PostgreSQL存储过程初探
Postgresql的存储过程语法结构如下:CREATE OR REPLACE FUNCTION 函数名(参数1,[整型 int4, 整型数组 _int4, hellip;])
什么是存储过程, 百度百科是这么定义的:存储过程(Stored Procedure)是在大型数据库系统中,一组为了完成特定功能的SQL 语句集,存储在数据库中经过第一次编译后再次调用不需要再次编译,用户通过指定存储过程的名字并给出参数(如果该存储过程带有参数)来执行它。存储过程是数据库中的一个重要对象,任何一个设计良好的数据库应用程序都应该用到存储过程。
Postgresql的存储过程语法结构如下:
CREATE OR REPLACE FUNCTION 函数名(参数1,[整型 int4, 整型数组 _int4, …])
RETURNS 返回值类型 AS
$BODY$
DECLARE
变量声明
BEGIN
函数体
END;
$BODY$
LANGUAGE ‘plpgsql’ VOLATILE;
下面的例子是要调用一个存储过程自动创建对应的一系列表:
CREATE OR REPLACE FUNCTION create_table_for_client(id int)
RETURNS integer AS
$BODY$
DECLARE
num int4 := 0;
sql "varchar";
BEGIN
sql := 'create table _' || id || '_company(id int, name text)';
EXECUTE sql;
sql := 'create table _' || id || '_employee(id int, name text)';
EXECUTE sql;
sql := 'create table _' || id || '_sale_bill(id int, name text)';
EXECUTE sql;
.......
return num;
END;
$BODY$ LANGUAGE plpgsql VOLATILE
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PostgreSQL 的详细介绍:请点这里
PostgreSQL 的下载地址:请点这里
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