103 lines
2.2 KiB
MySQL
103 lines
2.2 KiB
MySQL
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CREATE LOGIN Chat
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WITH PASSWORD = '123456';
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GO
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DROP DATABASE Chat;
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GO
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CREATE DATABASE Chat;
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GO
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USE Chat;
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GO
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CREATE USER Chat
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FOR LOGIN Chat;
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GO
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ALTER ROLE db_owner ADD MEMBER Chat;
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GO
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CREATE TABLE Account
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(
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Id BIGINT PRIMARY KEY IDENTITY(1000,1),
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Password VARCHAR(50) not null,
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NetName NVARCHAR(50) ,
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State BIT default 0 CHECK(State=1 or State=0),
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UpDataTime datetime default GETDATE()
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)
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GO
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CREATE TABLE Contacts
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(
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UserId BIGINT REFERENCES Account(Id) not null ,
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ContactsId BIGINT REFERENCES Account(Id) not null,
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State BIT default 0 CHECK(State=1 or State=0),
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Remark NVARCHAR(50),
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UpDataTime datetime default GETDATE()
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)
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GO
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CREATE TABLE History
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(
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Send BIGINT REFERENCES Account(Id) NOT NULL,
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Receive BIGINT REFERENCES Account(Id) NOT NULL,
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Type NVARCHAR(50) NOT NULL,
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Content NVARCHAR(200) NOT NULL,
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Time DATETIME DEFAULT GETDATE()
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)
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GO
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-- Account表的更新触发器
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CREATE TRIGGER trg_UpdateUpDataTimeAccount
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ON Account
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AFTER INSERT, UPDATE, DELETE
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AS
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BEGIN
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SET NOCOUNT ON;
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UPDATE Account
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SET UpDataTime = GETDATE()
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WHERE Id IN (SELECT Id FROM inserted UNION SELECT Id FROM deleted);
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END;
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GO
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-- Contacts表的更新触发器
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CREATE TRIGGER trg_UpdateUpDataTimeContacts
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ON Contacts
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AFTER INSERT, UPDATE
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AS
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BEGIN
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SET NOCOUNT ON;
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-- 更新Account表中的UpDataTime字段，仅在Contacts相关记录发生插入或更新时
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UPDATE Account
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SET UpDataTime = GETDATE()
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WHERE Id IN (SELECT UserId FROM inserted)
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OR Id IN (SELECT ContactsId FROM inserted);
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-- 更新Contacts表的Remark列为对应ContactsId的NetName
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UPDATE Contacts
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SET Remark = (SELECT NetName FROM Account WHERE Id = ContactsId)
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WHERE ContactsId IN (SELECT ContactsId FROM inserted)
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OR ContactsId IN (SELECT ContactsId FROM deleted);
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END;
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GO
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-- History表的更新触发器
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CREATE TRIGGER trg_UpdateUpDataTimeHistory
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ON History
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AFTER INSERT, UPDATE
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AS
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BEGIN
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SET NOCOUNT ON;
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-- 仅更新Account表中发送者和接收者的UpDataTime字段
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UPDATE Account
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SET UpDataTime = GETDATE()
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WHERE Id IN (SELECT Send FROM inserted)
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OR Id IN (SELECT Receive FROM inserted);
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END;
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GO
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