sql

package
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 Go to latest Published: Mar 10, 2021 License: Apache-2.0 Imports: 9 Imported by: 5,218

Documentation

Overview

Package sql provides wrappers around the standard database/sql package to allow the generated code to interact with a statically-typed API.

Users that are interacting with this package should be aware that the following builders don't check the given SQL syntax nor validate or escape user-inputs. ~All validations are expected to be happened in the generated ent package.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func As 

func As(ident string, as string) string

As suffixed the given column with an alias (`a` AS `b`).

func Asc 

func Asc(column string) string

Asc adds the ASC suffix for the given column.

func Avg 

func Avg(ident string) string

Avg wraps the ident with the AVG aggregation function.

func Count 

func Count(ident string) string

Count wraps the ident with the COUNT aggregation function.

func Desc 

func Desc(column string) string

Desc adds the DESC suffix for the given column.

func Distinct 

func Distinct(idents ...string) string

Distinct prefixed the given columns with the `DISTINCT` keyword (DISTINCT `id`).

func Lower 

func Lower(ident string) string

Lower wraps the given column with the LOWER function. 

P().EQ(sql.Lower("name"), "a8m")

func Max 

func Max(ident string) string

Max wraps the ident with the MAX aggregation function.

func Min 

func Min(ident string) string

Min wraps the ident with the MIN aggregation function.

func ScanInt 

func ScanInt(rows ColumnScanner) (int, error)

ScanInt scans and returns an int from the rows columns.

func ScanInt64 

func ScanInt64(rows ColumnScanner) (int64, error)

ScanInt64 scans and returns an int64 from the rows columns.

func ScanOne 

func ScanOne(rows ColumnScanner, v interface{}) error

ScanOne scans one row to the given value. It fails if the rows holds more than 1 row.

func ScanSlice 

func ScanSlice(rows ColumnScanner, v interface{}) error

ScanSlice scans the given ColumnScanner (basically, sql.Row or sql.Rows) into the given slice.

func ScanString 

func ScanString(rows ColumnScanner) (string, error)

ScanString scans and returns a string from the rows columns.

func ScanValue 

func ScanValue(rows ColumnScanner) (driver.Value, error)

ScanValue scans and returns a driver.Value from the rows columns.

func Sum 

func Sum(ident string) string

Sum wraps the ident with the SUM aggregation function.

Types

type Builder 

type Builder struct {
	bytes.Buffer // underlying buffer.
	// contains filtered or unexported fields
}

Builder is the base query builder for the sql dsl.

func (*Builder) AddError 

func (b *Builder) AddError(err error) *Builder

AddError appends an error to the builder errors.

func (*Builder) Arg 

func (b *Builder) Arg(a interface{}) *Builder

Arg appends an input argument to the builder.

func (*Builder) Args 

func (b *Builder) Args(a ...interface{}) *Builder

Args appends a list of arguments to the builder.

func (*Builder) Comma 

func (b *Builder) Comma() *Builder

Comma adds a comma to the query.

func (Builder) Dialect 

func (b Builder) Dialect() string

Dialect returns the dialect of the builder.

func (*Builder) Err 

func (b *Builder) Err() error

Err returns a concatenated error of all errors encountered during the query-building, or were added manually by calling AddError.

func (*Builder) Ident 

func (b *Builder) Ident(s string) *Builder

Ident appends the given string as an identifier.

func (*Builder) IdentComma 

func (b *Builder) IdentComma(s ...string) *Builder

IdentComma calls Ident on all arguments and adds a comma between them.

func (*Builder) Join 

func (b *Builder) Join(qs ...Querier) *Builder

Join joins a list of Queries to the builder.

func (*Builder) JoinComma 

func (b *Builder) JoinComma(qs ...Querier) *Builder

JoinComma joins a list of Queries and adds comma between them.

func (*Builder) Nested 

func (b *Builder) Nested(f func(*Builder)) *Builder

Nested gets a callback, and wraps its result with parentheses.

func (*Builder) Pad 

func (b *Builder) Pad() *Builder

Pad adds a space to the query.

func (Builder) Query 

func (b Builder) Query() (string, []interface{})

Query implements the Querier interface.

func (*Builder) Quote 

func (b *Builder) Quote(ident string) string

Quote quotes the given identifier with the characters based on the configured dialect. It defaults to "`".

func (*Builder) SetDialect 

func (b *Builder) SetDialect(dialect string)

SetDialect sets the builder dialect. It's used for garnering dialect specific queries.

func (*Builder) SetTotal 

func (b *Builder) SetTotal(total int)

SetTotal sets the value of the total arguments. Used to pass this information between sub queries/expressions.

func (Builder) Total 

func (b Builder) Total() int

Total returns the total number of arguments so far.

func (*Builder) WriteByte 

func (b *Builder) WriteByte(c byte) *Builder

WriteByte wraps the Buffer.WriteByte to make it chainable with other methods.

func (*Builder) WriteOp 

func (b *Builder) WriteOp(op Op) *Builder

WriteOp writes an operator to the builder.

func (*Builder) WriteString 

func (b *Builder) WriteString(s string) *Builder

WriteString wraps the Buffer.WriteString to make it chainable with other methods.

type ColumnBuilder 

type ColumnBuilder struct {
	Builder
	// contains filtered or unexported fields
}

ColumnBuilder is a builder for column definition in table creation.

func Column 

func Column(name string) *ColumnBuilder

Column returns a new ColumnBuilder with the given name. 

sql.Column("group_id").Type("int").Attr("UNIQUE")

func (*ColumnBuilder) Attr 

func (c *ColumnBuilder) Attr(attr string) *ColumnBuilder

Attr sets an extra attribute for the column, like UNIQUE or AUTO_INCREMENT.

func (*ColumnBuilder) Check 

func (c *ColumnBuilder) Check(check func(*Builder)) *ColumnBuilder

Check adds a CHECK clause to the ADD COLUMN statement.

func (*ColumnBuilder) Constraint 

func (c *ColumnBuilder) Constraint(fk *ForeignKeyBuilder) *ColumnBuilder

Constraint adds the CONSTRAINT clause to the ADD COLUMN statement in SQLite.

func (*ColumnBuilder) Query 

func (c *ColumnBuilder) Query() (string, []interface{})

Query returns query representation of a Column.

func (*ColumnBuilder) Type 

func (c *ColumnBuilder) Type(t string) *ColumnBuilder

Type sets the column type.

type ColumnScanner 

type ColumnScanner interface {
	Next() bool
	Scan(...interface{}) error
	Columns() ([]string, error)
	Err() error
}

ColumnScanner is the interface that wraps the four sql.Rows methods used for scanning.

type Conn 

type Conn struct {
	ExecQuerier
}

Conn implements dialect.ExecQuerier given ExecQuerier.

func (Conn) Exec 

func (c Conn) Exec(ctx context.Context, query string, args, v interface{}) error

Exec implements the dialect.Exec method.

func (Conn) Query 

func (c Conn) Query(ctx context.Context, query string, args, v interface{}) error

Query implements the dialect.Query method.

type DeleteBuilder 

type DeleteBuilder struct {
	Builder
	// contains filtered or unexported fields
}

DeleteBuilder is a builder for `DELETE` statement.

func Delete 

func Delete(table string) *DeleteBuilder

Delete creates a builder for the `DELETE` statement. 

Delete("users").
	Where(
		Or(
			EQ("name", "foo").And().EQ("age", 10),
			EQ("name", "bar").And().EQ("age", 20),
			And(
				EQ("name", "qux"),
				EQ("age", 1).Or().EQ("age", 2),
			),
		),
	)

func (*DeleteBuilder) FromSelect 

func (d *DeleteBuilder) FromSelect(s *Selector) *DeleteBuilder

FromSelect makes it possible to delete a sub query.

func (*DeleteBuilder) Query 

func (d *DeleteBuilder) Query() (string, []interface{})

Query returns query representation of a `DELETE` statement.

func (*DeleteBuilder) Schema 

func (d *DeleteBuilder) Schema(name string) *DeleteBuilder

Schema sets the database name for the table whose row will be deleted.

func (*DeleteBuilder) Where 

func (d *DeleteBuilder) Where(p *Predicate) *DeleteBuilder

Where appends a where predicate to the `DELETE` statement.

type DescribeBuilder 

type DescribeBuilder struct {
	Builder
	// contains filtered or unexported fields
}

DescribeBuilder is a query builder for `DESCRIBE` statement.

func Describe 

func Describe(name string) *DescribeBuilder

Describe returns a query builder for the `DESCRIBE` statement. 

Describe("users")

func (*DescribeBuilder) Query 

func (t *DescribeBuilder) Query() (string, []interface{})

Query returns query representation of a `DESCRIBE` statement.

type DialectBuilder 

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

DialectBuilder prefixes all root builders with the `Dialect` constructor.

func Dialect 

func Dialect(name string) *DialectBuilder

Dialect creates a new DialectBuilder with the given dialect name.

func (*DialectBuilder) AlterIndex 

func (d *DialectBuilder) AlterIndex(name string) *IndexAlter

AlterIndex creates an IndexAlter for the configured dialect. 

Dialect(dialect.Postgres).
	AlterIndex("old").
	Rename("new")

func (*DialectBuilder) AlterTable 

func (d *DialectBuilder) AlterTable(name string) *TableAlter

AlterTable creates a TableAlter for the configured dialect. 

Dialect(dialect.Postgres).
	AlterTable("users").
	AddColumn(Column("group_id").Type("int").Attr("UNIQUE")).
	AddForeignKey(ForeignKey().Columns("group_id").
		Reference(Reference().Table("groups").Columns("id")).
		OnDelete("CASCADE"),
	)

func (*DialectBuilder) Column 

func (d *DialectBuilder) Column(name string) *ColumnBuilder

Column creates a ColumnBuilder for the configured dialect. 

Dialect(dialect.Postgres)..
	Column("group_id").Type("int").Attr("UNIQUE")

func (*DialectBuilder) CreateIndex 

func (d *DialectBuilder) CreateIndex(name string) *IndexBuilder

CreateIndex creates a IndexBuilder for the configured dialect. 

Dialect(dialect.Postgres).
	CreateIndex("unique_name").
	Unique().
	Table("users").
	Columns("first", "last")

func (*DialectBuilder) CreateTable 

func (d *DialectBuilder) CreateTable(name string) *TableBuilder

CreateTable creates a TableBuilder for the configured dialect. 

Dialect(dialect.Postgres).
	CreateTable("users").
		Columns(
			Column("id").Type("int").Attr("auto_increment"),
			Column("name").Type("varchar(255)"),
		).
		PrimaryKey("id")

func (*DialectBuilder) Delete 

func (d *DialectBuilder) Delete(table string) *DeleteBuilder

Delete creates a DeleteBuilder for the configured dialect. 

Dialect(dialect.Postgres).
	Delete().From("users")

func (*DialectBuilder) Describe 

func (d *DialectBuilder) Describe(name string) *DescribeBuilder

Describe creates a DescribeBuilder for the configured dialect. 

Dialect(dialect.Postgres).
	Describe("users")

func (*DialectBuilder) DropIndex 

func (d *DialectBuilder) DropIndex(name string) *DropIndexBuilder

DropIndex creates a DropIndexBuilder for the configured dialect. 

Dialect(dialect.Postgres).
	DropIndex("name")

func (*DialectBuilder) Insert 

func (d *DialectBuilder) Insert(table string) *InsertBuilder

Insert creates a InsertBuilder for the configured dialect. 

Dialect(dialect.Postgres).
	Insert("users").Columns("age").Values(1)

func (*DialectBuilder) Select 

func (d *DialectBuilder) Select(columns ...string) *Selector

Select creates a Selector for the configured dialect. 

Dialect(dialect.Postgres).
	Select().From(Table("users"))

func (*DialectBuilder) Table 

func (d *DialectBuilder) Table(name string) *SelectTable

Table creates a SelectTable for the configured dialect. 

Dialect(dialect.Postgres).
	Table("users").As("u")

func (*DialectBuilder) Update 

func (d *DialectBuilder) Update(table string) *UpdateBuilder

Update creates a UpdateBuilder for the configured dialect. 

Dialect(dialect.Postgres).
	Update("users").Set("name", "foo")

func (*DialectBuilder) With 

func (d *DialectBuilder) With(name string) *WithBuilder

With creates a WithBuilder for the configured dialect. 

Dialect(dialect.Postgres).
	With("users_view").
	As(Select().From(Table("users")))

type Driver 

type Driver struct {
	Conn
	// contains filtered or unexported fields
}

Driver is a dialect.Driver implementation for SQL based databases.

func Open 

func Open(driver, source string) (*Driver, error)

Open wraps the database/sql.Open method and returns a dialect.Driver that implements the an ent/dialect.Driver interface.

func OpenDB 

func OpenDB(driver string, db *sql.DB) *Driver

OpenDB wraps the given database/sql.DB method with a Driver.

func (*Driver) BeginTx 

func (d *Driver) BeginTx(ctx context.Context, opts *TxOptions) (dialect.Tx, error)

BeginTx starts a transaction with options.

func (*Driver) Close 

func (d *Driver) Close() error

Close closes the underlying connection.

func (Driver) DB 

func (d Driver) DB() *sql.DB

DB returns the underlying *sql.DB instance.

func (Driver) Dialect 

func (d Driver) Dialect() string

Dialect implements the dialect.Dialect method.

func (*Driver) Tx 

func (d *Driver) Tx(ctx context.Context) (dialect.Tx, error)

Tx starts and returns a transaction.

type DropIndexBuilder 

type DropIndexBuilder struct {
	Builder
	// contains filtered or unexported fields
}

DropIndexBuilder is a builder for `DROP INDEX` statement.

func DropIndex 

func DropIndex(name string) *DropIndexBuilder

DropIndex creates a builder for the `DROP INDEX` statement. 

MySQL:

	DropIndex("index_name").
		Table("users").

SQLite/PostgreSQL:

	DropIndex("index_name")

func (*DropIndexBuilder) Query 

func (d *DropIndexBuilder) Query() (string, []interface{})

Query returns query representation of a reference clause. 

DROP INDEX index_name [ON table_name]

func (*DropIndexBuilder) Table 

func (d *DropIndexBuilder) Table(table string) *DropIndexBuilder

Table defines the table for the index.

type ExecQuerier 

type ExecQuerier interface {
	ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
	QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
}

ExecQuerier wraps the standard Exec and Query methods.

type ForeignKeyBuilder 

type ForeignKeyBuilder struct {
	Builder
	// contains filtered or unexported fields
}

ForeignKeyBuilder is the builder for the foreign-key constraint clause.

func ForeignKey 

func ForeignKey(symbol ...string) *ForeignKeyBuilder

ForeignKey returns a builder for the foreign-key constraint clause in create/alter table statements. 

ForeignKey().
	Columns("group_id").
	Reference(Reference().Table("groups").Columns("id")).
	OnDelete("CASCADE")

func (*ForeignKeyBuilder) Columns 

func (fk *ForeignKeyBuilder) Columns(s ...string) *ForeignKeyBuilder

Columns sets the columns of the foreign key in the source table.

func (*ForeignKeyBuilder) OnDelete 

func (fk *ForeignKeyBuilder) OnDelete(action string) *ForeignKeyBuilder

OnDelete sets the on delete action for this constraint.

func (*ForeignKeyBuilder) OnUpdate 

func (fk *ForeignKeyBuilder) OnUpdate(action string) *ForeignKeyBuilder

OnUpdate sets the on delete action for this constraint.

func (*ForeignKeyBuilder) Query 

func (fk *ForeignKeyBuilder) Query() (string, []interface{})

Query returns query representation of a foreign key constraint.

func (*ForeignKeyBuilder) Reference 

func (fk *ForeignKeyBuilder) Reference(r *ReferenceBuilder) *ForeignKeyBuilder

Reference sets the reference clause.

func (*ForeignKeyBuilder) Symbol 

func (fk *ForeignKeyBuilder) Symbol(s string) *ForeignKeyBuilder

Symbol sets the symbol of the foreign key.

type Func 

type Func struct {
	Builder
	// contains filtered or unexported fields
}

Func represents an SQL function.

func (*Func) Append 

func (f *Func) Append(fn func(*Builder)) *Func

Append appends a new function to the function callbacks. The callback list are executed on call to String.

func (*Func) Avg 

func (f *Func) Avg(ident string)

Avg wraps the ident with the AVG aggregation function.

func (*Func) Count 

func (f *Func) Count(ident string)

Count wraps the ident with the COUNT aggregation function.

func (*Func) Lower 

func (f *Func) Lower(ident string)

Lower wraps the given ident with the LOWER function.

func (*Func) Max 

func (f *Func) Max(ident string)

Max wraps the ident with the MAX aggregation function.

func (*Func) Min 

func (f *Func) Min(ident string)

Min wraps the ident with the MIN aggregation function.

func (*Func) String 

func (f *Func) String() string

String implements the fmt.Stringer.

func (*Func) Sum 

func (f *Func) Sum(ident string)

Sum wraps the ident with the SUM aggregation function.

type IndexAlter 

type IndexAlter struct {
	Builder

	Queries []Querier // alter options.
	// contains filtered or unexported fields
}

IndexAlter is a query builder for `ALTER INDEX` statement.

func AlterIndex 

func AlterIndex(name string) *IndexAlter

AlterIndex returns a query builder for the `ALTER INDEX` statement. 

AlterIndex("old_key").
	Rename("new_key")

func (*IndexAlter) Query 

func (i *IndexAlter) Query() (string, []interface{})

Query returns query representation of the `ALTER INDEX` statement. 

ALTER INDEX name
	[alter_specification]

func (*IndexAlter) Rename 

func (i *IndexAlter) Rename(name string) *IndexAlter

Rename appends the `RENAME TO` clause to the `ALTER INDEX` statement.

type IndexBuilder 

type IndexBuilder struct {
	Builder
	// contains filtered or unexported fields
}

IndexBuilder is a builder for `CREATE INDEX` statement.

func CreateIndex 

func CreateIndex(name string) *IndexBuilder

CreateIndex creates a builder for the `CREATE INDEX` statement. 

CreateIndex("index_name").
	Unique().
	Table("users").
	Column("name")

Or: 

CreateIndex("index_name").
	Unique().
	Table("users").
	Columns("name", "age")

func (*IndexBuilder) Column 

func (i *IndexBuilder) Column(column string) *IndexBuilder

Column appends a column to the column list for the index.

func (*IndexBuilder) Columns 

func (i *IndexBuilder) Columns(columns ...string) *IndexBuilder

Columns appends the given columns to the column list for the index.

func (*IndexBuilder) Query 

func (i *IndexBuilder) Query() (string, []interface{})

Query returns query representation of a reference clause.

func (*IndexBuilder) Table 

func (i *IndexBuilder) Table(table string) *IndexBuilder

Table defines the table for the index.

func (*IndexBuilder) Unique 

func (i *IndexBuilder) Unique() *IndexBuilder

Unique sets the index to be a unique index.

type InsertBuilder 

type InsertBuilder struct {
	Builder
	// contains filtered or unexported fields
}

InsertBuilder is a builder for `INSERT INTO` statement.

func Insert 

func Insert(table string) *InsertBuilder

Insert creates a builder for the `INSERT INTO` statement. 

Insert("users").
	Columns("name", "age").
	Values("a8m", 10).
	Values("foo", 20)

Note: Insert inserts all values in one batch.

func (*InsertBuilder) Columns 

func (i *InsertBuilder) Columns(columns ...string) *InsertBuilder

Columns sets the columns of the insert statement.

func (*InsertBuilder) Default 

func (i *InsertBuilder) Default() *InsertBuilder

Default sets the default values clause based on the dialect type.

func (*InsertBuilder) Query 

func (i *InsertBuilder) Query() (string, []interface{})

Query returns query representation of an `INSERT INTO` statement.

func (*InsertBuilder) Returning 

func (i *InsertBuilder) Returning(columns ...string) *InsertBuilder

Returning adds the `RETURNING` clause to the insert statement. PostgreSQL only.

func (*InsertBuilder) Schema 

func (i *InsertBuilder) Schema(name string) *InsertBuilder

Schema sets the database name for the insert table.

func (*InsertBuilder) Set 

func (i *InsertBuilder) Set(column string, v interface{}) *InsertBuilder

Set is a syntactic sugar API for inserting only one row.

func (*InsertBuilder) Values 

func (i *InsertBuilder) Values(values ...interface{}) *InsertBuilder

Values append a value tuple for the insert statement.

type NullBool 

type NullBool = sql.NullBool

NullBool is an alias to sql.NullBool.

type NullFloat64 

type NullFloat64 = sql.NullFloat64

NullFloat64 is an alias to sql.NullFloat64.

type NullInt64 

type NullInt64 = sql.NullInt64

NullInt64 is an alias to sql.NullInt64.

type NullString 

type NullString = sql.NullString

NullString is an alias to sql.NullString.

type NullTime 

type NullTime = sql.NullTime

NullTime represents a time.Time that may be null.

type Op 

type Op int

An Op represents a predicate operator. 

const (
	OpEQ      Op = iota // logical and.
	OpNEQ               // <>
	OpGT                // >
	OpGTE               // >=
	OpLT                // <
	OpLTE               // <=
	OpIn                // IN
	OpNotIn             // NOT IN
	OpLike              // LIKE
	OpIsNull            // IS NULL
	OpNotNull           // IS NOT NULL
)

Predicate operators

type ParamFormatter added in v0.7.0 

type ParamFormatter interface {
	// The FormatParam function lets users to define
	// custom placeholder formatting for their types.
	// For example, formatting the default placeholder
	// from '?' to 'ST_GeomFromWKB(?)' for MySQL dialect.
	FormatParam(placeholder string, info *StmtInfo) string
}

ParamFormatter wraps the FormatPram function.

type Predicate 

type Predicate struct {
	Builder
	// contains filtered or unexported fields
}

Predicate is a where predicate.

func And 

func And(preds ...*Predicate) *Predicate

And combines all given predicates with AND between them.

func CompositeGT 

func CompositeGT(columns []string, args ...interface{}) *Predicate

CompositeGT returns a comiposite ">" predicate

func CompositeLT 

func CompositeLT(columns []string, args ...interface{}) *Predicate

CompositeLT returns a comiposite "<" predicate

func Contains 

func Contains(col, sub string) *Predicate

Contains is a helper predicate that checks substring using the LIKE predicate.

func ContainsFold 

func ContainsFold(col, sub string) *Predicate

ContainsFold is a helper predicate that checks substring using the LIKE predicate.

func EQ 

func EQ(col string, value interface{}) *Predicate

EQ returns a "=" predicate.

func EqualFold 

func EqualFold(col, sub string) *Predicate

EqualFold is a helper predicate that applies the "=" predicate with case-folding.

func ExprP added in v0.7.0 

func ExprP(exr string, args ...interface{}) *Predicate

ExprP creates a new predicate from the given expression. 

ExprP("A = ? AND B > ?", args...)

func False 

func False() *Predicate

False appends the FALSE keyword to the predicate. 

Delete().From("users").Where(False())

func GT 

func GT(col string, value interface{}) *Predicate

GT returns a ">" predicate.

func GTE 

func GTE(col string, value interface{}) *Predicate

GTE returns a ">=" predicate.

func HasPrefix 

func HasPrefix(col, prefix string) *Predicate

HasPrefix is a helper predicate that checks prefix using the LIKE predicate.

func HasSuffix 

func HasSuffix(col, suffix string) *Predicate

HasSuffix is a helper predicate that checks suffix using the LIKE predicate.

func In 

func In(col string, args ...interface{}) *Predicate

In returns the `IN` predicate.

func InInts 

func InInts(col string, args ...int) *Predicate

InInts returns the `IN` predicate for ints.

func InValues 

func InValues(col string, args ...driver.Value) *Predicate

InValues adds the `IN` predicate for slice of driver.Value.

func IsNull 

func IsNull(col string) *Predicate

IsNull returns the `IS NULL` predicate.

func LT 

func LT(col string, value interface{}) *Predicate

LT returns a "<" predicate.

func LTE 

func LTE(col string, value interface{}) *Predicate

LTE returns a "<=" predicate.

func Like 

func Like(col, pattern string) *Predicate

Like returns the `LIKE` predicate.

func NEQ 

func NEQ(col string, value interface{}) *Predicate

NEQ returns a "<>" predicate.

func Not 

func Not(pred *Predicate) *Predicate

Not wraps the given predicate with the not predicate. 

Not(Or(EQ("name", "foo"), EQ("name", "bar")))

func NotIn 

func NotIn(col string, args ...interface{}) *Predicate

NotIn returns the `Not IN` predicate.

func NotNull 

func NotNull(col string) *Predicate

NotNull returns the `IS NOT NULL` predicate.

func Or 

func Or(preds ...*Predicate) *Predicate

Or combines all given predicates with OR between them. 

Or(EQ("name", "foo"), EQ("name", "bar"))

func P 

func P(fns ...func(*Builder)) *Predicate

P creates a new predicate. 

P().EQ("name", "a8m").And().EQ("age", 30)

func (*Predicate) Append 

func (p *Predicate) Append(f func(*Builder)) *Predicate

Append appends a new function to the predicate callbacks. The callback list are executed on call to Query.

func (*Predicate) CompositeGT 

func (p *Predicate) CompositeGT(columns []string, args ...interface{}) *Predicate

CompositeGT returns a composite ">" predicate.

func (*Predicate) CompositeLT 

func (p *Predicate) CompositeLT(columns []string, args ...interface{}) *Predicate

CompositeLT appends a composite "<" predicate.

func (*Predicate) Contains 

func (p *Predicate) Contains(col, sub string) *Predicate

Contains is a helper predicate that checks substring using the LIKE predicate.

func (*Predicate) ContainsFold 

func (p *Predicate) ContainsFold(col, sub string) *Predicate

ContainsFold is a helper predicate that applies the LIKE predicate with case-folding.

func (*Predicate) EQ 

func (p *Predicate) EQ(col string, arg interface{}) *Predicate

EQ appends a "=" predicate.

func (*Predicate) EqualFold 

func (p *Predicate) EqualFold(col, sub string) *Predicate

EqualFold is a helper predicate that applies the "=" predicate with case-folding.

func (*Predicate) False 

func (p *Predicate) False() *Predicate

False appends FALSE to the predicate.

func (*Predicate) GT 

func (p *Predicate) GT(col string, arg interface{}) *Predicate

GT appends a ">" predicate.

func (*Predicate) GTE 

func (p *Predicate) GTE(col string, arg interface{}) *Predicate

GTE appends a ">=" predicate.

func (*Predicate) HasPrefix 

func (p *Predicate) HasPrefix(col, prefix string) *Predicate

HasPrefix is a helper predicate that checks prefix using the LIKE predicate.

func (*Predicate) HasSuffix 

func (p *Predicate) HasSuffix(col, suffix string) *Predicate

HasSuffix is a helper predicate that checks suffix using the LIKE predicate.

func (*Predicate) In 

func (p *Predicate) In(col string, args ...interface{}) *Predicate

In appends the `IN` predicate.

func (*Predicate) InInts 

func (p *Predicate) InInts(col string, args ...int) *Predicate

InInts adds the `IN` predicate for ints.

func (*Predicate) InValues 

func (p *Predicate) InValues(col string, args ...driver.Value) *Predicate

InValues adds the `IN` predicate for slice of driver.Value.

func (*Predicate) IsNull 

func (p *Predicate) IsNull(col string) *Predicate

IsNull appends the `IS NULL` predicate.

func (*Predicate) LT 

func (p *Predicate) LT(col string, arg interface{}) *Predicate

LT appends a "<" predicate.

func (*Predicate) LTE 

func (p *Predicate) LTE(col string, arg interface{}) *Predicate

LTE appends a "<=" predicate.

func (*Predicate) Like 

func (p *Predicate) Like(col, pattern string) *Predicate

Like appends the `LIKE` predicate.

func (*Predicate) NEQ 

func (p *Predicate) NEQ(col string, arg interface{}) *Predicate

NEQ appends a "<>" predicate.

func (*Predicate) Not 

func (p *Predicate) Not() *Predicate

Not appends NOT to the predicate.

func (*Predicate) NotIn 

func (p *Predicate) NotIn(col string, args ...interface{}) *Predicate

NotIn appends the `Not IN` predicate.

func (*Predicate) NotNull 

func (p *Predicate) NotNull(col string) *Predicate

NotNull appends the `IS NOT NULL` predicate.

func (*Predicate) Query 

func (p *Predicate) Query() (string, []interface{})

Query returns query representation of a predicate.

type Querier 

type Querier interface {
	// Query returns the query representation of the element
	// and its arguments (if any).
	Query() (string, []interface{})
}

Querier wraps the basic Query method that is implemented by the different builders in this file.

func Expr 

func Expr(exr string, args ...interface{}) Querier

Expr returns an SQL expression that implements the Querier interface.

func Raw 

func Raw(s string) Querier

Raw returns a raw SQL query that is placed as-is in the query.

type Queries 

type Queries []Querier

Queries are list of queries join with space between them.

func (Queries) Query 

func (n Queries) Query() (string, []interface{})

Query returns query representation of Queriers.

type ReferenceBuilder 

type ReferenceBuilder struct {
	Builder
	// contains filtered or unexported fields
}

ReferenceBuilder is a builder for the reference clause in constraints. For example, in foreign key creation.

func Reference 

func Reference() *ReferenceBuilder

Reference create a reference builder for the reference_option clause. 

Reference().Table("groups").Columns("id")

func (*ReferenceBuilder) Columns 

func (r *ReferenceBuilder) Columns(s ...string) *ReferenceBuilder

Columns sets the columns of the referenced table.

func (*ReferenceBuilder) Query 

func (r *ReferenceBuilder) Query() (string, []interface{})

Query returns query representation of a reference clause.

func (*ReferenceBuilder) Table 

func (r *ReferenceBuilder) Table(s string) *ReferenceBuilder

Table sets the referenced table.

type Result 

type Result = sql.Result

Result is an alias to sql.Result.

type Rows 

type Rows struct{ *sql.Rows }

Rows wraps the sql.Rows to avoid locks copy.

type SelectTable 

type SelectTable struct {
	Builder
	// contains filtered or unexported fields
}

SelectTable is a table selector.

func Table 

func Table(name string) *SelectTable

Table returns a new table selector. 

t1 := Table("users").As("u")
return Select(t1.C("name"))

func (*SelectTable) As 

func (s *SelectTable) As(alias string) *SelectTable

As adds the AS clause to the table selector.

func (*SelectTable) C 

func (s *SelectTable) C(column string) string

C returns a formatted string for the table column.

func (*SelectTable) Columns 

func (s *SelectTable) Columns(columns ...string) []string

Columns returns a list of formatted strings for the table columns.

func (*SelectTable) Schema 

func (s *SelectTable) Schema(name string) *SelectTable

Schema sets the schema name of the table.

func (*SelectTable) Unquote 

func (s *SelectTable) Unquote() *SelectTable

Unquote makes the table name to be formatted as raw string (unquoted). It is useful whe you don't want to query tables under the current database. For example: "INFORMATION_SCHEMA.TABLE_CONSTRAINTS" in MySQL.

type Selector 

type Selector struct {
	Builder
	// contains filtered or unexported fields
}

Selector is a builder for the `SELECT` statement.

func Select 

func Select(columns ...string) *Selector

Select returns a new selector for the `SELECT` statement. 

t1 := Table("users").As("u")
t2 := Select().From(Table("groups")).Where(EQ("user_id", 10)).As("g")
return Select(t1.C("id"), t2.C("name")).
		From(t1).
		Join(t2).
		On(t1.C("id"), t2.C("user_id"))

func (*Selector) As 

func (s *Selector) As(alias string) *Selector

As give this selection an alias.

func (*Selector) C 

func (s *Selector) C(column string) string

C returns a formatted string for a selected column from this statement.

func (*Selector) Clone 

func (s *Selector) Clone() *Selector

Clone returns a duplicate of the selector, including all associated steps. It can be used to prepare common SELECT statements and use them differently after the clone is made.

func (*Selector) Columns 

func (s *Selector) Columns(columns ...string) []string

Columns returns a list of formatted strings for a selected columns from this statement.

func (*Selector) Context 

func (s *Selector) Context() context.Context

Context returns the Selector context or Background if nil.

func (*Selector) Count 

func (s *Selector) Count(columns ...string) *Selector

Count sets the Select statement to be a `SELECT COUNT(*)`.

func (*Selector) Distinct 

func (s *Selector) Distinct() *Selector

Distinct adds the DISTINCT keyword to the `SELECT` statement.

func (*Selector) From 

func (s *Selector) From(t TableView) *Selector

From sets the source of `FROM` clause.

func (*Selector) FromSelect 

func (s *Selector) FromSelect(s2 *Selector) *Selector

FromSelect copies the predicate from a selector.

func (*Selector) GroupBy 

func (s *Selector) GroupBy(columns ...string) *Selector

GroupBy appends the `GROUP BY` clause to the `SELECT` statement.

func (*Selector) Having 

func (s *Selector) Having(p *Predicate) *Selector

Having appends a predicate for the `HAVING` clause.

func (*Selector) Join 

func (s *Selector) Join(t TableView) *Selector

Join appends a `JOIN` clause to the statement.

func (*Selector) LeftJoin 

func (s *Selector) LeftJoin(t TableView) *Selector

LeftJoin appends a `LEFT JOIN` clause to the statement.

func (*Selector) Limit 

func (s *Selector) Limit(limit int) *Selector

Limit adds the `LIMIT` clause to the `SELECT` statement.

func (*Selector) Not 

func (s *Selector) Not() *Selector

Not sets the next coming predicate with not.

func (*Selector) Offset 

func (s *Selector) Offset(offset int) *Selector

Offset adds the `OFFSET` clause to the `SELECT` statement.

func (*Selector) On 

func (s *Selector) On(c1, c2 string) *Selector

On sets the `ON` clause for the `JOIN` operation.

func (*Selector) OnP 

func (s *Selector) OnP(p *Predicate) *Selector

OnP sets or appends the given predicate for the `ON` clause of the statement.

func (*Selector) Or 

func (s *Selector) Or() *Selector

Or sets the next coming predicate with OR operator (disjunction).

func (*Selector) OrderBy 

func (s *Selector) OrderBy(columns ...string) *Selector

OrderBy appends the `ORDER BY` clause to the `SELECT` statement.

func (*Selector) OrderExpr 

func (s *Selector) OrderExpr(exprs ...Querier) *Selector

OrderExpr appends the `ORDER BY` clause to the `SELECT` statement with custom list of expressions.

func (*Selector) P 

func (s *Selector) P() *Predicate

P returns the predicate of a selector.

func (*Selector) Query 

func (s *Selector) Query() (string, []interface{})

Query returns query representation of a `SELECT` statement.

func (*Selector) RightJoin 

func (s *Selector) RightJoin(t TableView) *Selector

RightJoin appends a `RIGHT JOIN` clause to the statement.

func (*Selector) Select 

func (s *Selector) Select(columns ...string) *Selector

Select changes the columns selection of the SELECT statement. Empty selection means all columns *.

func (*Selector) SetDistinct 

func (s *Selector) SetDistinct(v bool) *Selector

SetDistinct sets explicitly if the returned rows are distinct or indistinct.

func (*Selector) SetP 

func (s *Selector) SetP(p *Predicate) *Selector

SetP sets explicitly the predicate function for the selector and clear its previous state.

func (*Selector) Table 

func (s *Selector) Table() *SelectTable

Table returns the selected table.

func (*Selector) Where 

func (s *Selector) Where(p *Predicate) *Selector

Where sets or appends the given predicate to the statement.

func (*Selector) WithContext 

func (s *Selector) WithContext(ctx context.Context) *Selector

WithContext sets the context into the *Selector.

type StmtInfo added in v0.7.0 

type StmtInfo struct {
	// The Dialect of the SQL driver.
	Dialect string
}

StmtInfo holds an information regarding the statement

type TableAlter 

type TableAlter struct {
	Builder

	Queries []Querier // columns and foreign-keys to add.
	// contains filtered or unexported fields
}

TableAlter is a query builder for `ALTER TABLE` statement.

func AlterTable 

func AlterTable(name string) *TableAlter

AlterTable returns a query builder for the `ALTER TABLE` statement. 

AlterTable("users").
	AddColumn(Column("group_id").Type("int").Attr("UNIQUE")).
	AddForeignKey(ForeignKey().Columns("group_id").
		Reference(Reference().Table("groups").Columns("id")).OnDelete("CASCADE")),
	)

func (*TableAlter) AddColumn 

func (t *TableAlter) AddColumn(c *ColumnBuilder) *TableAlter

AddColumn appends the `ADD COLUMN` clause to the given `ALTER TABLE` statement.

func (*TableAlter) AddForeignKey 

func (t *TableAlter) AddForeignKey(fk *ForeignKeyBuilder) *TableAlter

AddForeignKey adds a foreign key constraint to the `ALTER TABLE` statement.

func (*TableAlter) AddIndex 

func (t *TableAlter) AddIndex(idx *IndexBuilder) *TableAlter

AddIndex appends the `ADD INDEX` clause to the given `ALTER TABLE` statement.

func (*TableAlter) ChangeColumn 

func (t *TableAlter) ChangeColumn(name string, c *ColumnBuilder) *TableAlter

ChangeColumn appends the `CHANGE COLUMN` clause to the given `ALTER TABLE` statement.

func (*TableAlter) DropColumn 

func (t *TableAlter) DropColumn(c *ColumnBuilder) *TableAlter

DropColumn appends the `DROP COLUMN` clause to the given `ALTER TABLE` statement.

func (*TableAlter) DropConstraint 

func (t *TableAlter) DropConstraint(ident string) *TableAlter

DropConstraint appends the `DROP CONSTRAINT` clause to the given `ALTER TABLE` statement.

func (*TableAlter) DropForeignKey 

func (t *TableAlter) DropForeignKey(ident string) *TableAlter

DropForeignKey appends the `DROP FOREIGN KEY` clause to the given `ALTER TABLE` statement.

func (*TableAlter) DropIndex 

func (t *TableAlter) DropIndex(name string) *TableAlter

DropIndex appends the `DROP INDEX` clause to the given `ALTER TABLE` statement.

func (*TableAlter) ModifyColumn 

func (t *TableAlter) ModifyColumn(c *ColumnBuilder) *TableAlter

ModifyColumn appends the `MODIFY/ALTER COLUMN` clause to the given `ALTER TABLE` statement.

func (*TableAlter) ModifyColumns 

func (t *TableAlter) ModifyColumns(cs ...*ColumnBuilder) *TableAlter

ModifyColumns calls ModifyColumn with each of the given builders.

func (*TableAlter) Query 

func (t *TableAlter) Query() (string, []interface{})

Query returns query representation of the `ALTER TABLE` statement. 

ALTER TABLE name
	[alter_specification]

func (*TableAlter) RenameColumn 

func (t *TableAlter) RenameColumn(old, new string) *TableAlter

RenameColumn appends the `RENAME COLUMN` clause to the given `ALTER TABLE` statement.

func (*TableAlter) RenameIndex 

func (t *TableAlter) RenameIndex(curr, new string) *TableAlter

RenameIndex appends the `RENAME INDEX` clause to the given `ALTER TABLE` statement.

type TableBuilder 

type TableBuilder struct {
	Builder
	// contains filtered or unexported fields
}

TableBuilder is a query builder for `CREATE TABLE` statement.

func CreateTable 

func CreateTable(name string) *TableBuilder

CreateTable returns a query builder for the `CREATE TABLE` statement. 

CreateTable("users").
	Columns(
		Column("id").Type("int").Attr("auto_increment"),
		Column("name").Type("varchar(255)"),
	).
	PrimaryKey("id")

func (*TableBuilder) Charset 

func (t *TableBuilder) Charset(s string) *TableBuilder

Charset appends the `CHARACTER SET` clause to the statement. MySQL only.

func (*TableBuilder) Collate 

func (t *TableBuilder) Collate(s string) *TableBuilder

Collate appends the `COLLATE` clause to the statement. MySQL only.

func (*TableBuilder) Column 

func (t *TableBuilder) Column(c *ColumnBuilder) *TableBuilder

Column appends the given column to the `CREATE TABLE` statement.

func (*TableBuilder) Columns 

func (t *TableBuilder) Columns(columns ...*ColumnBuilder) *TableBuilder

Columns appends the a list of columns to the builder.

func (*TableBuilder) Constraints 

func (t *TableBuilder) Constraints(fks ...*ForeignKeyBuilder) *TableBuilder

Constraints adds a list of foreign-key constraints to the statement.

func (*TableBuilder) ForeignKeys 

func (t *TableBuilder) ForeignKeys(fks ...*ForeignKeyBuilder) *TableBuilder

ForeignKeys adds a list of foreign-keys to the statement (without constraints).

func (*TableBuilder) IfNotExists 

func (t *TableBuilder) IfNotExists() *TableBuilder

IfNotExists appends the `IF NOT EXISTS` clause to the `CREATE TABLE` statement.

func (*TableBuilder) Options 

func (t *TableBuilder) Options(s string) *TableBuilder

Options appends additional options to to the statement (MySQL only).

func (*TableBuilder) PrimaryKey 

func (t *TableBuilder) PrimaryKey(column ...string) *TableBuilder

PrimaryKey adds a column to the primary-key constraint in the statement.

func (*TableBuilder) Query 

func (t *TableBuilder) Query() (string, []interface{})

Query returns query representation of a `CREATE TABLE` statement.

CREATE TABLE [IF NOT EXISTS] name 

(table definition)
[charset and collation]

type TableView 

type TableView interface {
	// contains filtered or unexported methods
}

TableView is a view that returns a table view. Can ne a Table, Selector or a View (WITH statement).

type Tx 

type Tx struct {
	dialect.ExecQuerier
	driver.Tx
}

Tx implements dialect.Tx interface.

type TxOptions 

type TxOptions = sql.TxOptions

TxOptions holds the transaction options to be used in DB.BeginTx.

type UpdateBuilder 

type UpdateBuilder struct {
	Builder
	// contains filtered or unexported fields
}

UpdateBuilder is a builder for `UPDATE` statement.

func Update 

func Update(table string) *UpdateBuilder

Update creates a builder for the `UPDATE` statement. 

Update("users").Set("name", "foo").Set("age", 10)

func (*UpdateBuilder) Add 

func (u *UpdateBuilder) Add(column string, v interface{}) *UpdateBuilder

Add adds a numeric value to the given column.

func (*UpdateBuilder) Empty 

func (u *UpdateBuilder) Empty() bool

Empty reports whether this builder does not contain update changes.

func (*UpdateBuilder) FromSelect 

func (u *UpdateBuilder) FromSelect(s *Selector) *UpdateBuilder

FromSelect makes it possible to update entities that match the sub-query.

func (*UpdateBuilder) Query 

func (u *UpdateBuilder) Query() (string, []interface{})

Query returns query representation of an `UPDATE` statement.

func (*UpdateBuilder) Schema 

func (u *UpdateBuilder) Schema(name string) *UpdateBuilder

Schema sets the database name for the updated table.

func (*UpdateBuilder) Set 

func (u *UpdateBuilder) Set(column string, v interface{}) *UpdateBuilder

Set sets a column and a its value.

func (*UpdateBuilder) SetNull 

func (u *UpdateBuilder) SetNull(column string) *UpdateBuilder

SetNull sets a column as null value.

func (*UpdateBuilder) Where 

func (u *UpdateBuilder) Where(p *Predicate) *UpdateBuilder

Where adds a where predicate for update statement.

type WithBuilder 

type WithBuilder struct {
	Builder
	// contains filtered or unexported fields
}

WithBuilder is the builder for the `WITH` statement.

func With 

func With(name string) *WithBuilder

With returns a new builder for the `WITH` statement. 

n := Queries{With("users_view").As(Select().From(Table("users"))), Select().From(Table("users_view"))}
return n.Query()

func (*WithBuilder) As 

func (w *WithBuilder) As(s *Selector) *WithBuilder

As sets the view sub query.

func (*WithBuilder) Name 

func (w *WithBuilder) Name() string

Name returns the name of the view.

func (*WithBuilder) Query 

func (w *WithBuilder) Query() (string, []interface{})

Query returns query representation of a `WITH` clause.

type Wrapper 

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

Wrapper wraps a given Querier with different format. Used to prefix/suffix other queries.

func (*Wrapper) Dialect 

func (w *Wrapper) Dialect() string

Dialect calls Dialect on the wrapped query.

func (*Wrapper) Query 

func (w *Wrapper) Query() (string, []interface{})

Query returns query representation of a wrapped Querier.

func (*Wrapper) SetDialect 

func (w *Wrapper) SetDialect(name string)

SetDialect calls SetDialect on the wrapped query.

func (*Wrapper) SetTotal 

func (w *Wrapper) SetTotal(total int)

SetTotal sets the value of the total arguments. Used to pass this information between sub queries/expressions.

func (*Wrapper) Total 

func (w *Wrapper) Total() int

Total returns the total number of arguments so far.

Source Files

View all Source files

Directories

Path Synopsis
Package schema contains all schema migration logic for SQL dialects.
 Package schema contains all schema migration logic for SQL dialects.
Package sqlgraph provides graph abstraction capabilities on top of sql-based databases for ent codegen.
 Package sqlgraph provides graph abstraction capabilities on top of sql-based databases for ent codegen.

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