Teradata Parallel Transporter DDL 运算符 - 规则中缺少 { EXTENDED_LITERAL_ CHAR_STRING_LITERAL_ }：字符串文字错误

Question

我想做的是在我的数据库中检查我的 table 是否存在，如果存在则删除它。这是我的 .tpt :

DEFINE JOB DELETE_ET_TABLES
DESCRIPTION 'Delete ET tables'
(
        DEFINE OPERATOR DDL_OPERATOR
          DESCRIPTION 'Teradata Parallel Transporter DDL Operator'
          TYPE DDL
          ATTRIBUTES
          (
                varchar TdpId = @TERADATA_TDP,
                varchar UserName = @User,
                varchar UserPassword = @Pwd
          );

        APPLY  
                'SELECT (CASE WHEN TableName = ''Test_Del'' 
                              THEN (''DROP TABLE @Table;'')
                              ELSE NULL
                         END)
                 FROM dbc.TablesV WHERE databasename = @Db;'  TO OPERATOR(DDL_OPERATOR);

这是我收到的错误消息：

Running "tbuild" command: tbuild -f /$HOME/loaders/test_deleteETTables.tpt -u TERADATA_TDP=$TDP, TERADATA_DATABASE=$DB -L /$LOG/
Teradata Parallel Transporter Version 16.20.00.09 64-Bit
TPT_INFRA: Syntax error at or near line 18 of Job Script File '/$HOME/loaders/test_deleteETTables.tpt':
TPT_INFRA: At "(" missing { EXTENDED_LITERAL_ CHAR_STRING_LITERAL_ } in Rule: Character String Literal
Compilation failed due to errors. Execution Plan was not generated.

你有什么想法吗？我尝试了多种方法，例如：

SELECT 1 FROM dbc.TablesV WHERE databasename = @Db AND TABLENAME ='TEST_DEL';
CASE WHEN ACTIVITYCOUNT = 1
    THEN (DROP TABLE @Table)
    ELSE ( QUIT )
END;

我的所有变量都已声明。我觉得在 que 语句中使用单引号是个问题，但我不确定，也不知道如何解决。非常感谢您的宝贵时间。

Answer 1

Fred 在评论中推荐我尝试的解决方案效果很好：

I think this is due to use of NULL but SELECT is not valid for DDL operator. The recommended way to do this is simply pass a DROP to the operator and tell it to ignore "not found" (and consider that success), i.e. ErrorList='3807'

DESCRIPTION 'Delete ET tables'
(
        DEFINE OPERATOR DDL_OPERATOR
          DESCRIPTION 'Teradata Parallel Transporter DDL Operator'
          TYPE DDL
          ATTRIBUTES
          (
                varchar TdpId = @TERADATA_TDP,
                varchar UserName = @USERDB,
                varchar UserPassword = @PWD,
                VARCHAR ErrorList = '3807'
          );

        APPLY
        ('DROP TABLE @TABLENAME')
        TO OPERATOR(DDL_OPERATOR);
);```

Teradata Parallel Transporter DDL 运算符 - 规则中缺少 { EXTENDED_LITERAL_ CHAR_STRING_LITERAL_ }：字符串文字错误

Teradata Parallel Transporter DDL Operator - missing { EXTENDED_LITERAL_ CHAR_STRING_LITERAL_ } in Rule: Character String Literal ERROR

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