Question

尝试在存储过程中运行以下代码：

CASE
    WHEN recordNotes=null AND sortNumber=null
        THEN INSERT INTO tempRecordHolder (union_ID,union_Name) VALUES (recordID, recordName);
    ELSE SET @blank="null";
END CASE;

＆＃34; recordNotes＆＃34;，＆＃34; sortNumber＆＃34;，＆＃34; recordID＆＃34;，＆＃34; recordName＆＃34;是传递给存储过程的变量。我的目标是让它将INSERT语句运行到我在函数开头创建的tempRecordHolder表中。但出于某种原因，它表示＆＃34;在CASE之后意外发生。＆＃34;有任何想法吗？谢谢。

完整代码，请忽略评论并注释掉代码。这是所有正在研究的东西。案例在第34-41行：

CREATE DEFINER=`apf15102`@`%` PROCEDURE `sp_cu_LookUpTbls`(
    IN tbl_Name varchar(50),
    recordID int,
    recordName varChar(500),
    # REMEMBER THERE IS A DATE BETWEEN THESE TWO FIELDS IN THE TABLE STRUCTURES
    recordNotes longtext,
    sortNumber int,
    recordAlreadyExists bit
)
BEGIN

    #-------------------------------#
    # Begin preliminary table setup #
    #-------------------------------#

    # Begin by dropping my temp table
    DROP TEMPORARY TABLE IF EXISTS tempRecordHolder;

    # set my session variable equal to my passed in table name
    SET @tblName = tbl_Name;

    # create a session variable string that is the create table for the table that was passed in
    SET @tbl_Create_Command = concat("CREATE TEMPORARY TABLE tempRecordHolder LIKE " , @tblName);

    # prepare the statement making it one string that can be executed then execute it
    prepare stmtCreate FROM @tbl_Create_Command;
    execute stmtCreate;

    #-----------------------------#
    # End preliminary table setup #
    #-----------------------------#


    # This code right here gives a "Syntax Error: Unexpected WHEN (when)" if it is un-commented
    /*
    CASE
        WHEN recordNotes IS NULL AND sortNumber IS NULL
            THEN INSERT INTO tempRecordHolder (union_ID,union_Name) VALUES (recordID, recordName);
        ELSE SET @blank="null";
    END CASE;
    */

    IF recordAlreadyExists = FALSE 
        THEN
            #-----------------------------------------------------------------#
            # Begin procedure for if the record DOES NOT exist in our records #
            #-----------------------------------------------------------------#
            IF sortNumber IS NULL
                THEN
                    INSERT INTO tempRecordHolder VALUES (recordID, recordName, curdate(), recordNotes);
            END IF;
            IF sortNumber IS NOT NUll
                THEN
                    INSERT INTO tempRecordHolder VALUES (recordID, recordName, curdate(), recordNotes, sortNumber);
            END IF;
            #---------------------------------------------------------------#
            # End procedure for if the record DOES NOT exist in our records #
            #---------------------------------------------------------------#
        ELSE  
            #-------------------------------------------------------------#
            # Begin procedure for if the record DOES exist in our records #
            #-------------------------------------------------------------#
            IF recordAlreadyExists = TRUE 
                THEN
                    SET @elsevar = null;
            END IF;
            #-----------------------------------------------------------#
            # END procedure for if the record DOES exist in our records #
            #-----------------------------------------------------------#
    END IF;
    /*
    #-----------------------------#
    # Begin data processing setup #
    #-----------------------------#

    # Declare all the necessary variables for making a cursor
    DECLARE finished BOOLEAN DEFAULT FALSE;
    DECLARE colNameForInsert varChar(50);
    DECLARE columnName CURSOR FOR
        (
            SELECT `COLUMN_NAME` 
            FROM `INFORMATION_SCHEMA`.`COLUMNS` 
            WHERE `TABLE_NAME`='tempRecordHolder';
        );
    DECLARE CONTINUE HANDLER 
        FOR NOT FOUND SET finished = TRUE;

    #---------------------------#
    # END data processing setup #
    #---------------------------#

    #--------------------------------#
    # Begin main loop and processing #
    #--------------------------------#

    OPEN columnName;
    manFunc: loop

        # check to see if we are done before running the rest of the loop
        IF finished = TRUE THEN
            LEAVE mainFunc;
        END IF;
        FETCH columnName INTO colNameForInsert;

        IF 

    END LOOP mainFunc;
    CLOSE columnName;

    #------------------------------#
    # END main loop and processing #
    #------------------------------#

    */

END

Answer 1

case表达式返回一个值。您无法使用它将值插入表中。我认为你需要IF/ELSE。

IF recordNotes is null AND sortNumber is null
THEN INSERT INTO tempRecordHolder (union_ID,union_Name) VALUES (recordID, recordName);
ELSE SET @blank='null';
END IF;

与null（= null或＆lt;＆gt; null）的比较也总是返回unknown。使用is null。

CASE声明怎么说＆＃34;在案例之后出乎意料＆＃34;？

1 个答案: