PG存储过程实例

CREATE TABLE accounts (
    id INT GENERATED BY DEFAULT AS IDENTITY,
    name VARCHAR(100) NOT NULL,
    balance DEC(15,2) NOT NULL,
    PRIMARY KEY(id)
);
 
INSERT INTO accounts(name,balance)
VALUES('Bob',10000);
 
INSERT INTO accounts(name,balance)
VALUES('Alice',10000);

select * from accounts;

CREATE OR REPLACE PROCEDURE transfer(INT, INT, DEC)
LANGUAGE plpgsql    
AS $$
BEGIN
    -- subtracting the amount from the sender's account 
    UPDATE accounts 
    SET balance = balance - $3
    WHERE id = $1;
 
    -- adding the amount to the receiver's account
    UPDATE accounts 
    SET balance = balance + $3
    WHERE id = $2;
 
    COMMIT;
END;
$$;


call transfer(1,2,1000);
select * from accounts;

参考：
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