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oracle刪除表，如果表不存在，就報錯，在跑大型腳本（腳本長且耗時的時候）比較麻煩，一般希望的是點(diǎn)開始然后腳本運(yùn)行到結(jié)束，不可能一直盯著屏幕等彈出提示手工點(diǎn)掉，mysql就很好有drop table if not exist功能 CREATE OR REPLACE PROCEDURE p_drop_table_if_exist(p_vc2_tbl_name IN all_tables.table_name%TYPE,
p_vc2_tbl_owner IN all_tables.owner%TYPE DEFAULT USER) IS
v_num_tbl_count NUMBER(4);
v_vc2_sql_stmt VARCHAR2(1000);
BEGIN
-- Check if table already exists
p_chk_table_exist(p_vc2_tbl_name, p_vc2_tbl_owner, v_num_tbl_count);
IF (v_num_tbl_count != 0) THEN
-- Table already exists and must be dropped
v_vc2_sql_stmt := 'DROP TABLE ' || CASE
WHEN p_vc2_tbl_owner IS NOT NULL THEN
p_vc2_tbl_owner || '.'
END || p_vc2_tbl_name || ' purge'
;
--dbms_output.put_line(v_vc2_sql_stmt);
EXECUTE IMMEDIATE v_vc2_sql_stmt;
END IF;
END;
CREATE OR REPLACE PROCEDURE p_chk_table_exist(p_vc2_tbl_name IN all_tables.table_name%TYPE,
p_vc2_tbl_owner IN all_tables.owner%TYPE DEFAULT USER,
p_num_tbl_count OUT NUMBER -- 1 if table exists, 0 if it doesn't
) IS
v_vc2_tbl_name all_tables.table_name%TYPE := UPPER(p_vc2_tbl_name);
BEGIN
IF p_vc2_tbl_owner IS NOT NULL THEN
SELECT COUNT(1)
INTO p_num_tbl_count
FROM all_tables
WHERE table_name = v_vc2_tbl_name
AND owner = UPPER(p_vc2_tbl_owner);
ELSE
SELECT COUNT(1)
INTO p_num_tbl_count
FROM user_tables
WHERE table_name = v_vc2_tbl_name;
END IF;
END p_chk_table_exist;
have fun |
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