mirror of https://github.com/go-gitea/gitea.git
206 lines
5.4 KiB
Markdown
206 lines
5.4 KiB
Markdown
# SQL builder
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[](https://gitci.cn/go-xorm/builder) [](https://codecov.io/gh/go-xorm/builder)
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[](https://goreportcard.com/report/github.com/go-xorm/builder)
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Package builder is a lightweight and fast SQL builder for Go and XORM.
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Make sure you have installed Go 1.8+ and then:
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go get github.com/go-xorm/builder
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# Insert
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```Go
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sql, args, err := builder.Insert(Eq{"c": 1, "d": 2}).Into("table1").ToSQL()
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// INSERT INTO table1 SELECT * FROM table2
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sql, err := builder.Insert().Into("table1").Select().From("table2").ToBoundSQL()
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// INSERT INTO table1 (a, b) SELECT b, c FROM table2
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sql, err = builder.Insert("a, b").Into("table1").Select("b, c").From("table2").ToBoundSQL()
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```
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# Select
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```Go
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// Simple Query
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sql, args, err := Select("c, d").From("table1").Where(Eq{"a": 1}).ToSQL()
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// With join
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sql, args, err = Select("c, d").From("table1").LeftJoin("table2", Eq{"table1.id": 1}.And(Lt{"table2.id": 3})).
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RightJoin("table3", "table2.id = table3.tid").Where(Eq{"a": 1}).ToSQL()
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// From sub query
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sql, args, err := Select("sub.id").From(Select("c").From("table1").Where(Eq{"a": 1}), "sub").Where(Eq{"b": 1}).ToSQL()
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// From union query
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sql, args, err = Select("sub.id").From(
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Select("id").From("table1").Where(Eq{"a": 1}).Union("all", Select("id").From("table1").Where(Eq{"a": 2})),"sub").
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Where(Eq{"b": 1}).ToSQL()
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// With order by
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sql, args, err = Select("a", "b", "c").From("table1").Where(Eq{"f1": "v1", "f2": "v2"}).
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OrderBy("a ASC").ToSQL()
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// With limit.
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// Be careful! You should set up specific dialect for builder before performing a query with LIMIT
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sql, args, err = Dialect(MYSQL).Select("a", "b", "c").From("table1").OrderBy("a ASC").
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Limit(5, 10).ToSQL()
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```
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# Update
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```Go
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sql, args, err := Update(Eq{"a": 2}).From("table1").Where(Eq{"a": 1}).ToSQL()
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```
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# Delete
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```Go
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sql, args, err := Delete(Eq{"a": 1}).From("table1").ToSQL()
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```
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# Union
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```Go
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sql, args, err := Select("*").From("a").Where(Eq{"status": "1"}).
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Union("all", Select("*").From("a").Where(Eq{"status": "2"})).
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Union("distinct", Select("*").From("a").Where(Eq{"status": "3"})).
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Union("", Select("*").From("a").Where(Eq{"status": "4"})).
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ToSQL()
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```
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# Conditions
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* `Eq` is a redefine of a map, you can give one or more conditions to `Eq`
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```Go
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import . "github.com/go-xorm/builder"
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sql, args, _ := ToSQL(Eq{"a":1})
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// a=? [1]
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sql, args, _ := ToSQL(Eq{"b":"c"}.And(Eq{"c": 0}))
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// b=? AND c=? ["c", 0]
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sql, args, _ := ToSQL(Eq{"b":"c", "c":0})
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// b=? AND c=? ["c", 0]
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sql, args, _ := ToSQL(Eq{"b":"c"}.Or(Eq{"b":"d"}))
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// b=? OR b=? ["c", "d"]
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sql, args, _ := ToSQL(Eq{"b": []string{"c", "d"}})
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// b IN (?,?) ["c", "d"]
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sql, args, _ := ToSQL(Eq{"b": 1, "c":[]int{2, 3}})
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// b=? AND c IN (?,?) [1, 2, 3]
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```
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* `Neq` is the same to `Eq`
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```Go
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import . "github.com/go-xorm/builder"
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sql, args, _ := ToSQL(Neq{"a":1})
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// a<>? [1]
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sql, args, _ := ToSQL(Neq{"b":"c"}.And(Neq{"c": 0}))
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// b<>? AND c<>? ["c", 0]
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sql, args, _ := ToSQL(Neq{"b":"c", "c":0})
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// b<>? AND c<>? ["c", 0]
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sql, args, _ := ToSQL(Neq{"b":"c"}.Or(Neq{"b":"d"}))
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// b<>? OR b<>? ["c", "d"]
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sql, args, _ := ToSQL(Neq{"b": []string{"c", "d"}})
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// b NOT IN (?,?) ["c", "d"]
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sql, args, _ := ToSQL(Neq{"b": 1, "c":[]int{2, 3}})
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// b<>? AND c NOT IN (?,?) [1, 2, 3]
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```
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* `Gt`, `Gte`, `Lt`, `Lte`
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```Go
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import . "github.com/go-xorm/builder"
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sql, args, _ := ToSQL(Gt{"a", 1}.And(Gte{"b", 2}))
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// a>? AND b>=? [1, 2]
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sql, args, _ := ToSQL(Lt{"a", 1}.Or(Lte{"b", 2}))
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// a<? OR b<=? [1, 2]
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```
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* `Like`
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```Go
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import . "github.com/go-xorm/builder"
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sql, args, _ := ToSQL(Like{"a", "c"})
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// a LIKE ? [%c%]
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```
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* `Expr` you can customerize your sql with `Expr`
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```Go
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import . "github.com/go-xorm/builder"
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sql, args, _ := ToSQL(Expr("a = ? ", 1))
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// a = ? [1]
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sql, args, _ := ToSQL(Eq{"a": Expr("select id from table where c = ?", 1)})
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// a=(select id from table where c = ?) [1]
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```
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* `In` and `NotIn`
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```Go
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import . "github.com/go-xorm/builder"
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sql, args, _ := ToSQL(In("a", 1, 2, 3))
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// a IN (?,?,?) [1,2,3]
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sql, args, _ := ToSQL(In("a", []int{1, 2, 3}))
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// a IN (?,?,?) [1,2,3]
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sql, args, _ := ToSQL(In("a", Expr("select id from b where c = ?", 1))))
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// a IN (select id from b where c = ?) [1]
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```
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* `IsNull` and `NotNull`
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```Go
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import . "github.com/go-xorm/builder"
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sql, args, _ := ToSQL(IsNull{"a"})
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// a IS NULL []
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sql, args, _ := ToSQL(NotNull{"b"})
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// b IS NOT NULL []
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```
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* `And(conds ...Cond)`, And can connect one or more condtions via And
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```Go
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import . "github.com/go-xorm/builder"
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sql, args, _ := ToSQL(And(Eq{"a":1}, Like{"b", "c"}, Neq{"d", 2}))
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// a=? AND b LIKE ? AND d<>? [1, %c%, 2]
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```
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* `Or(conds ...Cond)`, Or can connect one or more conditions via Or
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```Go
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import . "github.com/go-xorm/builder"
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sql, args, _ := ToSQL(Or(Eq{"a":1}, Like{"b", "c"}, Neq{"d", 2}))
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// a=? OR b LIKE ? OR d<>? [1, %c%, 2]
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sql, args, _ := ToSQL(Or(Eq{"a":1}, And(Like{"b", "c"}, Neq{"d", 2})))
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// a=? OR (b LIKE ? AND d<>?) [1, %c%, 2]
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```
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* `Between`
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```Go
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import . "github.com/go-xorm/builder"
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sql, args, _ := ToSQL(Between{"a", 1, 2})
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// a BETWEEN 1 AND 2
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```
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* Define yourself conditions
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Since `Cond` is an interface.
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```Go
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type Cond interface {
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WriteTo(Writer) error
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And(...Cond) Cond
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Or(...Cond) Cond
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IsValid() bool
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}
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```
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You can define yourself conditions and compose with other `Cond`. |