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  • 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)    
    

    方式四 : github.com/go-xorm/builder

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  • 原文地址:https://www.cnblogs.com/nickchou/p/9564652.html
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