sqlbuilder

umisama/go-sqlbuilder

go-sqlbuilder is a SQL-query builder for golang. This supports you using relational database with more readable and flexible code than raw SQL query string.

Support

• Generate SQL query programmatically.
  • fluent flexibility! yeah!!
• Basic SQL statements
  • SELECT/INSERT/UPDATE/DELETE/DROP/CREATE TABLE/CREATE INDEX
• Strict error checking
• Some database server
  • Sqlite3(mattn/go-sqlite3)
  • MySQL(ziutek/mymysql)
  • MySQL(go-sql-driver/mysql)
  • PostgresSQL(lib/pq)
• Subquery in SELECT FROM clause

TODO

• Support UNION clause
• Support LOCK clause

Quick usage

import (
	sb "github.com/umisama/go-sqlbuilder"
	"github.com/umisama/go-sqlbuilder/dialects"
)

db, err := sql.Open("sqlite3", ":memory:")
if err != nil {
	fmt.Println(err.Error())
	return
}

// Set dialect first
// dialects are in github.com/umisama/go-sqlbuilder/dialects
sb.SetDialect(TestDialect{})

// Define a table
tbl_person := sb.NewTable(
	"PERSON",
	&sb.TableOption{},
	sb.IntColumn("id", &sb.ColumnOption{
		PrimaryKey: true,
	}),
	sb.StringColumn("name", &sb.ColumnOption{
		Unique:  true,
		Size:    255,
		Default: "no_name",
	}),
	sb.DateColumn("birth", nil),
)

// Create Table
query, args, err := sb.CreateTable(tbl_person).ToSql()
if err != nil {
	fmt.Println(err.Error())
	return
}
_, err = db.Exec(query, args...)
if err != nil {
	fmt.Println(err.Error())
	return
}

// Insert data
// (Table).C function returns a column object.
query, args, err = sb.Insert(tbl_person).
	Set(tbl_person.C("name"), "Kurisu Makise").
	Set(tbl_person.C("birth"), time.Date(1992, time.July, 25, 0, 0, 0, 0, time.UTC)).
	ToSql()
_, err = db.Exec(query, args...)
if err != nil {
	fmt.Println(err.Error())
	return
}

// Query
// (Column).Eq returns a condition object for equal(=) operator.  See
var birth time.Time
query, args, err = sb.Select(tbl_person).Columns(
	tbl_person.C("birth"),
).Where(
	tbl_person.C("name").Eq("Kurisu Makise"),
).ToSql()
err = db.QueryRow(query, args...).Scan(&birth)
if err != nil {
	fmt.Println(err.Error())
	return
}

fmt.Printf("Kurisu's birthday is %s,%d %d", birth.Month().String(), birth.Day(), birth.Year())

// Output:
// Kurisu's birthday is July,25 1992

Examples

Initialize

off course, go getable.

$ go get github.com/umisama/go-sqlbuilder

I recomended to set "sb" as sqlbuilder's shorthand.

import sb "github.com/umisama/go-sqlbuilder"

// First, you set dialect for your DB
func init (
	sb.SetDialect(sb.SqliteDialect{})
)

Define a table

Sqlbuilder needs table definition to strict query generating. Any statement checks column type and constraints.

tbl_person := sb.NewTable(
	"PERSON",
	&sb.TableOption{},
	sb.IntColumn("id", &sb.ColumnOption{
		PrimaryKey: true,
	}),
	sb.StringColumn("name", &sb.ColumnOption{
		Unique:  true,
		Size:    255,
		Default: "no_name",
	}),
	sb.DateColumn("birth", nil),
)

Table Options

Sets UNIQUE options to table.

example:

&sb.TableOption{
	Unique: [][]string{
		{"hoge", "piyo"},
		{"fuga"},
	}
}

CREATE TABLE PERSON ( "id" integer, ~~~, UNIQUE("hoge", "piyo"), UNIQUE("fuga"))

Column Options

true for add primary key option.

true for add UNIQUE option.

true for add UNIQUE option to column.

example:

IntColumn("test", &sb.ColumnOption{
	Unique: true,
})

"test" INTEGER UNIQUE

true for add AutoIncrement option to column.

Sets size for string column. example:

StringColumn("test", &sb.ColumnOption{
	Size: 255,
})

"test" VARCHAR(255)

Sets type for column on AnyColumn.

AnyColumn("test", &sb.ColumnOption{
	ColumnType: "BLOB",
})

"test" BLOB

Sets default value. Default's type need to be same as column.

StringColumn("test", &sb.ColumnOption{
	Size:    255,
	Default: "empty"
})

"test" VARCHAR(255) DEFAILT "empty"

CRATE TABLE statement

Sqlbuilder has a Statement object generating CREATE TABLE statement from table object.
Statement objects have ToSql() method. it returns query(string), placeholder arguments([]interface{}) and error.

query, args, err := sb.CreateTable(tbl_person).ToSql()
if err != nil {
	panic(err)
}
// query == `CREATE TABLE "PERSON" ( "id" INTEGER PRIMARY KEY, "value" INTEGER );`
// args  == []interface{}{}
// err   == nil

You can exec with database/sql package or Table-struct mapper(for example, gorp).
here is example,

db, err := sql.Open("sqlite3", ":memory:")
if err != nil {
	panic(err)
}
_, err = db.Exec(query, args...)
if err != nil {
	panic(err)
}

INSERT statement

Sqlbuilder can generate INSERT statement. You can checkout a column with Table.C([column_name]) method.

query, args, err := sb.Insert(table1).
	Columns(table1.C("id"), table1.C("value")).
	Values(1, 10).
	ToSql()
// query == `INSERT INTO "TABLE_A" ( "id", "value" ) VALUES ( ?, ? );`
// args  == []interface{}{1, 10}
// err   == nil

Or, can use Set() method.

query, args, err := sb.Insert(table1).
	Set(table1.C("id"), 1).
	Set(table1.C("value"), 10).
	ToSql()
// query == `INSERT INTO "TABLE_A" ( "id", "value" ) VALUES ( ?, ? );`
// args  == []interface{}{1, 10}
// err   == nil

SELECT statement

Sqlbuilder can generate SELECT statement with readable interfaces. Condition object is generated from column object.

query, args, err := sb.Select(table1.C("id"), table1.C("value")).
	From(table1).
	Where(
		table1.C("id").Eq(10),
	).
	Limit(1).OrderBy(false, table1.C("id")).
	ToSql()
// query == `SELECT "TABLE_A"."id", "TABLE_A"."value" FROM "TABLE_A" WHERE "TABLE_A"."id"=? ORDER BY "TABLE_A"."id" ASC LIMIT ?;`
// args  == []interface{}{10, 1}
// err   == nil

See godoc.org for more options

Condition

You can define condition with Condition objects. Condition object create from Column's method.

More than one condition can combine with AND & OR operator.

Sqlbuilder is supporting most common condition operators.
Here is supporting:

Document for all: godoc(Column)

More documents

godoc.org

License

under the MIT license