修改、删除被关联表数据都会出现障碍 关联之后,关联的数据不能修改 # 级联更新级联删除 建立从表: create table dep1( id int primary key auto_increment comment '编号', dep_name varchar(32) comment '部门名称', dep_desc varchar(32) comment '部门描述' ); 建立父表: create table emp1( id int ...
MONTH,HOUR,WEEKDAY等等 DATEDIFF(DAY,date1,date2) TIMESTAMPDIFF(DAY,date1,date2) 取两个日期时间差,同理有YEAR,MONTH,HOUR,WEEK等等 dateadd(MONTH,1,getdate()) DATE_ADD(NOW(),INTERVAL 1 MONTH) 日期增加,同理Year,DAY,Hour等,mysql日期相减函数DATE_SUB() identity(1,1) AUTO_INCREMENT 自动增长...
mysql> create table biao ( //创建一个表叫‘biao’ -> id int(4) not null primary key auto_increment, //第一个为id,类型为int,长度为4,不为空,定义其为主键,设置为自动增长 -> name varchar(10) not null, //第二个为name,类型为varchar,长度为10,不为空 -> address varchar(50) default '...
CREATETABLE`x` ( `id`int(11)NOTNULLAUTO_INCREMENT,PRIMARYKEY(`id`) ) ENGINE=InnoDB AUTO_INCREMENT=4DEFAULTCHARSET=utf8Tablerecordonmasterandslave: M:select*fromx;+---+|id|+---+|1||2||3|+---+3rowsinset(0.00sec) S:select*fromx;+---+|id|+---+|1||3|+---+2rowsinset(0.00...
) ENGINE=InnoDB AUTO_INCREMENT=2539968 DEFAULT CHARSET=utf8 共返回 1 行记录,花费 5 ms. CREATE TABLE `t1` ( `id` bigint(20) NOT NULL, xxxxxx PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 共返回 1 行记录,花费 5 ms. ...
mysql_cursor.execute("select field_name from mssql_masked_field where status='ON'") result = mysql_cursor.fetchall() black_fields = [] for ii in result: black_fields.append(ii[0]) print(f"当前的需要脱敏的列清单: {black_fields}") ...
Source and Target selection: Allows users to define specific data sources and to analyze source data in advance of the migration. Object migration: Allows users to select objects to migrate, assign a source to target mappings where needed, edit migration scripts and create the target schema. ...
(MDataRow row in dt.Rows) { for (int i = 0; i < dt.Columns.Count; i++) { #region 设置值 ms = dt.Columns[i]; if (!keepID && ms.IsAutoIncrement) { continue; } else if (dalType == DalType.MySql && row[i].IsNull) { sw.Write("\\N");//Mysql用\N表示null值。 } ...
CREATE TABLE `TEST_TB_GRADE` ( `ID` int(10) NOT NULL AUTO_INCREMENT, `USER_NAME` varchar(20) DEFAULT NULL, `COURSE` varchar(20) DEFAULT NULL, `SCORE` float DEFAULT '0', PRIMARY KEY (`ID`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8; insert into TEST_TB_GRADE(USER_NAME...
Imports all Constraints and Indexes and Auto Increment attributes. In Built Scheduler Automatically transfer data without any interaction. Bulk Loading Bulk Loading feature for Oracle, MySQL and MS SQL Server databases to load millions of rows at blazing speed. ...