我已经在MySQL(服务器5.5)中编写了此过程
I have written this procedure in MySQL (Server 5.5)
DELIMITER $$ DROP PROCEDURE IF EXISTS `InsertList` $$ CREATE DEFINER=`root`@`localhost` PROCEDURE `InsertList`(IN fName VARCHAR(20), IN fType VARCHAR(3), IN fFood varchar(20), Out fResult int) BEGIN insert into tblguest (firstname, confirm, food) values (fName, fType, fFood); select count(id) from tblguest into fResult; END $$ DELIMITER ;当我从MySQL查询浏览器调用此过程时,它会按预期返回
When I call this procedure from MySQL Query Browser it returns as expected
Call InsertList ('V1', 'No', 'F1', @result); Select @result;->它成功返回表中ID的数量
--> It successfully returns the count of the ids in the table
我在VB6中编写了以下代码
I wrote the following code in VB6
Dim res As Integer On Error GoTo chkErr Set cmd = New ADODB.Command cmd.ActiveConnection = cn cmd.CommandType = adCmdStoredProc cmd.CommandText = "InsertList" cmd.Parameters.Append cmd.CreateParameter("fName", adVarChar, adParamInput, 20, Text3.Text) cmd.Parameters.Append cmd.CreateParameter("fType", adVarChar, adParamInput, 3, Text2.Text) cmd.Parameters.Append cmd.CreateParameter("fFood", adVarChar, adParamInput, 20, Text1.Text) cmd.Parameters.Append cmd.CreateParameter("fResult", adInteger,adParamOutput) cmd.Execute res = cmd("fResult") MsgBox res Exit Sub chkErr: Select Case Err.Number Case Else Text4.Text = Err.Number & " - " & Err.Description End Select但是当它尝试运行语句cmd.execute时,会引发以下错误:
But the moment it tries to run the statement cmd.execute it throws the following error :
-2147467259-[MySQL] [ODBC 5.1驱动程序] [mysqld-5.5.34]例程dbtest.InsertList的OUT或INOUT参数4不是变量或NEW 触发前的伪变量
-2147467259 - [MySQL][ODBC 5.1 Driver][mysqld-5.5.34]OUT or INOUT argument 4 for routine dbtest.InsertList is not a variable or NEW pseudo-variable in BEFORE trigger
我已经看到了适用于SQL的代码,那么MySQL本身在使用带有OUT参数的存储过程时是否会遇到问题?
I have seen codes working for SQL, so is it that MySQL itself has an issue using Stored Procedure with an OUT Parameter?
推荐答案这似乎是来自MySQL ODBC和C/API的未解决的错误
It seems a unsolved bug from MySQL ODBC and C/API
一种解决方案是使用带有准备好的变量的SQL命令执行该操作:
One solution is to execute that using a SQL command with prepared variables:
Dim rs As ADODB.Recordset Set cmd = New ADODB.Command cmd.ActiveConnection = cn cmd.CommandType = adCmdText cmd.CommandText = "call InsertList(?,?,?,@fResult)" cmd.Parameters.Append cmd.CreateParameter("fName", adVarChar, adParamInput, 20, Text3.Text) cmd.Parameters.Append cmd.CreateParameter("fType", adVarChar, adParamInput, 3, Text2.Text) cmd.Parameters.Append cmd.CreateParameter("fFood", adVarChar, adParamInput, 20, Text1.Text) cmd.Execute 'And after that, using the same connection, get the value of '@fResult from a single query: Set rs = cn.Execute("select @fResult as fResult") MsgBox rs!fResult您将获得期望值.
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使用带有OUT参数的VB6调用MySQL存储过程
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