118 lines
2.5 KiB
Markdown
118 lines
2.5 KiB
Markdown
Core is a lightweight wrapper of sql.DB.
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[](https://drone.gitea.com/xorm/core)
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[](https://gocover.io/xorm.io/core)
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[](https://goreportcard.com/report/xorm.io/core)
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# Open
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```Go
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db, _ := core.Open(db, connstr)
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```
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# SetMapper
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```Go
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db.SetMapper(SameMapper())
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```
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## Scan usage
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### Scan
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```Go
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rows, _ := db.Query()
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for rows.Next() {
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rows.Scan()
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}
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```
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### ScanMap
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```Go
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rows, _ := db.Query()
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for rows.Next() {
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rows.ScanMap()
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```
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### ScanSlice
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You can use `[]string`, `[][]byte`, `[]interface{}`, `[]*string`, `[]sql.NullString` to ScanSclice. Notice, slice's length should be equal or less than select columns.
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```Go
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rows, _ := db.Query()
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cols, _ := rows.Columns()
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for rows.Next() {
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var s = make([]string, len(cols))
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rows.ScanSlice(&s)
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}
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```
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```Go
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rows, _ := db.Query()
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cols, _ := rows.Columns()
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for rows.Next() {
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var s = make([]*string, len(cols))
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rows.ScanSlice(&s)
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}
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```
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### ScanStruct
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```Go
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rows, _ := db.Query()
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for rows.Next() {
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rows.ScanStructByName()
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rows.ScanStructByIndex()
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}
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```
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## Query usage
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```Go
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rows, err := db.Query("select * from table where name = ?", name)
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user = User{
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Name:"lunny",
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}
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rows, err := db.QueryStruct("select * from table where name = ?Name",
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&user)
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var user = map[string]interface{}{
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"name": "lunny",
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}
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rows, err = db.QueryMap("select * from table where name = ?name",
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&user)
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```
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## QueryRow usage
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```Go
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row := db.QueryRow("select * from table where name = ?", name)
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user = User{
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Name:"lunny",
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}
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row := db.QueryRowStruct("select * from table where name = ?Name",
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&user)
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var user = map[string]interface{}{
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"name": "lunny",
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}
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row = db.QueryRowMap("select * from table where name = ?name",
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&user)
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```
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## Exec usage
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```Go
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db.Exec("insert into user (`name`, title, age, alias, nick_name,created) values (?,?,?,?,?,?)", name, title, age, alias...)
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user = User{
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Name:"lunny",
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Title:"test",
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Age: 18,
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}
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result, err = db.ExecStruct("insert into user (`name`, title, age, alias, nick_name,created) values (?Name,?Title,?Age,?Alias,?NickName,?Created)",
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&user)
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var user = map[string]interface{}{
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"Name": "lunny",
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"Title": "test",
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"Age": 18,
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}
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result, err = db.ExecMap("insert into user (`name`, title, age, alias, nick_name,created) values (?Name,?Title,?Age,?Alias,?NickName,?Created)",
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&user)
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``` |