如何从存储过程中获取SQL字符串结果并将其保存在c# Windows应用程序字符串变量中

本文关键字：字符串 存在 保存 Windows 变量 应用程序 结果 存储 存储过程 过程中 SQL | 更新日期: 2023-09-27 18:13:43

我有以下存储过程:

ALTER PROCEDURE [dbo].[ProcedureName] 
    @date NVARCHAR(50)
AS
BEGIN
    SET NOCOUNT ON;
    DECLARE @result nvarchar(500) -- this one should return string.
    DECLARE @variable1 NVARCHAR(50)
    set @variable1 = (SELECT COUNT(*) FROM dbo.Table1 WHERE column1 not in (select column1 from dbo.Table2))
    DECLARE @variable2 NVARCHAR(50)
    update dbo.Table1 set columnX = 1 where column1 not in (select column1 from  dbo.Table2)
    set @variable2 = @@ROWCOUNT

等等…它大概有200行脚本，至少有10-12个变量

之后我想得到这样的结果

'Hello,' + 
'Some Text here' + 
@date +': ' + 
'Explaining text for variable1- ' + @variable1 + 
'Updated rows from variable2 - ' + @variable2 + 
'some other select count - ' + @variable3 +
'some other update rowcount - '+ @variable4
......

到现在为止，我能够得到这个与PRINT语句，但不能把它作为变量在我的c#代码，它是这样的:

public void Execute_Click(object sender, EventArgs e)
{
    if (MessageBox.Show("Are you sure you want to execute the program?", "Confirm Start", MessageBoxButtons.YesNo, MessageBoxIcon.Question) != DialogResult.No)
    {
        string connectionString = GetConnectionString(usernamePicker.Text, passwordPicker.Text);
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            using (SqlCommand cmd = new SqlCommand("dbo.ProcedureName", connection))
            {
                connection.Open();
                cmd.CommandText = "dbo.ProcedureName";
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.Add("@date", SqlDbType.VarChar).Value = dateTimePicker1.Text;
                SqlParameter result = cmd.Parameters.Add("@result", SqlDbType.VarChar);
                result.Direction = ParameterDirection.ReturnValue;
                cmd.ExecuteScalar();
                var resultout = (string)cmd.Parameters["@result"].Value;
                connection.Close();
                TextMessage.Text = dateTimePicker1.Text;
            }
        }
    }
}

所有我得到的结果是0或NULL或等。我试图从SQL返回值与PRINT, return, SET, OUTPUT .......但似乎什么都不起作用。然而，从c#到SQL中获取变量似乎像儿童工作。什么好主意吗?

如何从存储过程中获取SQL字符串结果并将其保存在c# Windows应用程序字符串变量中

如果您想返回连接字符串作为输出，那么在过程结束时只需写入select @result。请确保在此语句之前已将其连接起来。

这将返回你可以在c#代码中使用的字符串

将存储过程更改为:

ALTER PROCEDURE [dbo].[ProcedureName] 
    @date NVARCHAR(50),
    @variable1 NVARCHAR(50) output,
    @variable2 NVARCHAR(50) output
AS
BEGIN
    SET NOCOUNT ON;
    DECLARE @result nvarchar(500) -- this one should return string.
    set @variable1 = (SELECT COUNT(*) FROM dbo.Table1 WHERE column1 not in (select column1 from dbo.Table2))
    update dbo.Table1 set columnX = 1 where column1 not in (select column1 from  dbo.Table2)
    set @variable2 = @@ROWCOUNT

并像这样修改代码:

SqlParameter result1 = cmd.Parameters.Add("@variable1", SqlDbType.VarChar);
result1.Direction = ParameterDirection.ReturnValue;
SqlParameter result2 = cmd.Parameters.Add("@variable2", SqlDbType.VarChar);
result2.Direction = ParameterDirection.ReturnValue;

假设我执行了这个过程

ALTER PROCEDURE [dbo].[ProcedureName] 
    @date NVARCHAR(50),
    @result nvarchar(500) output
AS
BEGIN
    SET NOCOUNT ON;

    DECLARE @variable1 NVARCHAR(50)
    set @variable1 = (SELECT COUNT(*) FROM dbo.Table1 WHERE column1 not in (select column1 from Table2))
    set @result = @variable1 + ' some text '

我想要"@result"从过程输出文本，并得到它与c#

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