context, id uint32) error

UnlockTables unlocks all tables for which the given session client has a lock.

type Checksumable 

type Checksumable interface {
	// Checksum returns a checksum and an error if there was any problem
	// computing or obtaining the checksum.
	Checksum() (string, error)
}

Checksumable provides the checksum of some data.

type Client 

type Client struct {
	// User of the session.
	User string
	// Address of the client.
	Address string
}

Client holds session user information.

type Column 

type Column struct {
	// Name is the name of the column.
	Name string
	// Type is the data type of the column.
	Type Type
	// Default contains the default value of the column or nil if it is NULL.
	Default interface{}
	// Nullable is true if the column can contain NULL values, or false
	// otherwise.
	Nullable bool
	// Source is the name of the table this column came from.
	Source string
	// PrimaryKey is true if the column is part of the primary key for its table.
	PrimaryKey bool
}

Column is the definition of a table column. As SQL:2016 puts it: 

A column is a named component of a table. It has a data type, a default,
and a nullability characteristic.

func (*Column) Check 

func (c *Column) Check(v interface{}) bool

Check ensures the value is correct for this column.

func (*Column) Equals 

func (c *Column) Equals(c2 *Column) bool

Equals checks whether two columns are equal.

type Context 

type Context struct {
	context.Context
	Session
	Memory *MemoryManager
	// contains filtered or unexported fields
}

Context of the query execution.

func NewContext 

func NewContext(
	ctx context.Context,
	opts ...ContextOption,
) *Context

NewContext creates a new query context. Options can be passed to configure the context. If some aspect of the context is not configure, the default value will be used. By default, the context will have an empty base session, a noop tracer and a memory manager using the process reporter.

func NewEmptyContext 

func NewEmptyContext() *Context

NewEmptyContext returns a default context with default values.

func (*Context) Error 

func (c *Context) Error(code int, msg string, args ...interface{})

Error adds an error as warning to the session.

func (*Context) Pid 

func (c *Context) Pid() uint64

Pid returns the process id associated with this context.

func (*Context) Query 

func (c *Context) Query() string

Query returns the query string associated with this context.

func (*Context) RootSpan 

func (c *Context) RootSpan() opentracing.Span

RootSpan returns the root span, if any.

func (*Context) Span 

func (c *Context) Span(
	opName string,
	opts ...opentracing.StartSpanOption,
) (opentracing.Span, *Context)

Span creates a new tracing span with the given context. It will return the span and a new context that should be passed to all childrens of this span.

func (*Context) Warn 

func (c *Context) Warn(code int, msg string, args ...interface{})

Warn adds a warning to the session.

func (*Context) WithContext 

func (c *Context) WithContext(ctx context.Context) *Context

WithContext returns a new context with the given underlying context.

type ContextOption 

type ContextOption func(*Context)

ContextOption is a function to configure the context.

func WithMemoryManager 

func WithMemoryManager(m *MemoryManager) ContextOption

WithMemoryManager adds the given memory manager to the context.

func WithPid 

func WithPid(pid uint64) ContextOption

WithPid adds the given pid to the context.

func WithQuery 

func WithQuery(q string) ContextOption

WithQuery adds the given query to the context.

func WithRootSpan 

func WithRootSpan(s opentracing.Span) ContextOption

WithRootSpan sets the root span of the context.

func WithSession 

func WithSession(s Session) ContextOption

WithSession adds the given session to the context.

func WithTracer 

func WithTracer(t opentracing.Tracer) ContextOption

WithTracer adds the given tracer to the context.

type Database 

type Database interface {
	Nameable
	// Tables returns the information of all tables.
	Tables() map[string]Table
}

Database represents the database.

func NewInformationSchemaDatabase 

func NewInformationSchemaDatabase(cat *Catalog) Database

NewInformationSchemaDatabase creates a new INFORMATION_SCHEMA Database.

type Databaser 

type Databaser interface {
	// Database the current database.
	Database() Database
	// WithDatabase returns a new node instance with the database replaced with
	// the one given as parameter.
	WithDatabase(Database) (Node, error)
}

Databaser is a node that contains a reference to a database.

type Databases 

type Databases []Database

Databases is a collection of Database.

func (*Databases) Add 

func (d *Databases) Add(db Database)

Add adds a new database.

func (Databases) Database 

func (d Databases) Database(name string) (Database, error)

Database returns the Database with the given name if it exists.

func (Databases) Table 

func (d Databases) Table(dbName string, tableName string) (Table, error)

Table returns the Table with the given name if it exists.

type Deleter 

type Deleter interface {
	// Delete the given row. Returns ErrDeleteRowNotFound if the row was not found.
	Delete(*Context, Row) error
}

Deleter allow rows to be deleted from tables.

type DescendIndex 

type DescendIndex interface {
	// DescendGreater returns an IndexLookup for keys that are greater
	// than the given keys.
	DescendGreater(keys ...interface{}) (IndexLookup, error)
	// DescendLessOrEqual returns an IndexLookup for keys that are less than or
	// equal to the given keys.
	DescendLessOrEqual(keys ...interface{}) (IndexLookup, error)
	// DescendRange returns an IndexLookup for keys that are within the given
	// range.
	DescendRange(lessOrEqual, greaterThan []interface{}) (IndexLookup, error)
}

DescendIndex is an index that is sorted in descending order.

type Disposable 

type Disposable interface {
	// Dispose the contents.
	Dispose()
}

Disposable objects can erase all their content when they're no longer in use. They should not be used again after they've been disposed.

type DisposeFunc 

type DisposeFunc func()

DisposeFunc is a function to completely erase a cache and remove it from the manager.

type Expression 

type Expression interface {
	Resolvable
	fmt.Stringer
	// Type returns the expression type.
	Type() Type
	// IsNullable returns whether the expression can be null.
	IsNullable() bool
	// Eval evaluates the given row and returns a result.
	Eval(*Context, Row) (interface{}, error)
	// Children returns the children expressions of this expression.
	Children() []Expression
	// WithChildren returns a copy of the expression with children replaced.
	// It will return an error if the number of children is different than
	// the current number of children. They must be given in the same order
	// as they are returned by Children.
	WithChildren(...Expression) (Expression, error)
}

Expression is a combination of one or more SQL expressions.

type Expressioner 

type Expressioner interface {
	// Expressions returns the list of expressions contained by the node.
	Expressions() []Expression
	// WithExpressions returns a copy of the node with expressions replaced.
	// It will return an error if the number of expressions is different than
	// the current number of expressions. They must be given in the same order
	// as they are returned by Expressions.
	WithExpressions(...Expression) (Node, error)
}

Expressioner is a node that contains expressions.

type FilteredTable 

type FilteredTable interface {
	Table
	HandledFilters(filters []Expression) []Expression
	WithFilters(filters []Expression) Table
	Filters() []Expression
}

FilteredTable is a table that can produce a specific RowIter that's more optimized given the filters.

type Freeable 

type Freeable interface {
	// Free the memory.
	Free()
}

Freeable objects can free their memory.

type Function 

type Function interface {
	// Call invokes the function.
	Call(...Expression) (Expression, error)
	// contains filtered or unexported methods
}

Function is a function defined by the user that can be applied in a SQL query.

type Function0 

type Function0 struct {
	Name string
	Fn   func() Expression
}

Function0 is a function with 0 arguments.

func (Function0) Call 

func (fn Function0) Call(args ...Expression) (Expression, error)

Call implements the Function interface.

type Function1 

type Function1 struct {
	Name string
	Fn   func(e Expression) Expression
}

Function1 is a function with 1 argument.

func (Function1) Call 

func (fn Function1) Call(args ...Expression) (Expression, error)

Call implements the Function interface.

type Function2 

type Function2 struct {
	Name string
	Fn   func(e1, e2 Expression) Expression
}

Function2 is a function with 2 arguments.

func (Function2) Call 

func (fn Function2) Call(args ...Expression) (Expression, error)

Call implements the Function interface.

type Function3 

type Function3 struct {
	Name string
	Fn   func(e1, e2, e3 Expression) Expression
}

Function3 is a function with 3 arguments.

func (Function3) Call 

func (fn Function3) Call(args ...Expression) (Expression, error)

Call implements the Function interface.

type Function4 

type Function4 struct {
	Name string
	Fn   func(e1, e2, e3, e4 Expression) Expression
}

Function4 is a function with 4 arguments.

func (Function4) Call 

func (fn Function4) Call(args ...Expression) (Expression, error)

Call implements the Function interface.

type Function5 

type Function5 struct {
	Name string
	Fn   func(e1, e2, e3, e4, e5 Expression) Expression
}

Function5 is a function with 5 arguments.

func (Function5) Call 

func (fn Function5) Call(args ...Expression) (Expression, error)

Call implements the Function interface.

type Function6 

type Function6 struct {
	Name string
	Fn   func(e1, e2, e3, e4, e5, e6 Expression) Expression
}

Function6 is a function with 6 arguments.

func (Function6) Call 

func (fn Function6) Call(args ...Expression) (Expression, error)

Call implements the Function interface.

type Function7 

type Function7 struct {
	Name string
	Fn   func(e1, e2, e3, e4, e5, e6, e7 Expression) Expression
}

Function7 is a function with 7 arguments.

func (Function7) Call 

func (fn Function7) Call(args ...Expression) (Expression, error)

Call implements the Function interface.

type FunctionN 

type FunctionN struct {
	Name string
	Fn   func(...Expression) (Expression, error)
}

FunctionN is a function with variable number of arguments. This function is expected to return ErrInvalidArgumentNumber if the arity does not match, since the check has to be done in the implementation.

func (FunctionN) Call 

func (fn FunctionN) Call(args ...Expression) (Expression, error)

Call implements the Function interface.

type FunctionRegistry 

type FunctionRegistry map[string]Function

FunctionRegistry is used to register functions. It is used both for builtin and User-Defined Functions.

func NewFunctionRegistry 

func NewFunctionRegistry() FunctionRegistry

NewFunctionRegistry creates a new FunctionRegistry.

func (FunctionRegistry) Function 

func (r FunctionRegistry) Function(name string) (Function, error)

Function returns a function with the given name.

func (FunctionRegistry) MustRegister 

func (r FunctionRegistry) MustRegister(fn ...Function)

MustRegister registers functions. If function with that name is already registered, it will panic!

func (FunctionRegistry) Register 

func (r FunctionRegistry) Register(fn ...Function) error

Register registers functions. If function with that name is already registered, the ErrFunctionAlreadyRegistered will be returned

type Generator 

type Generator interface {
	// Next value in the generator.
	Next() (interface{}, error)
	// Close the generator and dispose resources.
	Close() error
}

Generator will generate a set of values for a given row.

func NewArrayGenerator 

func NewArrayGenerator(array []interface{}) Generator

NewArrayGenerator creates a generator for a given array.

func ToGenerator 

func ToGenerator(v interface{}) (Generator, error)

ToGenerator converts a value to a generator if possible.

type Index 

type Index interface {
	// Get returns an IndexLookup for the given key in the index.
	Get(key ...interface{}) (IndexLookup, error)
	// Has checks if the given key is present in the index.
	Has(partition Partition, key ...interface{}) (bool, error)
	// ID returns the identifier of the index.
	ID() string
	// Database returns the database name this index belongs to.
	Database() string
	// Table returns the table name this index belongs to.
	Table() string
	// Expressions returns the indexed expressions. If the result is more than
	// one expression, it means the index has multiple columns indexed. If it's
	// just one, it means it may be an expression or a column.
	Expressions() []string
	// Driver ID of the index.
	Driver() string
}

Index is the basic representation of an index. It can be extended with more functionality by implementing more specific interfaces.

type IndexDriver 

type IndexDriver interface {
	// ID returns the unique name of the driver.
	ID() string
	// Create a new index. If exprs is more than one expression, it means the
	// index has multiple columns indexed. If it's just one, it means it may
	// be an expression or a column.
	Create(db, table, id string, expressions []Expression, config map[string]string) (Index, error)
	// LoadAll loads all indexes for given db and table.
	LoadAll(db, table string) ([]Index, error)
	// Save the given index for all partitions.
	Save(*Context, Index, PartitionIndexKeyValueIter) error
	// Delete the given index for all partitions in the iterator.
	Delete(Index, PartitionIter) error
}

IndexDriver manages the coordination between the indexes and their representation on disk.

type IndexKeyValueIter 

type IndexKeyValueIter interface {
	// Next returns the next tuple of index key values. The length of the
	// returned slice will be the same as the number of columns used to
	// create this iterator. The second returned parameter is a repo's location.
	Next() ([]interface{}, []byte, error)
	io.Closer
}

IndexKeyValueIter is an iterator of index key values, that is, a tuple of the values that will be index keys.

type IndexLookup 

type IndexLookup interface {
	// Values returns the values in the subset of the index.
	Values(Partition) (IndexValueIter, error)

	// Indexes returns the IDs of all indexes involved in this lookup.
	Indexes() []string
}

IndexLookup is a subset of an index. More specific interfaces can be implemented to grant more capabilities to the index lookup.

type IndexRegistry 

type IndexRegistry struct {
	// Root path where all the data of the indexes is stored on disk.
	Root string
	// contains filtered or unexported fields
}

IndexRegistry keeps track of all indexes in the engine.

func NewIndexRegistry 

func NewIndexRegistry() *IndexRegistry

NewIndexRegistry returns a new Index Registry.

func (*IndexRegistry) AddIndex 

func (r *IndexRegistry) AddIndex(
	idx Index,
) (created chan<- struct{}, ready <-chan struct{}, err error)

AddIndex adds the given index to the registry. The added index will be marked as creating, so nobody can't register two indexes with the same expression or id while the other is still being created. When something is sent through the returned channel, it means the index has finished it's creation and will be marked as ready. Another channel is returned to notify the user when the index is ready.

func (*IndexRegistry) CanRemoveIndex 

func (r *IndexRegistry) CanRemoveIndex(idx Index) bool

CanRemoveIndex returns whether the given index is ready to be removed.

func (*IndexRegistry) CanUseIndex 

func (r *IndexRegistry) CanUseIndex(idx Index) bool

CanUseIndex returns whether the given index is ready to use or not.

func (*IndexRegistry) DefaultIndexDriver 

func (r *IndexRegistry) DefaultIndexDriver() IndexDriver

DefaultIndexDriver returns the default index driver, which is the only driver when there is 1 driver in the registry. If there are more than 1 drivers in the registry, this will return the empty string, as there is no clear default driver.

func (*IndexRegistry) DeleteIndex 

func (r *IndexRegistry) DeleteIndex(db, id string, force bool) (<-chan struct{}, error)

DeleteIndex deletes an index from the registry by its id. First, it marks the index for deletion but does not remove it, so queries that are using it may still do so. The returned channel will send a message when the index can be deleted from disk. If force is true, it will delete the index even if it's not ready for usage. Only use that parameter if you know what you're doing.

func (*IndexRegistry) ExpressionsWithIndexes 

func (r *IndexRegistry) ExpressionsWithIndexes(
	db string,
	exprs ...Expression,
) [][]Expression

ExpressionsWithIndexes finds all the combinations of expressions with matching indexes. This only matches multi-column indexes.

func (*IndexRegistry) Index 

func (r *IndexRegistry) Index(db, id string) Index

Index returns the index with the given id. It may return nil if the index is not found.

func (*IndexRegistry) IndexByExpression 

func (r *IndexRegistry) IndexByExpression(db string, expr ...Expression) Index

IndexByExpression returns an index by the given expression. It will return nil it the index is not found. If more than one expression is given, all of them must match for the index to be matched.

func (*IndexRegistry) IndexDriver 

func (r *IndexRegistry) IndexDriver(id string) IndexDriver

IndexDriver returns the IndexDriver with the given ID.

func (*IndexRegistry) IndexesByTable 

func (r *IndexRegistry) IndexesByTable(db, table string) []Index

IndexesByTable returns a slice of all the indexes existing on the given table.

func (*IndexRegistry) LoadIndexes 

func (r *IndexRegistry) LoadIndexes(dbs Databases) error

LoadIndexes loads all indexes for all dbs, tables and drivers.

func (*IndexRegistry) MarkOutdated 

func (r *IndexRegistry) MarkOutdated(idx Index)

MarkOutdated sets the index status as outdated. This method is not thread safe and should not be used directly except for testing.

func (*IndexRegistry) RegisterIndexDriver 

func (r *IndexRegistry) RegisterIndexDriver(driver IndexDriver)

RegisterIndexDriver registers a new index driver.

func (*IndexRegistry) ReleaseIndex 

func (r *IndexRegistry) ReleaseIndex(idx Index)

ReleaseIndex releases an index after it's been used.

type IndexStatus 

type IndexStatus byte

IndexStatus represents the current status in which the index is. 

const (
	// IndexNotReady means the index is not ready to be used.
	IndexNotReady IndexStatus = iota
	// IndexReady means the index can be used.
	IndexReady
	// IndexOutdated means the index is loaded but will not be used because the
	// contents in it are outdated.
	IndexOutdated
)

func (IndexStatus) IsUsable 

func (s IndexStatus) IsUsable() bool

IsUsable returns whether the index can be used or not based on the status.

func (IndexStatus) String 

func (s IndexStatus) String() string

type IndexValueIter 

type IndexValueIter interface {
	// Next returns the next value (repo's location) - see IndexKeyValueIter.
	Next() ([]byte, error)
	io.Closer
}

IndexValueIter is an iterator of index values.

type IndexableTable 

type IndexableTable interface {
	Table
	WithIndexLookup(IndexLookup) Table
	IndexLookup() IndexLookup
	IndexKeyValues(*Context, []string) (PartitionIndexKeyValueIter, error)
}

IndexableTable represents a table that supports being indexed and receiving indexes to be able to speed up its execution.

type Inserter 

type Inserter interface {
	// Insert the given row.
	Insert(*Context, Row) error
}

Inserter allow rows to be inserted in them.

type KeyValueCache 

type KeyValueCache interface {
	// Put a new value in the cache.
	Put(uint64, interface{}) error
	// Get the value with the given key.
	Get(uint64) (interface{}, error)
}

KeyValueCache is a cache of key value pairs.

type Lockable 

type Lockable interface {
	Nameable
	// Lock locks the table either for reads or writes. Any session clients can
	// read while the table is locked for read, but not write.
	// When the table is locked for write, nobody can write except for the
	// session client that requested the lock.
	Lock(ctx *Context, write bool) error
	// Unlock releases the lock for the current session client. It blocks until
	// all reads or writes started during the lock are finished.
	// Context may be nil if the unlock it's because the connection was closed.
	// The id will always be provided, since in some cases context is not
	// available.
	Unlock(ctx *Context, id uint32) error
}

Lockable should be implemented by tables that can be locked and unlocked.

type MemoryManager 

type MemoryManager struct {
	// contains filtered or unexported fields
}

MemoryManager is in charge of keeping track and managing all the components that operate in memory. There should only be one instance of a memory manager running at the same time in each process.

func NewMemoryManager 

func NewMemoryManager(r Reporter) *MemoryManager

NewMemoryManager creates a new manager with the given memory reporter. If nil is given, then the Process reporter will be used by default.

func (*MemoryManager) Free 

func (m *MemoryManager) Free()

Free the memory of all freeable caches.

func (*MemoryManager) HasAvailable 

func (m *MemoryManager) HasAvailable() bool

HasAvailable reports whether the memory manager has any available memory.

func (*MemoryManager) NewHistoryCache 

func (m *MemoryManager) NewHistoryCache() (KeyValueCache, DisposeFunc)

NewHistoryCache returns an empty history cache and a function to dispose it when it's no longer needed.

func (*MemoryManager) NewLRUCache 

func (m *MemoryManager) NewLRUCache(size uint) (KeyValueCache, DisposeFunc)

NewLRUCache returns an empty LRU cache and a function to dispose it when it's no longer needed.

func (*MemoryManager) NewRowsCache 

func (m *MemoryManager) NewRowsCache() (RowsCache, DisposeFunc)

NewRowsCache returns an empty rows cache and a function to dispose it when it's no longer needed.

type Mergeable 

type Mergeable interface {
	// IsMergeable checks whether the current IndexLookup can be merged with
	// the given one.
	IsMergeable(IndexLookup) bool
}

Mergeable is a specialization of IndexLookup to check if an IndexLookup can be merged with another one.

type Nameable 

type Nameable interface {
	// Name returns the name.
	Name() string
}

Nameable is something that has a name.

type NegateIndex 

type NegateIndex interface {
	// Not returns an IndexLookup for keys that are not equal
	// to the given keys.
	Not(keys ...interface{}) (IndexLookup, error)
}

NegateIndex is an index that supports retrieving negated values.

type Node 

type Node interface {
	Resolvable
	fmt.Stringer
	// Schema of the node.
	Schema() Schema
	// Children nodes.
	Children() []Node
	// RowIter produces a row iterator from this node.
	RowIter(*Context) (RowIter, error)
	// WithChildren returns a copy of the node with children replaced.
	// It will return an error if the number of children is different than
	// the current number of children. They must be given in the same order
	// as they are returned by Children.
	WithChildren(...Node) (Node, error)
}

Node is a node in the execution plan tree.

type OpaqueNode 

type OpaqueNode interface {
	Node
	// Opaque reports whether the node is opaque or not.
	Opaque() bool
}

OpaqueNode is a node that doesn't allow transformations to its children and acts a a black box.

type Partition 

type Partition interface {
	Key() []byte
}

Partition represents a partition from a SQL table.

type PartitionCounter 

type PartitionCounter interface {
	// PartitionCount returns the number of partitions.
	PartitionCount(*Context) (int64, error)
}

PartitionCounter can return the number of partitions.

type PartitionIndexKeyValueIter 

type PartitionIndexKeyValueIter interface {
	// Next returns the next partition and the IndexKeyValueIter for that
	// partition.
	Next() (Partition, IndexKeyValueIter, error)
	io.Closer
}

PartitionIndexKeyValueIter is an iterator of partitions that will return the partition and the IndexKeyValueIter of that partition.

type PartitionIter 

type PartitionIter interface {
	io.Closer
	Next() (Partition, error)
}

PartitionIter is an iterator that retrieves partitions.

type PartitionProgress 

type PartitionProgress struct {
	Progress
}

PartitionProgress keeps track of a partition progress

func (PartitionProgress) String 

func (p PartitionProgress) String() string

type Process 

type Process struct {
	Pid        uint64
	Connection uint32
	User       string
	Type       ProcessType
	Query      string
	Progress   map[string]TableProgress
	StartedAt  time.Time
	Kill       context.CancelFunc
}

Process represents a process in the SQL server.

func (*Process) Done 

func (p *Process) Done()

Done needs to be called when this process has finished.

func (*Process) Seconds 

func (p *Process) Seconds() uint64

Seconds returns the number of seconds this process has been running.

type ProcessList 

type ProcessList struct {
	// contains filtered or unexported fields
}

ProcessList is a structure that keeps track of all the processes and their status.

func NewProcessList 

func NewProcessList() *ProcessList

NewProcessList creates a new process list.

func (*ProcessList) AddPartitionProgress 

func (pl *ProcessList) AddPartitionProgress(pid uint64, tableName, partitionName string, total int64)

AddPartitionProgress adds a new item to track progress from to the process with the given pid. If the pid or the table does not exist, it will do nothing.

func (*ProcessList) AddProcess 

func (pl *ProcessList) AddProcess(
	ctx *Context,
	typ ProcessType,
	query string,
) (*Context, error)

AddProcess adds a new process to the list given a process type and a query. Steps is a map between the name of the items that need to be completed and the total amount in these items. -1 means unknown. It returns a new context that should be passed around from now on. That context will be cancelled if the process is killed.

func (*ProcessList) AddTableProgress 

func (pl *ProcessList) AddTableProgress(pid uint64, name string, total int64)

AddTableProgress adds a new item to track progress from to the process with the given pid. If the pid does not exist, it will do nothing.

func (*ProcessList) Done 

func (pl *ProcessList) Done(pid uint64)

Done removes the finished process with the given pid from the process list. If the process does not exist, it will do nothing.

func (*ProcessList) Kill 

func (pl *ProcessList) Kill(connID uint32)

Kill terminates all queries for a given connection id.

func (*ProcessList) KillOnlyQueries 

func (pl *ProcessList) KillOnlyQueries(connID uint32)

KillOnlyQueries kills all queries, but not index creation queries, for a given connection id.

func (*ProcessList) Processes 

func (pl *ProcessList) Processes() []Process

Processes returns the list of current running processes.

func (*ProcessList) RemovePartitionProgress 

func (pl *ProcessList) RemovePartitionProgress(pid uint64, tableName, partitionName string)

RemovePartitionProgress removes an existing item tracking progress from the process with the given pid, if it exists.

func (*ProcessList) RemoveTableProgress 

func (pl *ProcessList) RemoveTableProgress(pid uint64, name string)

RemoveTableProgress removes an existing item tracking progress from the process with the given pid, if it exists.

func (*ProcessList) UpdatePartitionProgress 

func (pl *ProcessList) UpdatePartitionProgress(pid uint64, tableName, partitionName string, delta int64)

UpdatePartitionProgress updates the progress of the table partition with the given name for the process with the given pid.

func (*ProcessList) UpdateTableProgress 

func (pl *ProcessList) UpdateTableProgress(pid uint64, name string, delta int64)

UpdateTableProgress updates the progress of the table with the given name for the process with the given pid.

type ProcessType 

type ProcessType byte

ProcessType is the type of process. 

const (
	// QueryProcess is a query process.
	QueryProcess ProcessType = iota
	// CreateIndexProcess is a process to create an index.
	CreateIndexProcess
)

func (ProcessType) String 

func (p ProcessType) String() string

type Progress 

type Progress struct {
	Name  string
	Done  int64
	Total int64
}

Progress between done items and total items.

type ProjectedTable 

type ProjectedTable interface {
	Table
	WithProjection(colNames []string) Table
	Projection() []string
}

ProjectedTable is a table that can produce a specific RowIter that's more optimized given the columns that are projected.

type Replacer 

type Replacer interface {
	Deleter
	Inserter
}

Replacer allows rows to be replaced through a Delete (if applicable) then Insert.

type Reporter 

type Reporter interface {
	// MaxMemory returns the maximum number of memory allowed in bytes.
	MaxMemory() uint64
	// UsedMemory returns the memory in use in bytes.
	UsedMemory() uint64
}

Reporter is a component that gives information about the memory usage. 

var ProcessMemory Reporter = new(processReporter)

ProcessMemory is a reporter for the memory used by the process and the maximum amount of memory allowed controlled by the MAX_MEMORY environment variable.

type Resolvable 

type Resolvable interface {
	// Resolved returns whether the node is resolved.
	Resolved() bool
}

Resolvable is something that can be resolved or not.

type Row 

type Row []interface{}

Row is a tuple of values.

func NewRow 

func NewRow(values ...interface{}) Row

NewRow creates a row from the given values.

func NodeToRows 

func NodeToRows(ctx *Context, n Node) ([]Row, error)

NodeToRows converts a node to a slice of rows.

func RowIterToRows 

func RowIterToRows(i RowIter) ([]Row, error)

RowIterToRows converts a row iterator to a slice of rows.

func (Row) Copy 

func (r Row) Copy() Row

Copy creates a new row with the same values as the current one.

func (Row) Equals 

func (r Row) Equals(row Row, schema Schema) (bool, error)

Equals checks whether two rows are equal given a schema.

type RowIter 

type RowIter interface {
	// Next retrieves the next row. It will return io.EOF if it's the last row.
	// After retrieving the last row, Close will be automatically closed.
	Next() (Row, error)
	// Close the iterator.
	Close() error
}

RowIter is an iterator that produces rows.

func NewSpanIter 

func NewSpanIter(span opentracing.Span, iter RowIter) RowIter

NewSpanIter creates a RowIter executed in the given span.

func RowsToRowIter 

func RowsToRowIter(rows ...Row) RowIter

RowsToRowIter creates a RowIter that iterates over the given rows.

type RowsCache 

type RowsCache interface {
	// Add a new row to the cache. If there is no memory available, it will try to
	// free some memory. If after that there is still no memory available, it
	// will return an error and erase all the content of the cache.
	Add(Row) error
	// Get all rows.
	Get() []Row
}

RowsCache is a cache of rows.

type Schema 

type Schema []*Column

Schema is the definition of a table.

func (Schema) CheckRow 

func (s Schema) CheckRow(row Row) error

CheckRow checks the row conforms to the schema.

func (Schema) Contains 

func (s Schema) Contains(column string, source string) bool

Contains returns whether the schema contains a column with the given name.

func (Schema) Equals 

func (s Schema) Equals(s2 Schema) bool

Equals checks whether the given schema is equal to this one.

func (Schema) IndexOf 

func (s Schema) IndexOf(column, source string) int

IndexOf returns the index of the given column in the schema or -1 if it's not present.

type Session 

type Session interface {
	// Address of the server.
	Address() string
	// User of the session.
	Client() Client
	// Set session configuration.
	Set(key string, typ Type, value interface{})
	// Get session configuration.
	Get(key string) (Type, interface{})
	// GetAll returns a copy of session configuration
	GetAll() map[string]TypedValue
	// ID returns the unique ID of the connection.
	ID() uint32
	// Warn stores the warning in the session.
	Warn(warn *Warning)
	// Warnings returns a copy of session warnings (from the most recent).
	Warnings() []*Warning
	// ClearWarnings cleans up session warnings.
	ClearWarnings()
	// WarningCount returns a number of session warnings
	WarningCount() uint16
}

Session holds the session data.

func NewBaseSession 

func NewBaseSession() Session

NewBaseSession creates a new empty session.

func NewSession 

func NewSession(server, client, user string, id uint32) Session

NewSession creates a new session with data.

type SetOperations 

type SetOperations interface {
	// Intersection returns a new index subset with the intersection of the
	// current IndexLookup and the ones given.
	Intersection(...IndexLookup) IndexLookup
	// Union returns a new index subset with the union of the current
	// IndexLookup and the ones given.
	Union(...IndexLookup) IndexLookup
	// Difference returns a new index subset with the difference between the
	// current IndexLookup and the ones given.
	Difference(...IndexLookup) IndexLookup
}

SetOperations is a specialization of IndexLookup that enables set operations between several IndexLookups.

type Table 

type Table interface {
	Nameable
	String() string
	Schema() Schema
	Partitions(*Context) (PartitionIter, error)
	PartitionRows(*Context, Partition) (RowIter, error)
}

Table represents the backend of a SQL table.

type TableCreator 

type TableCreator interface {
	CreateTable(ctx *Context, name string, schema Schema) error
}

TableCreator should be implemented by databases that can create new tables.

type TableDropper 

type TableDropper interface {
	DropTable(ctx *Context, name string) error
}

TableDropper should be implemented by databases that can drop tables.

type TableProgress 

type TableProgress struct {
	Progress
	PartitionsProgress map[string]PartitionProgress
}

TableProgress keeps track of a table progress, and for each of its partitions

func NewTableProgress 

func NewTableProgress(name string, total int64) TableProgress

func (TableProgress) String 

func (p TableProgress) String() string

type TableWrapper 

type TableWrapper interface {
	// Underlying returns the underlying table.
	Underlying() Table
}

TableWrapper is a node that wraps the real table. This is needed because wrappers cannot implement some methods the table may implement.

type Tableable 

type Tableable interface {
	// Table returns the table name.
	Table() string
}

Tableable is something that has a table.

type TransformExprFunc 

type TransformExprFunc func(Expression) (Expression, error)

TransformExprFunc is a function that given an expression will return that expression as is or transformed along with an error, if any.

type TransformNodeFunc 

type TransformNodeFunc func(Node) (Node, error)

TransformNodeFunc is a function that given a node will return that node as is or transformed along with an error, if any.

type TreePrinter 

type TreePrinter struct {
	// contains filtered or unexported fields
}

TreePrinter is a printer for tree nodes.

func NewTreePrinter 

func NewTreePrinter() *TreePrinter

NewTreePrinter creates a new tree printer.

func (*TreePrinter) String 

func (p *TreePrinter) String() string

String returns the output of the printed tree.

func (*TreePrinter) WriteChildren 

func (p *TreePrinter) WriteChildren(children ...string) error

WriteChildren writes a children of the tree.

func (*TreePrinter) WriteNode 

func (p *TreePrinter) WriteNode(format string, args ...interface{}) error

WriteNode writes the main node.

type Type 

type Type interface {
	// Type returns the query.Type for the given Type.
	Type() query.Type
	// Covert a value of a compatible type to a most accurate type.
	Convert(interface{}) (interface{}, error)
	// Compare returns an integer comparing two values.
	// The result will be 0 if a==b, -1 if a < b, and +1 if a > b.
	Compare(interface{}, interface{}) (int, error)
	// SQL returns the sqltypes.Value for the given value.
	SQL(interface{}) (sqltypes.Value, error)
	fmt.Stringer
}

Type represent a SQL type.

func Array 

func Array(underlying Type) Type

Array returns a new Array type of the given underlying type.

func Char 

func Char(length int) Type

Char returns a new Char type of the given length.

func MysqlTypeToType 

func MysqlTypeToType(sql query.Type) (Type, error)

MysqlTypeToType gets the column type using the mysql type

func Tuple 

func Tuple(types ...Type) Type

Tuple returns a new tuple type with the given element types.

func UnderlyingType 

func UnderlyingType(t Type) Type

UnderlyingType returns the underlying type of an array if the type is an array, or the type itself in any other case.

func VarChar 

func VarChar(length int) Type

VarChar returns a new VarChar type of the given length.

type TypedValue 

type TypedValue struct {
	Typ   Type
	Value interface{}
}

TypedValue is a value along with its type.

type UnresolvedDatabase 

type UnresolvedDatabase string

UnresolvedDatabase is a database which has not been resolved yet.

func (UnresolvedDatabase) Name 

func (d UnresolvedDatabase) Name() string

Name returns the database name.

func (UnresolvedDatabase) Tables 

func (UnresolvedDatabase) Tables() map[string]Table

Tables returns the tables in the database.

type Updater 

type Updater interface {
	// Update the given row. Provides both the old and new rows.
	Update(ctx *Context, old Row, new Row) error
}

Updater allows rows to be updated.

type Warning 

type Warning struct {
	Level   string
	Message string
	Code    int
}

Warning stands for mySQL warning record.

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