sq

package module
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 Go to latest Published: Aug 22, 2022 License: MIT Imports: 9 Imported by: 0

README

sq is a fork of squirrel, tuned according to my flavour.

The original code belongs to The Masterminds. See LICENSE.txt.

Documentation

Overview

Package sq provides a fluent SQL generator.

See https://github.com/tnychn/sq for examples.

Index

Examples

Constants

This section is empty.

Variables

View Source 
var (
	// Question is a PlaceholderFormat instance that leaves placeholders as
	// question marks.
	Question = questionFormat{}

	// Dollar is a PlaceholderFormat instance that replaces placeholders with
	// dollar-prefixed positional placeholders (e.g. $1, $2, $3).
	Dollar = dollarFormat{}

	// Colon is a PlaceholderFormat instance that replaces placeholders with
	// colon-prefixed positional placeholders (e.g. :1, :2, :3).
	Colon = colonFormat{}

	// AtP is a PlaceholderFormat instance that replaces placeholders with
	// "@p"-prefixed positional placeholders (e.g. @p1, @p2, @p3).
	AtP = atpFormat{}
)
View Source 
var StatementBuilder = StatementBuilderType(builder.EmptyBuilder).PlaceholderFormat(Question)

StatementBuilder is a parent builder for other builders, e.g. SelectBuilder.

Functions

func Alias 

func Alias(expr SQLizer, alias string) aliasExpr

Alias allows to define alias for column in SelectBuilder. Useful when column is defined as complex expression like IF or CASE.

Ex: 

.Column(Alias(caseStmt, "case_column"))

func ConcatExpr 

func ConcatExpr(parts ...interface{}) concatExpr

ConcatExpr builds an expression by concatenating strings and other expressions.

Ex: 

name_expr := Expr("CONCAT(?, ' ', ?)", firstName, lastName)
ConcatExpr("COALESCE(full_name,", name_expr, ")")

func DebugSQLizer 

func DebugSQLizer(s SQLizer) string

DebugSQLizer calls ToSQL on s and shows the approximate SQL to be executed.

If ToSQL returns an error, the result of this method will look like: "[ToSQL error: %s]" or "[DebugSQLizer error: %s]"

IMPORTANT: As its name suggests, this function should only be used for debugging. While the string result *might* be valid SQL, this function does not try very hard to ensure it. Additionally, executing the output of this function with any untrusted user input is certainly insecure.

func Placeholders 

func Placeholders(count int) string

Placeholders returns a string with count ? placeholders joined with commas.

Types

type And 

type And conj

And conjunction SQLizers

func (And) ToSQL 

func (a And) ToSQL() (string, []interface{}, error)

type CaseBuilder 

type CaseBuilder builder.Builder

CaseBuilder builds SQL CASE construct which could be used as parts of queries.

func Case 

func Case(what ...interface{}) CaseBuilder

Case returns a new CaseBuilder. "what" represents case value.

func (CaseBuilder) Else 

func (b CaseBuilder) Else(expr interface{}) CaseBuilder

Else sets optional "ELSE ..." part for CASE construct.

func (CaseBuilder) MustSQL 

func (b CaseBuilder) MustSQL() (string, []interface{})

MustSQL builds the query into a SQL string and bound args. It panics if there are any errors.

func (CaseBuilder) ToSQL 

func (b CaseBuilder) ToSQL() (string, []interface{}, error)

ToSQL builds the query into a SQL string and bound args.

func (CaseBuilder) When 

func (b CaseBuilder) When(when interface{}, then interface{}) CaseBuilder

When adds "WHEN ... THEN ..." part to CASE construct.

type DeleteBuilder 

type DeleteBuilder builder.Builder

DeleteBuilder builds SQL DELETE statements.

func Delete 

func Delete(from string) DeleteBuilder

Delete returns a new DeleteBuilder with the given table name.

See DeleteBuilder.From.

func (DeleteBuilder) From 

func (b DeleteBuilder) From(from string) DeleteBuilder

From sets the table to be deleted from.

func (DeleteBuilder) Limit 

func (b DeleteBuilder) Limit(limit uint64) DeleteBuilder

Limit sets a LIMIT clause on the query.

func (DeleteBuilder) MustSQL 

func (b DeleteBuilder) MustSQL() (string, []interface{})

MustSQL builds the query into a SQL string and bound args. It panics if there are any errors.

func (DeleteBuilder) Offset 

func (b DeleteBuilder) Offset(offset uint64) DeleteBuilder

Offset sets a OFFSET clause on the query.

func (DeleteBuilder) OrderBy 

func (b DeleteBuilder) OrderBy(orderBys ...string) DeleteBuilder

OrderBy adds ORDER BY expressions to the query.

func (DeleteBuilder) PlaceholderFormat 

func (b DeleteBuilder) PlaceholderFormat(f PlaceholderFormat) DeleteBuilder

PlaceholderFormat sets PlaceholderFormat (e.g. Question or Dollar) for the query.

func (DeleteBuilder) Prefix 

func (b DeleteBuilder) Prefix(sql string, args ...interface{}) DeleteBuilder

Prefix adds an expression to the beginning of the query.

func (DeleteBuilder) PrefixExpr 

func (b DeleteBuilder) PrefixExpr(expr SQLizer) DeleteBuilder

PrefixExpr adds an expression to the very beginning of the query.

func (DeleteBuilder) Suffix 

func (b DeleteBuilder) Suffix(sql string, args ...interface{}) DeleteBuilder

Suffix adds an expression to the end of the query.

func (DeleteBuilder) SuffixExpr 

func (b DeleteBuilder) SuffixExpr(expr SQLizer) DeleteBuilder

SuffixExpr adds an expression to the end of the query.

func (DeleteBuilder) ToSQL 

func (b DeleteBuilder) ToSQL() (string, []interface{}, error)

ToSQL builds the query into a SQL string and bound args.

func (DeleteBuilder) Where 

func (b DeleteBuilder) Where(pred interface{}, args ...interface{}) DeleteBuilder

Where adds WHERE expressions to the query.

See SelectBuilder.Where for more information.

type Eq 

type Eq map[string]interface{}

Eq is syntactic sugar for use with Where/Having/Set methods.

Example 
Select("id", "created", "first_name").From("users").Where(Eq{
	"company": 20,
})

func (Eq) ToSQL 

func (eq Eq) ToSQL() (sql string, args []interface{}, err error)

type Gt 

type Gt Lt

Gt is syntactic sugar for use with Where/Having/Set methods. Ex: 

.Where(Gt{"id": 1}) == "id > 1"

func (Gt) ToSQL 

func (gt Gt) ToSQL() (sql string, args []interface{}, err error)

type GtOrEq 

type GtOrEq Lt

GtOrEq is syntactic sugar for use with Where/Having/Set methods. Ex: 

.Where(GtOrEq{"id": 1}) == "id >= 1"

func (GtOrEq) ToSQL 

func (gtOrEq GtOrEq) ToSQL() (sql string, args []interface{}, err error)

type ILike 

type ILike Like

ILike is syntactic sugar for use with ILIKE conditions. Ex: 

.Where(ILike{"name": "sq%"})

func (ILike) ToSQL 

func (ilk ILike) ToSQL() (sql string, args []interface{}, err error)

type InsertBuilder 

type InsertBuilder builder.Builder

InsertBuilder builds SQL INSERT statements.

func Insert 

func Insert(into string) InsertBuilder

Insert returns a new InsertBuilder with the given table name.

See InsertBuilder.Into.

func Replace 

func Replace(into string) InsertBuilder

Replace returns a new InsertBuilder with the statement keyword set to "REPLACE" and with the given table name.

See InsertBuilder.Into.

func (InsertBuilder) Columns 

func (b InsertBuilder) Columns(columns ...string) InsertBuilder

Columns adds insert columns to the query.

func (InsertBuilder) Into 

func (b InsertBuilder) Into(from string) InsertBuilder

Into sets the INTO clause of the query.

func (InsertBuilder) MustSQL 

func (b InsertBuilder) MustSQL() (string, []interface{})

MustSQL builds the query into a SQL string and bound args. It panics if there are any errors.

func (InsertBuilder) Options 

func (b InsertBuilder) Options(options ...string) InsertBuilder

Options adds keyword options before the INTO clause of the query.

func (InsertBuilder) PlaceholderFormat 

func (b InsertBuilder) PlaceholderFormat(f PlaceholderFormat) InsertBuilder

PlaceholderFormat sets PlaceholderFormat (e.g. Question or Dollar) for the query.

func (InsertBuilder) Prefix 

func (b InsertBuilder) Prefix(sql string, args ...interface{}) InsertBuilder

Prefix adds an expression to the beginning of the query.

func (InsertBuilder) PrefixExpr 

func (b InsertBuilder) PrefixExpr(expr SQLizer) InsertBuilder

PrefixExpr adds an expression to the very beginning of the query.

func (InsertBuilder) Select 

func (b InsertBuilder) Select(sb SelectBuilder) InsertBuilder

Select set Select clause for insert query. If Values and Select are used, then Select has higher priority.

func (InsertBuilder) SetMap 

func (b InsertBuilder) SetMap(clauses map[string]interface{}) InsertBuilder

SetMap set columns and values for insert builder from a map of column name and value/ Note that it will reset all previous columns and values was set if any.

func (InsertBuilder) Suffix 

func (b InsertBuilder) Suffix(sql string, args ...interface{}) InsertBuilder

Suffix adds an expression to the end of the query.

func (InsertBuilder) SuffixExpr 

func (b InsertBuilder) SuffixExpr(expr SQLizer) InsertBuilder

SuffixExpr adds an expression to the end of the query.

func (InsertBuilder) ToSQL 

func (b InsertBuilder) ToSQL() (string, []interface{}, error)

ToSQL builds the query into a SQL string and bound args.

func (InsertBuilder) Values 

func (b InsertBuilder) Values(values ...interface{}) InsertBuilder

Values adds a single row's values to the query.

type Like 

type Like map[string]interface{}

Like is syntactic sugar for use with LIKE conditions. Ex: 

.Where(Like{"name": "%irrel"})

func (Like) ToSQL 

func (lk Like) ToSQL() (sql string, args []interface{}, err error)

type Lt 

type Lt map[string]interface{}

Lt is syntactic sugar for use with Where/Having/Set methods. Ex: 

.Where(Lt{"id": 1})

func (Lt) ToSQL 

func (lt Lt) ToSQL() (sql string, args []interface{}, err error)

type LtOrEq 

type LtOrEq Lt

LtOrEq is syntactic sugar for use with Where/Having/Set methods. Ex: 

.Where(LtOrEq{"id": 1}) == "id <= 1"

func (LtOrEq) ToSQL 

func (ltOrEq LtOrEq) ToSQL() (sql string, args []interface{}, err error)

type NotEq 

type NotEq Eq

NotEq is syntactic sugar for use with Where/Having/Set methods. Ex: 

.Where(NotEq{"id": 1}) == "id <> 1"

func (NotEq) ToSQL 

func (neq NotEq) ToSQL() (sql string, args []interface{}, err error)

type NotILike 

type NotILike Like

NotILike is syntactic sugar for use with ILIKE conditions. Ex: 

.Where(NotILike{"name": "sq%"})

func (NotILike) ToSQL 

func (nilk NotILike) ToSQL() (sql string, args []interface{}, err error)

type NotLike 

type NotLike Like

NotLike is syntactic sugar for use with LIKE conditions. Ex: 

.Where(NotLike{"name": "%irrel"})

func (NotLike) ToSQL 

func (nlk NotLike) ToSQL() (sql string, args []interface{}, err error)

type Or 

type Or conj

Or conjunction SQLizers.

func (Or) ToSQL 

func (o Or) ToSQL() (string, []interface{}, error)

type PlaceholderFormat 

type PlaceholderFormat interface {
	ReplacePlaceholders(sql string) (string, error)
}

PlaceholderFormat is the interface that wraps the ReplacePlaceholders method.

ReplacePlaceholders takes a SQL statement and replaces each question mark placeholder with a (possibly different) SQL placeholder.

type SQLizer 

type SQLizer interface {
	ToSQL() (string, []interface{}, error)
}

SQLizer is the interface that wraps the ToSQL method.

ToSQL returns a SQL representation of the SQLizer, along with a slice of args as passed to e.g. database/sql.Exec. It can also return an error.

func Expr 

func Expr(sql string, args ...interface{}) SQLizer

Expr builds an expression from a SQL fragment and arguments.

Ex: 

Expr("FROM_UNIXTIME(?)", t)

type SelectBuilder 

type SelectBuilder builder.Builder

SelectBuilder builds SQL SELECT statements.

func Select 

func Select(columns ...string) SelectBuilder

Select returns a new SelectBuilder, optionally setting some result columns.

See SelectBuilder.Columns.

Example 
Select("id", "created", "first_name").From("users") // ... continue building up your query

// sql methods in select columns are ok
Select("first_name", "count(*)").From("users")

// column aliases are ok too
Select("first_name", "count(*) as n_users").From("users")

func (SelectBuilder) Column 

func (b SelectBuilder) Column(column interface{}, args ...interface{}) SelectBuilder

Column adds a result column to the query. Unlike Columns, Column accepts args which will be bound to placeholders in the columns string, for example: 

Column("IF(col IN ("+sq.Placeholders(3)+"), 1, 0) as col", 1, 2, 3)

func (SelectBuilder) Columns 

func (b SelectBuilder) Columns(columns ...string) SelectBuilder

Columns adds result columns to the query.

Example 
query := Select("id").Columns("created", "first_name").From("users")

sql, _, _ := query.ToSQL()
fmt.Println(sql)

Output:
SELECT id, created, first_name FROM users
Example (Order) 
// out of order is ok too
query := Select("id").Columns("created").From("users").Columns("first_name")

sql, _, _ := query.ToSQL()
fmt.Println(sql)

Output:
SELECT id, created, first_name FROM users

func (SelectBuilder) CrossJoin 

func (b SelectBuilder) CrossJoin(join string, rest ...interface{}) SelectBuilder

CrossJoin adds a CROSS JOIN clause to the query.

func (SelectBuilder) Distinct 

func (b SelectBuilder) Distinct() SelectBuilder

Distinct adds a DISTINCT clause to the query.

func (SelectBuilder) From 

func (b SelectBuilder) From(from string) SelectBuilder

From sets the FROM clause of the query.

Example 
Select("id", "created", "first_name").From("users") // ... continue building up your query

func (SelectBuilder) FromSelect 

func (b SelectBuilder) FromSelect(from SelectBuilder, alias string) SelectBuilder

FromSelect sets a subquery into the FROM clause of the query.

Example 
usersByCompany := Select("company", "count(*) as n_users").From("users").GroupBy("company")
query := Select("company.id", "company.name", "users_by_company.n_users").
	FromSelect(usersByCompany, "users_by_company").
	Join("company on company.id = users_by_company.company")

sql, _, _ := query.ToSQL()
fmt.Println(sql)

Output:
SELECT company.id, company.name, users_by_company.n_users FROM (SELECT company, count(*) as n_users FROM users GROUP BY company) AS users_by_company JOIN company on company.id = users_by_company.company

func (SelectBuilder) GroupBy 

func (b SelectBuilder) GroupBy(groupBys ...string) SelectBuilder

GroupBy adds GROUP BY expressions to the query.

func (SelectBuilder) Having 

func (b SelectBuilder) Having(pred interface{}, rest ...interface{}) SelectBuilder

Having adds an expression to the HAVING clause of the query.

See Where.

func (SelectBuilder) InnerJoin 

func (b SelectBuilder) InnerJoin(join string, rest ...interface{}) SelectBuilder

InnerJoin adds a INNER JOIN clause to the query.

func (SelectBuilder) Join 

func (b SelectBuilder) Join(join string, rest ...interface{}) SelectBuilder

Join adds a JOIN clause to the query.

func (SelectBuilder) JoinClause 

func (b SelectBuilder) JoinClause(pred interface{}, args ...interface{}) SelectBuilder

JoinClause adds a join clause to the query.

func (SelectBuilder) LeftJoin 

func (b SelectBuilder) LeftJoin(join string, rest ...interface{}) SelectBuilder

LeftJoin adds a LEFT JOIN clause to the query.

func (SelectBuilder) Limit 

func (b SelectBuilder) Limit(limit uint64) SelectBuilder

Limit sets a LIMIT clause on the query.

func (SelectBuilder) MustSQL 

func (b SelectBuilder) MustSQL() (string, []interface{})

MustSQL builds the query into a SQL string and bound args. It panics if there are any errors.

func (SelectBuilder) Offset 

func (b SelectBuilder) Offset(offset uint64) SelectBuilder

Offset sets a OFFSET clause on the query.

func (SelectBuilder) Options 

func (b SelectBuilder) Options(options ...string) SelectBuilder

Options adds select option to the query.

func (SelectBuilder) OrderBy 

func (b SelectBuilder) OrderBy(orderBys ...string) SelectBuilder

OrderBy adds ORDER BY expressions to the query.

func (SelectBuilder) OrderByClause 

func (b SelectBuilder) OrderByClause(pred interface{}, args ...interface{}) SelectBuilder

OrderByClause adds ORDER BY clause to the query.

func (SelectBuilder) PlaceholderFormat 

func (b SelectBuilder) PlaceholderFormat(f PlaceholderFormat) SelectBuilder

PlaceholderFormat sets PlaceholderFormat (e.g. Question or Dollar) for the query.

func (SelectBuilder) Prefix 

func (b SelectBuilder) Prefix(sql string, args ...interface{}) SelectBuilder

Prefix adds an expression to the beginning of the query.

func (SelectBuilder) PrefixExpr 

func (b SelectBuilder) PrefixExpr(expr SQLizer) SelectBuilder

PrefixExpr adds an expression to the very beginning of the query.

func (SelectBuilder) RemoveLimit 

func (b SelectBuilder) RemoveLimit() SelectBuilder

RemoveLimit removes LIMIT clause.

func (SelectBuilder) RemoveOffset 

func (b SelectBuilder) RemoveOffset() SelectBuilder

RemoveOffset removes OFFSET clause.

func (SelectBuilder) RightJoin 

func (b SelectBuilder) RightJoin(join string, rest ...interface{}) SelectBuilder

RightJoin adds a RIGHT JOIN clause to the query.

func (SelectBuilder) Suffix 

func (b SelectBuilder) Suffix(sql string, args ...interface{}) SelectBuilder

Suffix adds an expression to the end of the query.

func (SelectBuilder) SuffixExpr 

func (b SelectBuilder) SuffixExpr(expr SQLizer) SelectBuilder

SuffixExpr adds an expression to the end of the query.

func (SelectBuilder) ToSQL 

func (b SelectBuilder) ToSQL() (string, []interface{}, error)

ToSQL builds the query into a SQL string and bound args.

Example 
var db *sql.DB

query := Select("id", "created", "first_name").From("users")

sql, args, err := query.ToSQL()
if err != nil {
	log.Println(err)
	return
}

rows, err := db.Query(sql, args...)
if err != nil {
	log.Println(err)
	return
}

defer rows.Close()

for rows.Next() {
	// scan...
}

func (SelectBuilder) Where 

func (b SelectBuilder) Where(pred interface{}, args ...interface{}) SelectBuilder

Where adds an expression to the WHERE clause of the query.

Expressions are ANDed together in the generated SQL.

Where accepts several types for its pred argument:

nil OR "" - ignored.

string - SQL expression. If the expression has SQL placeholders then a set of arguments must be passed as well, one for each placeholder.

map[string]interface{} OR Eq - map of SQL expressions to values. Each key is transformed into an expression like "<key> = ?", with the corresponding value bound to the placeholder. If the value is nil, the expression will be "<key> IS NULL". If the value is an array or slice, the expression will be "<key> IN (?,?,...)", with one placeholder for each item in the value. These expressions are ANDed together.

Where will panic if pred isn't any of the above types.

Example 
companyId := 20
Select("id", "created", "first_name").From("users").Where("company = ?", companyId)
Example (Helpers) 
companyId := 20

Select("id", "created", "first_name").From("users").Where(Eq{
	"company": companyId,
})

Select("id", "created", "first_name").From("users").Where(GtOrEq{
	"created": time.Now().AddDate(0, 0, -7),
})

Select("id", "created", "first_name").From("users").Where(And{
	GtOrEq{
		"created": time.Now().AddDate(0, 0, -7),
	},
	Eq{
		"company": companyId,
	},
})
Example (Multiple) 
companyId := 20

// multiple where's are ok

Select("id", "created", "first_name").
	From("users").
	Where("company = ?", companyId).
	Where(GtOrEq{
		"created": time.Now().AddDate(0, 0, -7),
	})

type StatementBuilderType 

type StatementBuilderType builder.Builder

StatementBuilderType is the type of StatementBuilder.

func (StatementBuilderType) Delete 

func (b StatementBuilderType) Delete(from string) DeleteBuilder

Delete returns a DeleteBuilder for this StatementBuilderType.

func (StatementBuilderType) Insert 

func (b StatementBuilderType) Insert(into string) InsertBuilder

Insert returns a InsertBuilder for this StatementBuilderType.

func (StatementBuilderType) PlaceholderFormat 

func (b StatementBuilderType) PlaceholderFormat(f PlaceholderFormat) StatementBuilderType

PlaceholderFormat sets the PlaceholderFormat field for any child builders.

func (StatementBuilderType) Replace 

func (b StatementBuilderType) Replace(into string) InsertBuilder

Replace returns a InsertBuilder for this StatementBuilderType with the statement keyword set to "REPLACE".

func (StatementBuilderType) Select 

func (b StatementBuilderType) Select(columns ...string) SelectBuilder

Select returns a SelectBuilder for this StatementBuilderType.

func (StatementBuilderType) Update 

func (b StatementBuilderType) Update(table string) UpdateBuilder

Update returns a UpdateBuilder for this StatementBuilderType.

func (StatementBuilderType) Where 

func (b StatementBuilderType) Where(pred interface{}, args ...interface{}) StatementBuilderType

Where adds WHERE expressions to the query.

See SelectBuilder.Where for more information.

type UpdateBuilder 

type UpdateBuilder builder.Builder

UpdateBuilder builds SQL UPDATE statements.

func Update 

func Update(table string) UpdateBuilder

Update returns a new UpdateBuilder with the given table name.

See UpdateBuilder.Table.

func (UpdateBuilder) Limit 

func (b UpdateBuilder) Limit(limit uint64) UpdateBuilder

Limit sets a LIMIT clause on the query.

func (UpdateBuilder) MustSQL 

func (b UpdateBuilder) MustSQL() (string, []interface{})

MustSQL builds the query into a SQL string and bound args. It panics if there are any errors.

func (UpdateBuilder) Offset 

func (b UpdateBuilder) Offset(offset uint64) UpdateBuilder

Offset sets a OFFSET clause on the query.

func (UpdateBuilder) OrderBy 

func (b UpdateBuilder) OrderBy(orderBys ...string) UpdateBuilder

OrderBy adds ORDER BY expressions to the query.

func (UpdateBuilder) PlaceholderFormat 

func (b UpdateBuilder) PlaceholderFormat(f PlaceholderFormat) UpdateBuilder

PlaceholderFormat sets PlaceholderFormat (e.g. Question or Dollar) for the query.

func (UpdateBuilder) Prefix 

func (b UpdateBuilder) Prefix(sql string, args ...interface{}) UpdateBuilder

Prefix adds an expression to the beginning of the query.

func (UpdateBuilder) PrefixExpr 

func (b UpdateBuilder) PrefixExpr(expr SQLizer) UpdateBuilder

PrefixExpr adds an expression to the very beginning of the query.

func (UpdateBuilder) Set 

func (b UpdateBuilder) Set(column string, value interface{}) UpdateBuilder

Set adds SET clauses to the query.

func (UpdateBuilder) SetMap 

func (b UpdateBuilder) SetMap(clauses map[string]interface{}) UpdateBuilder

SetMap is a convenience method which calls .Set for each key/value pair in clauses.

func (UpdateBuilder) Suffix 

func (b UpdateBuilder) Suffix(sql string, args ...interface{}) UpdateBuilder

Suffix adds an expression to the end of the query.

func (UpdateBuilder) SuffixExpr 

func (b UpdateBuilder) SuffixExpr(expr SQLizer) UpdateBuilder

SuffixExpr adds an expression to the end of the query.

func (UpdateBuilder) Table 

func (b UpdateBuilder) Table(table string) UpdateBuilder

Table sets the table to be updated.

func (UpdateBuilder) ToSQL 

func (b UpdateBuilder) ToSQL() (string, []interface{}, error)

ToSQL builds the query into a SQL string and bound args.

func (UpdateBuilder) Where 

func (b UpdateBuilder) Where(pred interface{}, args ...interface{}) UpdateBuilder

Where adds WHERE expressions to the query.

See SelectBuilder.Where for more information.

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