Java之MyBatisIDEA版（一篇文章精通系列）增删改查注解开发 - 所有知识点（大全）
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Java之MyBatis【IDEA版】（一篇文章精通系列）增删改查【注解开发】 - 所有知识点（大全）
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一、MyBatis的常用注解
这几年来注解开发越来越流行，Mybatis也可以使用注解开发方式，
这样我们就可以减少编写Mapper映射文件了。
我们先围绕一些基本的CRUD来学习，再学习复杂映射多表操作。
@Insert：实现新增
@Update：实现更新
@Delete：实现删除
@Select：实现查询
@Result：实现结果集封装
@Results：可以与@Result 一起使用，封装多个结果集
@One：实现一对一结果集封装
@Many：实现一对多结果集封装
1、工程搭建
（1）创建数据
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for `order`
-- ----------------------------
DROP TABLE IF EXISTS `order`;
CREATE TABLE `order` (
`id` int(11) NOT NULL,
`ordertime` bigint(60) NOT NULL,
`total` double(60,0) NOT NULL,
`uid` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of order
-- ----------------------------
INSERT INTO `order` VALUES ('1', '1631783536660', '1', '1');
INSERT INTO `order` VALUES ('2', '1631783536660', '2', '1');
INSERT INTO `order` VALUES ('3', '1631783536660', '1', '2');
-- ----------------------------
-- Table structure for `role`
-- ----------------------------
DROP TABLE IF EXISTS `role`;
CREATE TABLE `role` (
`id` int(50) NOT NULL AUTO_INCREMENT,
`roleName` varchar(50) NOT NULL,
`roleDesc` varchar(50) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of role
-- ----------------------------
INSERT INTO `role` VALUES ('1', '老师', '教学');
INSERT INTO `role` VALUES ('2', '学生', '上学');
INSERT INTO `role` VALUES ('3', '班主任', '管理班级事务');
-- ----------------------------
-- Table structure for `user`
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(50) NOT NULL,
`password` varchar(50) NOT NULL,
`birthday` bigint(20) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'ssss', '123', '1631947408458');
INSERT INTO `user` VALUES ('2', 'eeee', 'sasass', '1631783536660');
INSERT INTO `user` VALUES ('3', '3sasas', 'rerere', '1631783536660');
INSERT INTO `user` VALUES ('4', 'gffdfdf', 'ddwdwd', '1631783536660');
INSERT INTO `user` VALUES ('5', 'sasasa', 'sasa', '1631783536660');
INSERT INTO `user` VALUES ('6', 'ceshi', 'abc', '1631783536660');
INSERT INTO `user` VALUES ('7', '测试数据', '123', '1631945928626');
-- ----------------------------
-- Table structure for `user_role`
-- ----------------------------
DROP TABLE IF EXISTS `user_role`;
CREATE TABLE `user_role` (
`id` int(11) NOT NULL,
`user_id` int(11) NOT NULL,
`role_id` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of user_role
-- ----------------------------
INSERT INTO `user_role` VALUES ('1', '1', '1');
INSERT INTO `user_role` VALUES ('2', '1', '2');
INSERT INTO `user_role` VALUES ('3', '2', '2');
INSERT INTO `user_role` VALUES ('4', '3', '3');
（2）创建Maven工程
（3）引入依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.itbluebox</groupId>
<artifactId>mybatis</artifactId>
<version>1.0.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.32</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
</dependencies>
</project>
（4）创建相关配置文件
- jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test2
jdbc.username=root
jdbc.password=root
- log4j.properties
### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.err
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=c:/mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
### set log levels - for more verbose logging change 'info' to 'debug' ###
log4j.rootLogger=debug, stdout
- sqlMapConfig.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--通过properties标签加载外部properties文件-->
<properties resource="jdbc.properties"></properties>
<!--自定义别名-->
<typeAliases>
<typeAlias type="cn.itbluebox.domain.User" alias="user"></typeAlias>
</typeAliases>
<!--数据源环境-->
<environments default="developement">
<environment id="developement">
<transactionManager type="JDBC"></transactionManager>
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</dataSource>
</environment>
</environments>
<!--加载映射关系-->
<mappers>
<!--指定接口所在的包-->
<package name="cn.itbluebox.mapper"></package>
</mappers>
</configuration>
（5）创建包结构
（6）创建实体类
- Order
package cn.itbluebox.domain;
import java.util.Date;
public class Order {
private int id;
private Date ordertime;
private double total;
public Order() {
}
public Order(int id, Date ordertime, double total) {
this.id = id;
this.ordertime = ordertime;
this.total = total;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public Date getOrdertime() {
return ordertime;
}
public void setOrdertime(Date ordertime) {
this.ordertime = ordertime;
}
public double getTotal() {
return total;
}
public void setTotal(double total) {
this.total = total;
}
@Override
public String toString() {
return "Order{" +
"id=" + id +
", ordertime=" + ordertime +
", total=" + total +
'}';
}
}
- Role
package cn.itbluebox.domain;
public class Role {
private int id;
private String roleName;
private String roleDesc;
public Role() {
}
public Role(int id, String roleName, String roleDesc) {
this.id = id;
this.roleName = roleName;
this.roleDesc = roleDesc;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getRoleName() {
return roleName;
}
public void setRoleName(String roleName) {
this.roleName = roleName;
}
public String getRoleDesc() {
return roleDesc;
}
public void setRoleDesc(String roleDesc) {
this.roleDesc = roleDesc;
}
@Override
public String toString() {
return "Role{" +
"id=" + id +
", roleName='" + roleName + '\\'' +
", roleDesc='" + roleDesc + '\\'' +
'}';
}
}
- User
package cn.itbluebox.domain;
import java.util.Date;
import java.util.以上是关于Java之MyBatisIDEA版（一篇文章精通系列）增删改查注解开发 - 所有知识点（大全）的主要内容，如果未能解决你的问题，请参考以下文章
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