Question

我正在尝试编写视图并从该视图中检索数据，我已经这样做了：

 string command = "if OBJECT_ID('try1') IS NOT NULL Drop view try1" +"\n"+"go"+"\n";
        command = command + "Create view try1 as select WBSCode,Description,TerritoryCode,AmountReleased,convert(varchar(25),CreatedOn,106) as CreatedOn,IsEnable from WBS where WBSCode like '%" + msrch + "%'";
        command = command +"\n"+"go"+"\n"+"select WBSCode,Description,TerritoryCode,AmountReleased,convert(varchar(25),CreatedOn,106) as CreatedOn,IsEnable from try1 where TerritoryCode in (select TerritoryCode from Territory where StateCode='" + mbcode + "')";
        SqlCommand cmdd = new SqlCommand(command);
        cmdd.Connection = con;
        SqlDataAdapter da = new SqlDataAdapter(cmdd);
        DataTable dt = new DataTable();
        da.Fill(dt);
        if (dt.Rows.Count > 0)
        {
            mngwbsGV1.DataSource = dt;
            mngwbsGV1.DataBind();
        }

但问题是我在da.Fill(dt)收到错误：

'go'附近的语法不正确。
'CREATE VIEW'必须是查询批次中的第一个语句 'go'附近的语法不正确。

但是当我在SQL Server 2008中运行它时，它正在运行但没有检索数据

我该怎么办？

Answer 1

您应该单独创建视图，例如在安装或版本升级期间 - 使用常规SQL脚本。

如果必须在代码中执行此操作 - 您需要这样做：

using(SqlConnection conn = new SqlConnection(--your connection string here--))
{
    SqlCommand dropView = new SqlCommand("IF OBJECT_ID('try1') IS NOT NULL DROP VIEW try1", conn);

    conn.Open();

    dropView.ExecuteNonQuery();

    SqlCommand createView = new SqlCommand("CREATE VIEW try1 AS SELECT WBSCode, Description, TerritoryCode, AmountReleased, CONVERT(VARCHAR(25), CreatedOn, 106) AS CreatedOn, IsEnable FROM WBS ", conn);

    createView.ExecuteNonQuery();

    conn.Close();
}

然后您可以使用它来选择它（使用参数化查询而不是将SQL命令连接在一起以避免SQL注入攻击并提高性能！）：

SqlCommand selectCmd = new SqlCommand("SELECT WBSCode, Description, TerritoryCode, AmountReleased, CreatedOn, IsEnable FROM try1 WHERE TerritoryCode IN (SELECT TerritoryCode FROM Territory WHERE WBSCode LIKE @msrch AND StateCode = @mbcode", conn);

selectCmd.Parameters.Add("@msrch", SqlDbType.VarChar, 50).Value = "%" + msrch + "%";
selectCmd.Parameters.Add("@mbcode", SqlDbType.VarChar, 50).Value = mbcode;

SqlDataAdapter da = new SqlDataAdapter(selectCmd);

DataTable dt = new DataTable();
da.Fill(dt);

if (dt.Rows.Count > 0)
{
    mngwbsGV1.DataSource = dt;
    mngwbsGV1.DataBind();
}

但话又说回来：如果你有这样一个简单的选择 - 你首先需要一个视图，特别是如果你只想创建它，从中选择，然后立即再次删除它。根本没有任何意义....

从asp.net中的视图创建和选择数据没有发生？

1 个答案: