Question

我试图将IF / ELSE语句放入存储过程。

CREATE PROCEDURE [dbo].[Sp_enty_srch_attr_vals] 
    (@ENTY_ID  INT,
     @FIELD_ID INT,
     @VALUE VARCHAR(5000),
     @SQL VARCHAR(5000)
    )
AS
BEGIN
    IF (@FIELD_ID = 148)
        SET nocount ON;

        SET @SQL = 'SELECT DISTINCT [GPI] FROM [GPI_ASOC] WHERE [GPI] LIKE ''%@VALUE%'' ORDER BY GPI';
        SET @SQL = replace(@SQL, '@VALUE', @VALUE);

        EXEC SP_EXECUTESQL @SQL;

    ELSE
        SET nocount ON;
        DECLARE @ENTY_TABLE_NAME VARCHAR(500)

        SET @ENTY_TABLE_NAME = (SELECT TOP 1 enty_table_name
                                FROM enty
                                WHERE enty.enty_id = @ENTY_ID)

        EXEC( 'SELECT DISTINCT ATTR_VAL  FROM '+@ENTY_TABLE_NAME+'_ATTR WHERE FIELD_ID='+@FIELD_ID+
      ' AND ATTR_VAL LIKE ''%'+@VALUE+'%'' ORDER BY ATTR_VAL ' )
END

我收到了这个错误，我一直在试图解决它的问题。

消息156，级别15，状态1，过程Sp_enty_srch_attr_vals，第14行[批次启动第17行]
关键字“ELSE”附近的语法不正确。

这个脚本有什么问题？

Answer 1

如果IF条件中有多个语句，则需要使用BEGIN-END块

If <<condition>>
BEGIN 
  <<stmt 1>>
  <<stmt 2>>
END
ELSE
BEGIN 
  <<stmt 3>>
  <<stmt 4>>
END

也不要将sp_添加到存储过程的前缀。所有系统存储过程都将以sp_为前缀。这是关于问题的文章

Should I Use the sp_ Prefix for Procedure Names?

Is the sp_ prefix still a no-no?

Answer 2

您需要BEGIN和END才能将代码包含在IF / ELSE的正文中。您也可以将SET NOCOUNT ON移到IF之外：

CREATE PROCEDURE [dbo].[Enty_srch_attr_vals] (@ENTY_ID  INT,
                                              @FIELD_ID INT,
                                              @VALUE    VARCHAR(5000),
                                              @SQL      VARCHAR(5000))
AS
BEGIN
    SET nocount ON;
      IF( @FIELD_ID = 148 )
      BEGIN
        SET @SQL = 'SELECT DISTINCT [GPI] FROM [GPI_ASOC] WHERE [GPI] LIKE ''%@VALUE%'' ORDER BY GPI';
        SET @SQL = replace(@SQL, '@VALUE', @VALUE);
        EXEC SP_EXECUTESQL @SQL;
      END
      ELSE
      BEGIN
        DECLARE @ENTY_TABLE_NAME VARCHAR(500)
        SET @ENTY_TABLE_NAME = (SELECT TOP 1 enty_table_name
                                FROM   enty
                                WHERE  enty.enty_id = @ENTY_ID)

        EXEC( 'SELECT DISTINCT ATTR_VAL  FROM '+@ENTY_TABLE_NAME+'_ATTR WHERE FIELD_ID='+@FIELD_ID+
      ' AND ATTR_VAL LIKE ''%'+@VALUE+'%'' ORDER BY ATTR_VAL ' )
      END
END

go

Answer 3

对于多行IF / ELSE语句，您应该使用BEGIN / END块，例如

  IF( @FIELD_ID = 148 )
   BEGIN
    SET nocount ON;
    SET @SQL = 'SELECT DISTINCT [GPI] FROM [GPI_ASOC] WHERE [GPI] LIKE ''%@VALUE%'' ORDER BY GPI';
    SET @SQL = replace(@SQL, '@VALUE', @VALUE);
    EXEC SP_EXECUTESQL @SQL;
   END

存储过程中的IF和ELSE

3 个答案: