[英]Oracle Bind Variables and Dynamic PL/SQL with Package
我不熟悉在包中使用动态SQL,并且在下面的代码片段的WHERE子句的左侧使用绑定变量时遇到了一个问题,特别是“ WHERE TRUNC(:parm_rec.SRC_DATE_COLUMN)”:
'WHERE TRUNC( :parm_rec.SRC_DATE_COLUMN ) < ADD_MONTHS( ' ||
'ADD_MONTHS ( TRUNC ( NVL ( TO_DATE ( :parm_rec.SYS_OFFSET ) , SYSDATE) - ( :parm_rec.DAY_OFFSET )), ' ||
我试图将“列名”作为绑定变量传递给创建日期,该列的名称在CREATEDATE,CREATE_DATE,LOAD_DATE等之间可能有所不同。
如果WHERE子句具有硬编码的实际列名(在此特定情况下为CREATEDATE),并且所有其他绑定变量似乎都绑定到其相应的标识符,则动态SQL执行不会出现问题。 parm_rec.SRC_DATE_COLUMN
变量的数据类型为VARCHAR2。
当执行失败时,我没有收到特定的错误消息。 仅代码失败的行如下:
EXECUTE IMMEDIATE arc_sql USING seq_val, parm_rec.SRC_DATE_COLUMN, parm_rec.SYS_OFFSET, parm_rec.DAY_OFFSET, parm_rec.MON_OFFSET, kNEGATIVE, parm_rec.YR_OFFSET, kANNUM;
我已经用尽了所有的研究选择,试图找出无法解决问题的原因。 我以为这是我做错的事情,但我无法弄清楚这是什么。
我将以下整个过程包括在内:
PROCEDURE ArchiveDynamic
IS
BEGIN
DBMS_OUTPUT.PUT_LINE('ArchiveDynamic - ENTER');
FOR i in tbl_cur
LOOP
/*** DYNAMIC SQL DECLARATIONS ***/
arc_sql := 'DECLARE ' ||
/*** DYNAMIC %ROWTYPE SELECT ***/
'CURSOR arc_cur IS ' ||
'SELECT * '||
'FROM ' || i.ARC_TABLE_NAME || '; '|| --obtain ARCHIVE ARC_SCHEMA_NAME.ARC_TABLE_NAME
'TYPE arc_cur_type IS TABLE OF arc_cur%ROWTYPE; ' || -- dynamically set archive record cursor %ROWTYPE for BULK COLECT as table collection
'arc_rec arc_cur_type; ' || -- define archive record as TABLE OF cursor.%ROWTYPE
/*** ARCHIVE PARAMETERS CURSOR ***/
'CURSOR parm_cur IS '||
'SELECT :seq_val AS ARCHIVE_ID, '||
'A.*, ' ||
'SYSDATE AS ARCHIVE_DATE ' ||
'FROM ' || srcSchemaTable || ' A ' || -- archive SRC_SCHEMA_NAME.SRC_TABLE_NAME (source table not archive table)
'WHERE TRUNC( :parm_rec.SRC_DATE_COLUMN ) < ADD_MONTHS( ' ||
'ADD_MONTHS ( TRUNC ( NVL ( TO_DATE ( :parm_rec.SYS_OFFSET ) , SYSDATE) - ( :parm_rec.DAY_OFFSET )), ' ||
'( :parm_rec.MON_OFFSET * :kNEGATIVE ) ), ' ||
'( :parm_rec.YR_OFFSET * ( :kANNUM * :kNEGATIVE ) ) ); ' ||
/*** DYNAMIC SQL STATEMENT BODY ***/
'BEGIN '||
'IF parm_cur%ISOPEN THEN CLOSE parm_cur; ' ||
'END IF; ' ||
'OPEN parm_cur; ' ||
'LOOP ' ||
'FETCH parm_cur ' ||
'BULK COLLECT INTO arc_rec LIMIT 500; ' ||
'EXIT WHEN arc_rec.COUNT = 0; ' ||
'FORALL i IN 1..arc_rec.COUNT ' ||
'INSERT INTO ' || arcTable ||
' VALUES arc_rec( i );' ||
'DBMS_OUTPUT.PUT_LINE( ''ARC_REC_COUNT: '' || arc_rec.COUNT ); ' ||
'END LOOP; ' ||
'CLOSE parm_cur; ' ||
'dbms_output.put_line(''SUCCESS...''); '||
'END; ';
DBMS_OUTPUT.PUT_LINE('ArchiveDynamic - INSIDE LOOP: ' || arc_sql );
EXECUTE IMMEDIATE arc_sql USING seq_val, parm_rec.SRC_DATE_COLUMN, parm_rec.SYS_OFFSET, parm_rec.DAY_OFFSET, parm_rec.MON_OFFSET, kNEGATIVE, parm_rec.YR_OFFSET, kANNUM;
END LOOP;
END ArchiveDynamic
您可以提供的任何帮助将不胜感激。
谢谢!
按照Kaushik Nayak的建议,将以下代码更改为使用文字串联而不是绑定变量:
'WHERE TRUNC( ' || parm_rec.SRC_DATE_COLUMN || ' ) < ADD_MONTHS( ' || 'ADD_MONTHS ( TRUNC ( NVL ( TO_DATE ( :parm_rec.SYS_OFFSET ) , SYSDATE) - ( :parm_rec.DAY_OFFSET )), ' || '( :parm_rec.MON_OFFSET * :kNEGATIVE ) ), ' || '( :parm_rec.YR_OFFSET * ( :kANNUM * :kNEGATIVE ) ) ); ' ||
完整的程序代码在这里:
PROCEDURE ArchiveDynamic
IS
BEGIN
DBMS_OUTPUT.PUT_LINE('ArchiveDynamic - ENTER');
FOR i in tbl_cur
LOOP
/*** DYNAMIC SQL DECLARATIONS ***/
arc_sql := 'DECLARE ' ||
/*** DYNAMIC %ROWTYPE SELECT ***/
'CURSOR arc_cur IS ' ||
'SELECT * '||
'FROM ' || i.ARC_TABLE_NAME || '; '|| --obtain ARCHIVE ARC_SCHEMA_NAME.ARC_TABLE_NAME
'TYPE arc_cur_type IS TABLE OF arc_cur%ROWTYPE; ' || -- dynamically set archive record cursor %ROWTYPE for BULK COLECT as table collection
'arc_rec arc_cur_type; ' || -- define archive record as TABLE OF cursor.%ROWTYPE
/*** ARCHIVE PARAMETERS CURSOR ***/
'CURSOR parm_cur IS '||
'SELECT :seq_val AS ARCHIVE_ID, '||
'A.*, ' ||
'SYSDATE AS ARCHIVE_DATE ' ||
'FROM ' || srcSchemaTable || ' A ' || -- archive SRC_SCHEMA_NAME.SRC_TABLE_NAME (source table not archive table)
'WHERE TRUNC( ' || parm_rec.SRC_DATE_COLUMN || ' ) < ADD_MONTHS( ' ||
'ADD_MONTHS ( TRUNC ( NVL ( TO_DATE ( :parm_rec.SYS_OFFSET ) , SYSDATE) - ( :parm_rec.DAY_OFFSET )), ' ||
'( :parm_rec.MON_OFFSET * :kNEGATIVE ) ), ' ||
'( :parm_rec.YR_OFFSET * ( :kANNUM * :kNEGATIVE ) ) ); ' ||
/*** DYNAMIC SQL STATEMENT BODY ***/
'BEGIN '||
'IF parm_cur%ISOPEN THEN CLOSE parm_cur; ' ||
'END IF; ' ||
'OPEN parm_cur; ' ||
'LOOP ' ||
'FETCH parm_cur ' ||
'BULK COLLECT INTO arc_rec LIMIT 500; ' ||
'EXIT WHEN arc_rec.COUNT = 0; ' ||
'FORALL i IN 1..arc_rec.COUNT ' ||
'INSERT INTO ' || arcTable ||
' VALUES arc_rec( i );' ||
'DBMS_OUTPUT.PUT_LINE( ''ARC_REC_COUNT: '' || arc_rec.COUNT ); ' ||
'END LOOP; ' ||
'CLOSE parm_cur; ' ||
'dbms_output.put_line(''SUCCESS...''); '||
'END; ';
DBMS_OUTPUT.PUT_LINE('ArchiveDynamic - INSIDE LOOP: ' || arc_sql );
EXECUTE IMMEDIATE arc_sql USING seq_val, parm_rec.SYS_OFFSET, parm_rec.DAY_OFFSET, parm_rec.MON_OFFSET, kNEGATIVE, parm_rec.YR_OFFSET, kANNUM;
END LOOP;
END ArchiveDynamic
谢谢您的帮助!
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