在c#中执行包含子选择的oracle查询

Question

这是一个类似于我要执行的查询：

with x as(
    select ds.*, row_number() over (partition by FOO order by BAR) rn
    from datasource ds
    where datasupplierid = 3)
select column1, column2, rn from x where rn <= 2

我正在这样执行它（来自 c#）：

using (var con = new OracleConnection(this.connectionString)) {
    con.Open();

    OracleCommand cmd = con.CreateCommand();
    cmd.CommandText = this.command;//my query
    cmd.CommandType = CommandType.Text;

    var reader = cmd.ExecuteReader();
}

我从中得到的是 ORA-00933: SQL 命令未正确结束错误。

我尝试将查询重写为这种形式：

select column1, column2, rn from (
    select ds.*, row_number() over (partition by FOO order by BAR) rn
    from datasource ds
    where datasupplierid = 3)
where rn <= 2

但这并没有解决我的问题。有没有办法执行这样的查询？

Answer 1

将您的第一个查询更改为

;with x as(
    select ds.*, row_number() over (partition by FOO order by BAR) rn
    from datasource ds
    where datasupplierid = 3)
select column1, column2, rn from x where rn <= 2

对于查询的重写，您需要为内联视图起别名

select column1, column2, rn from (
    select ds.*, row_number() over (partition by FOO order by BAR) rn
    from datasource ds
    where datasupplierid = 3) xxx
where rn <= 2