oracle 临时表和动态SQL

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create or replace procedure sp_tmp_test(v_col1 in varchar2,v_col2 in varchar2)
as
v_num                  NUMBER;
v_char                 varchar2(10);
sql_text               varchar2(2000);
sql_text1              varchar2(2000);
notes                  varchar2(500);
p_nError               NUMBER;
V_ERROR_MESSAGE        VARCHAR2(500);

BEGIN
select count(*) into v_num from user_tables where table_name='T_TEMP';

--create temporary table
execute immediate 'CREATE GLOBAL TEMPORARY TABLE T_TEMP (
COL1 VARCHAR2(10),
COL2 VARCHAR2(10)
) ON COMMIT delete ROWS';

--insert data
sql_text:='insert into t_temp values(:1,:2)';
execute immediate sql_text using v_col1,v_col2;
--sql_text1:='select col1 into :1 from t_temp ';
--execute immediate sql_text1 using v_num;
--select col1 into v_num from t_temp;
execute immediate 'select col1 from t_temp' into v_char;

dbms_output.put_line(v_char);
execute immediate 'delete from t_temp';
commit;
execute immediate 'drop table t_temp';
EXCEPTION
    WHEN OTHERS THEN
    execute immediate 'drop table t_temp';
    p_nError        := SQLCODE;
    V_ERROR_MESSAGE := sqlerrm;
    dbms_output.put_line('error: ' || p_nError || ' ' || sqlerrm(p_nError));
END;