c# - SQL 查询参数名称必须定义

Question

你好，我有这个 SQL 查询:

SQL = "SELECT SUM( " + "CASE WHEN rn =1" + "THEN v.FirstAmount" 
      + "WHEN rn =2" + "THEN v.SecondAmount " + "ELSE v.ThirdAmount " + "END ) " 
      + "FROM (" + "SELECT cv. * , @rn := IF( @vi = `Violation ID` , @rn +1, 1 ) AS rn,          
       @vi := `Violation ID` " + "FROM class_violation cv" + "CROSS JOIN (" 
      + "SELECT @rn :=0, @vi := ''" + ")CONST" + "ORDER BY `Violation ID`" + ")cv" 
      + "JOIN violation v ON cv.`Violation ID` = v.`Violation ID` " 
      + "JOIN class_record tr ON cv.`Class No.` = tr.`Class No.` " 
      + "WHERE tr.`Class ID` = '" + where + "'";

---

我得到这个错误:

MySql.Data.MySqlClient.MySqlException: Fatal Error encountered during
command execution ---> MySql.Data.MySqlClient.MySqlException: Parameter
'@rn' must be defined
 at
MySql.Data.MySqlClient.Statement.SerializeParameter(MySqlParameterCollection
parameters, MySqlPacket packet, String parmName, Int32 parameterIndex)
    at MySql.Data.MySqlClient.Statement.InternalBindParameters(String sql,
    MySqlParameterCollection parameters,MySqlPacket packet)

我将如何更正我的 SQL 查询并定义参数？

Answer 1

我想我知道如何回答我的问题。在我的连接字符串中，我刚刚添加了 Allow User Variables = True，它现在可以工作了!