golang xorm MSSQL where查询案例
xorm官方中文文档 参考 http://xorm.io/docs/
以sqlserver为例
先初始化连接等...
engine, err := xorm.NewEngine("mssql", "server=127.0.0.1;user id=sa;password=123456;database=dbname")
//控制台打印SQL语句
engine.ShowSQL(true)
if err != nil {
fmt.Println(err)
}
defer engine.Close()
一、查询案例
ids := []model.MsIdcaid{} //实体定义的话自己写
engine.Cols("Id", "Address").Where("id in(2,3,4,5,6)").OrderBy("id desc,address asc").Find(&ids)
//[SQL] SELECT "Id", "Address" FROM "cdsgus" WHERE (id in(2,3,4,5,6)) ORDER BY id desc,address asc
或者直接自己写SQL
engine.SQL("SELECT Address from cdsgus where id in (2,3,4,6) order by id desc ").Find(&ids)
//[SQL] SELECT Address from cdsgus where id in (2,3,4,6) order by id desc
二、分页查询
方式一 ：用Limit(int i,int j) 方法， i=要取的条数， j=开始的位置
MSSQL 虽然执行的结果正确，可以看到生成的分页SQL很乱，建议直接MSSQL分页直接用方式二写在SQL里。其他数据库应该是没有问题， 如：mysql
其实本文用数据库的版本SQL2014 是支持：OFFSET 2 ROW FETCH NEXT 10 ROW ONLY的写法的，xorm并未识别数据库的版本调整分页SQL
engine.Cols("Id", "Name").Where("id in(2,3,4,5,6)").OrderBy("id desc,address asc").Limit(10, 2).Find(&ids)
//[[SQL] SELECT TOP 10 "Id", "Name" FROM "cdsgus" WHERE (id in(2,3,4,5,6)) AND (id NOT IN (SELECT TOP 2 id FROM "cdsgus" WHERE (id in(2,3,4,5,6)) ORDER BY id desc,address asc)) ORDER BY id desc,address asc
方式二 ：用原生的SQL方法 ，很妥
engine.SQL("SELECT Id,Name from cdsgus where id in (2,3,4,5,6) order by id desc OFFSET 2 ROW FETCH NEXT 10 ROW ONLY").Find(&ids)
//[SQL] SELECT Id,Name from cdsgus where id in (2,3,4,5,6) order by id desc OFFSET 2 ROW FETCH NEXT 10 ROW ONLY
方式三 ：用原生的SQL + Limit 方法 ？？MSSQL居然是错误SQL&结果
engine.Sql("SELECT Id,Name from cdsgus where id in (2,3,4,5,6) ").OrderBy("id").Limit(10, 2).Find(&ids)
//[SQL] SELECT Id,Name from cdsgus where id in (2,3,4,5,6)
data, _ := engine.Sql("SELECT Id,Name from cdsgus where id in (2,3,4,5,6) ").OrderBy("id").Limit(10, 2).Query()
//[SQL] SELECT Id,Name from cdsgus where id in (2,3,4,5,6)
