DB2 函数错误

Question

下面的 DB2 函数有什么问题？

CREATE FUNCTION MIGRATION.determineToTaxService
(DIGI_NAAR_VLG CHAR, DIGI_VAN_VLG CHAR, NAARVLG CHAR)
RETURNS CHAR
BEGIN ATOMIC
    DECLARE returnValue CHAR;
    SET returnValue = '0';

    IF (DIGI_NAAR_VLG = '1') THEN
        SET returnValue = '1';

    ELSEIF (DIGI_VAN_VLG = '1') THEN
        SET returnValue = '1';

    ELSEIF (NAARVLG = '1') THEN
        SET returnValue = '1';
    END IF;

    RETURN returnValue;
END;

我收到此错误：

An unexpected token "CHAR" was found following " DECLARE returnValue".  Expected tokens may   include:  "END-OF-STATEMENT". SQL Code: -104, SQL State: 42601
Error occured in:
CREATE FUNCTION MIGRATION.determineToTaxService
   (DIGI_NAAR_VLG CHAR, DIGI_VAN_VLG CHAR,
    NAARVLG CHAR)
RETURNS CHAR
BEGIN ATOMIC
    DECLARE returnValue CHAR

我真的想不通。如果我删除 if 和 elsif 语句，它也不会运行，所以问题不应该存在。

Answer 1

终止字符错误：

CREATE FUNCTION MIGRATION.determineToTaxService
(DIGI_NAAR_VLG CHAR, DIGI_VAN_VLG CHAR, NAARVLG CHAR)
RETURNS CHAR
BEGIN ATOMIC
    DECLARE returnValue CHAR;
    SET returnValue = '0';

    IF (DIGI_NAAR_VLG = '1') THEN
        SET returnValue = '1';

    ELSEIF (DIGI_VAN_VLG = '1') THEN
        SET returnValue = '1';

    ELSEIF (NAARVLG = '1') THEN
        SET returnValue = '1';
    END IF;

    RETURN returnValue;
END @

你可以像这样从命令行调用它：

db2 -td@ -vf test

Answer 2

一个技巧是用如下注释结束行：

CREATE FUNCTION MIGRATION.determineToTaxService
    (DIGI_NAAR_VLG CHAR, DIGI_VAN_VLG CHAR, NAARVLG CHAR)
RETURNS CHAR
BEGIN ATOMIC
    DECLARE returnValue CHAR; --
    SET returnValue = '0'; --

    IF (DIGI_NAAR_VLG = '1') THEN
        SET returnValue = '1'; --

    ELSEIF (DIGI_VAN_VLG = '1') THEN
        SET returnValue = '1'; --

    ELSEIF (NAARVLG = '1') THEN
        SET returnValue = '1'; --
    END IF; --

    RETURN returnValue; --
END ;

然后你可以继续使用;作为语句终止符

您可能想要简化函数，例如：

CREATE FUNCTION MIGRATION.determineToTaxService
    (DIGI_NAAR_VLG CHAR, DIGI_VAN_VLG CHAR, NAARVLG CHAR)
RETURNS CHAR
RETURN
    CASE WHEN DIGI_NAAR_VLG = '1' THEN '1'
         WHEN DIGI_VAN_VLG = '1' THEN '1'
         WHEN NAARVLG = '1' THEN '1'
         ELSE '0'
    END

应该这样做