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// Copyright 2013 The XORM Authors. All rights reserved.
// Use of this source code is governed by a BSD
// license that can be found in the LICENSE file.
/*
Package xorm is a simple and powerful ORM for Go.
Installation
Make sure you have installed Go 1.1+ and then:
go get github.com/lunny/xorm
Create Engine
Firstly, we should new an engine for a database
engine, err := xorm.NewEngine(driverName, dataSourceName)
Method NewEngine's parameters is the same as sql.Open. It depends
drivers' implementation.
Generally, one engine is enough. You can set it as package variable.
Raw Methods
Xorm also support raw sql execution:
1. query sql, the returned results is []map[string][]byte
results, err := engine.Query("select * from user")
2. exec sql, the returned results
affected, err := engine.Exec("update user set .... where ...")
ORM Methods
There are 7 major ORM methods and many helpful methods to use to operate database.
1. Insert one or multipe records to database
affected, err := engine.Insert(&struct)
// INSERT INTO struct () values ()
affected, err := engine.Insert(&struct1, &struct2)
// INSERT INTO struct1 () values ()
// INSERT INTO struct2 () values ()
affected, err := engine.Insert(&sliceOfStruct)
// INSERT INTO struct () values (),(),()
affected, err := engine.Insert(&struct1, &sliceOfStruct2)
// INSERT INTO struct1 () values ()
// INSERT INTO struct2 () values (),(),()
2. Query one record from database
has, err := engine.Get(&user)
// SELECT * FROM user LIMIT 1
3. Query multiple records from database
err := engine.Find(...)
// SELECT * FROM user
4. Query multiple records and record by record handle, there two methods, one is Iterate,
another is Raws
raws, err := engine.Raws(...)
// SELECT * FROM user
for raws.Next() {
raws.Scan(bean)
}
err := engine.Iterate(...)
// SELECT * FROM user
5. Update one or more records
affected, err := engine.Update(&user)
// UPDATE user SET
6. Delete one or more records
affected, err := engine.Delete(&user)
// DELETE FROM user Where ...
7. Count records
counts, err := engine.Count(&user)
// SELECT count(*) AS total FROM user
Conditions
The above 7 methods could use with condition methods.
1. Id, In
engine.Id(1).Get(&user)
// SELECT * FROM user WHERE id = 1
engine.In("id", 1, 2, 3).Find(&users)
// SELECT * FROM user WHERE id IN (1, 2, 3)
2. Where, And, Or
engine.Where().And().Or().Find()
// SELECT * FROM user WHERE (.. AND ..) OR ...
3. OrderBy, Asc, Desc
engine.Asc().Desc().Find()
// SELECT * FROM user ORDER BY .. ASC, .. DESC
engine.OrderBy().Find()
// SELECT * FROM user ORDER BY ..
4. Limit, Top
engine.Limit().Find()
// SELECT * FROM user LIMIT .. OFFSET ..
engine.Top().Find()
// SELECT * FROM user LIMIT ..
5. Sql
engine.Sql("select * from user").Find()
6. Cols, Omit, Distinct
engine.Cols("col1, col2").Find()
// SELECT col1, col2 FROM user
engine.Omit("col1").Find()
// SELECT col2, col3 FROM user
engine.Distinct("col1").Find()
// SELECT DISTINCT col1 FROM user
7. Join, GroupBy, Having
engine.GroupBy("name").Having("name='xlw'").Find()
//SELECT * FROM user GROUP BY name HAVING name='xlw'
engine.Join("LEFT", "userdetail", "user.id=userdetail.id").Find()
//SELECT * FROM user LEFT JOIN userdetail ON user.id=userdetail.id
More usage, please visit https://github.com/lunny/xorm/blob/master/docs/QuickStartEn.md
*/
package xorm
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