CREATE PROCEDURE example () LANGUAGE plpgsql AS $$ DECLARE a INTEGER := 1; b INTEGER := 2; c INTEGER; BEGIN c := a + b; END; $$; 在上面的代码中,我们声明了三个变量a、b和c,并将a和b初始化为1和2。存储过程的实现代码是将a和b相加,并将结果赋值给c。 5. 存储过程条件语句 存储过程...
POST http://www.example.com HTTP/1.1 Content-Type:multipart/form-data; boundary=---WebKitFormBoundaryrGKCBY7qhFd3TrwA ---WebKitFormBoundaryrGKCBY7qhFd3TrwA Content-Disposition: form-data; name="text" title ---WebKitFormBoundaryrGKCBY7qhFd3TrwA Content-Disposition: form-data; name="file"; filename...
procedure_demo$#BEGINprocedure_demo$# RAISE NOTICE'Procedure Parameter: %', msg ;procedure_demo$#END;procedure_demo$# $$ procedure_demo-# LANGUAGE plpgsql ;CREATEPROCEDUREprocedure_demo=#calldisplay_message('This is my test case');NOTICE: Procedure Parameter: This is my test case msg---This ...
shulanxtdb=#CREATETRIGGERexample_trigger AFTERINSERTONCOMPANYFOREACH ROWEXECUTEPROCEDUREauditlogfunc(); auditlogfunc() 是 PostgreSQL 一个程序,其定义如下: CREATEORREPLACEFUNCTIONauditlogfunc()RETURNSTRIGGERAS$example_table$BEGININSERTINTOAUDIT(EMP_ID, ENTRY_DATE)VALUES(new.ID,current_timestamp);RETURNNEW...
The next example shows a simple procedure: 1 2 3 4 5 6 7 8 9 10 11 12 db11=#CREATEPROCEDUREtest_proc() LANGUAGEplpgsql AS$$ BEGIN CREATETABLEa(aidint); CREATETABLEb(bidint); COMMIT; CREATETABLEc(cidint); ROLLBACK; END;
* ProcedureCreate * * Note: allParameterTypes, parameterModes, parameterNames, trftypes, and proconfig * are either arrays of the proper types or NULL. We declare them Datum, * not "ArrayType *", to avoid importing array.h into pg_proc.h. ...
createorreplacefunctionauditlogfunc()returnstriggeras$example_table$begininsertintoaudit(emp_id,entry_date)values(new.id,current_timestamp);returnnew;end$example_table$languageplpgsql; (3)创建触发器函数 create trigger example_trigger after insertoncompanyforeach row executeprocedureauditlogfunc(); ...
create it and set the privileges within a single transaction. For example: BEGIN; CREATE FUNCTION check_password(uname TEXT, pass TEXT) ... SECURITY DEFINER; REVOKE ALL ON FUNCTION check_password(uname TEXT, pass TEXT) FROM PUBLIC; GRANT EXECUTE ON FUNCTION check_password(uname TEXT, pass ...
CREATE FUNCTION – 创建触发器 postgres=# create trigger tg1 before insert ON t_ret for each row execute procedure tg_t_ret(); CREATE TRIGGER – 注意INSERT语句中values提供的id=1, 但是注意插入到表里的ID是2. 因此before for each row的返回值对插入行这个动作造成了影响. postgres=# insert into ...
CREATE TABLE users ( id SERIAL PRIMARY KEY, name VARCHAR(100), email VARCHAR(100) UNIQUE ); 对比:MySQL使用AUTO_INCREMENT,而PostgreSQL使用SERIAL来自动生成主键。 3. 插入数据 MySQL INSERT INTO users (name, email) VALUES ('Alice', 'alice@example.com'); ...