云数据库 GAUSSDB-动态调用匿名块:示例

时间：2024-11-13 14:45:38

云数据库 GAUSSDB 动态语句

示例

gaussdb=# DROP SCHEMA IF EXISTS hr CASCADE;
gaussdb=# CREATE SCHEMA hr;
CREATE SCHEMA
gaussdb=# SET CURRENT_SCHEMA = hr;
SET
gaussdb=# CREATE TABLE staffs 
(
  staff_id NUMBER, 
  first_name VARCHAR2,
  salary NUMBER
);
CREATE TABLE
gaussdb=# INSERT INTO staffs VALUES (200, 'mike', 5800);
INSERT 0 1
gaussdb=# INSERT INTO staffs VALUES (201, 'lily', 3000);
INSERT 0 1
gaussdb=# INSERT INTO staffs VALUES (202, 'john', 4400);
INSERT 0 1

--创建重载函数
gaussdb=# CREATE OR REPLACE PACKAGE pkg1 
IS
   PROCEDURE plus(var1 in int, var2 int, var3 out int);
   PROCEDURE plus(var1 in out int);
END pkg1;
/
CREATE PACKAGE
gaussdb=# CREATE OR REPLACE PACKAGE BODY pkg1 IS
   PROCEDURE plus(var1 in int, var2 int, var3 out int) 
   AS
   BEGIN 
      var3 = var1 + var2 + 1;
   END;
   PROCEDURE plus(var1 in out int) 
   AS 
   BEGIN
      var1 = var1 + 1;
   END;
END pkg1;
/
CREATE PACKAGE BODY

--创建存储过程dynamic_proc
gaussdb=# CREATE OR REPLACE PROCEDURE dynamic_proc
AS
   staff_id     NUMBER(6) := 200;
   first_name   VARCHAR2(20);
   salary       NUMBER(8,2);
BEGIN
    --执行匿名块 
    EXECUTE IMMEDIATE 'begin select first_name, salary into :first_name, :salary from hr.staffs where staff_id= :dno; end;'
       USING OUT first_name, OUT salary, IN staff_id;
   dbe_output.print_line(first_name|| ' ' || salary);
END;
/
CREATE PROCEDURE
--创建存储过程调用重载函数
gaussdb=# CREATE OR REPLACE PROCEDURE dynamic_proc1 
AS
     v_sql  VARCHAR2(200);
     var1   NUMBER(6) := 1;
     var2   NUMBER(6) := 2;
     var3   NUMBER(6);
BEGIN
     v_sql := 'begin pkg1.plus(:1, :2, :3); end;';
     EXECUTE IMMEDIATE v_sql USING var1, var2, out var3;
     dbe_output.print_line('var3: ' || var3);
END;
/
CREATE PROCEDURE

--调用存储过程
gaussdb=# CALL dynamic_proc();
mike 5800.00
 dynamic_proc 
--------------

(1 row)
gaussdb=# CALL dynamic_proc1();
var3: 4
 dynamic_proc1 
---------------

(1 row)
--删除存储过程
gaussdb=# DROP PROCEDURE dynamic_proc;
DROP PROCEDURE
gaussdb=# DROP PROCEDURE dynamic_proc1;
DROP PROCEDURE

--开启dynamic_sql_check时报错示例
gaussdb=# SET behavior_compat_options = 'dynamic_sql_check';
SET
gaussdb=# CREATE OR REPLACE PROCEDURE test_proc_exception001(a out integer, b inout integer, c integer) 
as 
BEGIN
 a := 1; 
 begin b := 1/0; end; 
EXCEPTION
 WHEN others THEN
  b := 2; 
END;
/
CREATE PROCEDURE
gaussdb=# 
DECLARE 
 a integer := 1; 
 c integer; 
BEGIN
  execute immediate 'begin test_proc_exception001(:1,:2,:1); end;' using in out a, out c, a; 
END;
/
ERROR:  argnum not match in Dynamic SQL, using args num : 3 , actual sql args num : 2
CONTEXT:  PL/pgSQL function inline_code_block line 4 at EXECUTE statement
--修改同名占位符
gaussdb=# 
DECLARE 
 a integer := 1; 
 c integer; 
BEGIN
  execute immediate 'begin test_proc_exception001(:1,:2,:3); end;' using in out a, out c, a; 
END;
/
ANONYMOUS BLOCK EXECUTE
gaussdb=# DROP PROCEDURE test_proc_exception001;
DROP PROCEDURE