1. 编程号首页

tkMapper的基本使用

编程小号 • • 未分类

tkMapper的基本使用tkMappertkMapper整合整合mybatis依赖配置类启动类扫描整合tkMapper依赖修改启动类的`@MapperScan`注解的包tkMapper使用创建数据表创建实体类创建Mapper接口测试tkMapper的常用方法增删改添加修改删除查询查询所有根据主键查询条件查询分页查询带条件分页查询基于MyBatis提供了很多第三方插件，这些插件通常可以完成数据操作方法的封装（GeneralDAO）、数据库逆向工程工作(根据数据表生成实体类、生成映射文件)tkMapper就是一个MyBatis

tkMapper

基于MyBatis提供了很多第三方插件，这些插件通常可以完成数据操作方法的封装（GeneralDAO）、数据库逆向工程工作(根据数据表生成实体类、生成映射文件)

  • tkMapper就是一个MyBatis插件，是在MyBatis的基础上提供了很多工具，让开发变得简单，提高开发效率。

  • 提供了针对单表通用的数据库操作方法

  • 逆向工程（根据数据表生成实体类、dao接口、映射文件）

tkMapper整合

整合mybatis

依赖

		<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.20</version>
        </dependency>


        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.0</version>
        </dependency>

配置类

server:
  port: 8080
  servlet:
    context-path: /

#连接数据库的信息
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/fmmall?serverTimezone=UTC&useUnicode=true&characterEncoding=UTF-8
    username: root
    password: 123456


mybatis:
  # 扫描映射文件
  mapper-locations: classpath:mapper/*.xml
  # 配置别名扫描的包
  type-aliases-package: com.blb.entity
  configuration:
    # 开启驼峰映射配置
    map-underscore-to-camel-case: true

启动类扫描

@SpringBootApplication
@MapperScan("com.blb.mapper")
public class TkmapperApplication { 
   

    public static void main(String[] args) { 
   
        SpringApplication.run(TkmapperApplication.class, args);
    }

}

整合tkMapper

依赖

<dependency>
    <groupId>tk.mybatis</groupId>
    <artifactId>mapper-spring-boot-starter</artifactId>
    <version>2.1.5</version>
</dependency>

修改启动类的@MapperScan注解的包

  • 为tk.mybatis.spring.annotation.MapperScan
package com.blb;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import tk.mybatis.spring.annotation.MapperScan;

@SpringBootApplication
@MapperScan("com.blb.mapper")
public class TkmapperApplication { 
   

    public static void main(String[] args) { 
   
        SpringApplication.run(TkmapperApplication.class, args);
    }

}

tkMapper使用

创建数据表

CREATE TABLE `users`  (
  `user_id` int(64) NOT NULL AUTO_INCREMENT COMMENT '主键id 用户id',
  `username` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '用户名 用户名',
  `password` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '密码 密码',
  `nickname` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '昵称 昵称',
  `realname` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '真实姓名 真实姓名',
  `user_img` varchar(1024) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '头像 头像',
  `user_mobile` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '手机号 手机号',
  `user_email` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '邮箱地址 邮箱地址',
  `user_sex` char(1) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '性别 M(男) or F(女)',
  `user_birth` date NULL DEFAULT NULL COMMENT '生日 生日',
  `user_regtime` datetime(0) NOT NULL COMMENT '注册时间 创建时间',
  `user_modtime` datetime(0) NOT NULL COMMENT '更新时间 更新时间',
  PRIMARY KEY (`user_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '用户 ' ROW_FORMAT = Compact;

创建实体类

@Data
@NoArgsConstructor
@AllArgsConstructor


@Table(name="users")// 表名和数据库名不一致无法映射
public class User { 
   

    private int userId;
    private String username;
    private String password;
    private String nickname;
    private String realname;
    private String userImg;
    private String userMobile;
    private String userEmail;
    private String userSex;
    private Date userBirth;
    private Date userRegtime;
    private Date userModtime;

}

创建Mapper接口

tkMapper已经完成了对单表的通用操作的封装，封装在Mapper接口和MySqlMapper接口；因此如果我们要完成对单表的操作，只需自定义Mapper接口继承Mapper接口和MySqlMapper接口

package com.blb.mapper;

import com.blb.entity.User;
import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

public interface UserMapper extends Mapper<User>, MySqlMapper<User> { 
   
}

测试

@SpringBootTest
class TkmapperApplicationTests { 
   


    @Autowired
   private UserMapper userMapper;
    @Test
    void testInsert() { 
   
        User user=new User();
        user.setUsername("aaaa");
        user.setPassword("1111");
        user.setUserImg("img/default.png");
        user.setUserRegtime(new Date());
        user.setUserModtime(new Date());
        int insert = userMapper.insert(user);
        System.out.println(insert);
    }

}

tkMapper的常用方法

package com.blb.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.Column;
import javax.persistence.Id;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Category { 
   

    @Id
    private Integer categoryId;
    private String categoryName;
    private Integer categoryLevel;
    private Integer parentId;
    private String categoryIcon;
    private String categorySlogan;
    private String categoryPic;
    private String categoryBgColor;

}


package com.blb.mapper;

import com.blb.entity.Category;
import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

public interface CategoryMapper extends Mapper<Category>, MySqlMapper<Category> { 
   
}

增删改

添加

Category category = new Category(0,"测试类别3",1,0,"03.png","xixi","aaa.jpg","black");
        //int i = categoryMapper.insert(category);
        int i = categoryMapper.insertUseGeneratedKeys(category);
        System.out.println(category.getCategoryId());
        assertEquals(1,i);

注意如果要主键回填一定要在对应的实体类的主键上添加@Id

修改

Category category = new Category(48,"测试类别4",1,0,"04.png","heihei","aaa.jpg","black");
        int i = categoryDAO.updateByPrimaryKey(category);
        // 根据自定义条件修改，Example example就是封装条件的
        // int i1 = categoryDAO.updateByExample( Example example);
        assertEquals(1,i);

删除

  int i = categoryDAO.deleteByPrimaryKey(48);
        // 根据条件删除
        //int i1 = categoryDAO.deleteByExample(Example example);
        assertEquals(1,i);

查询

查询所有

 //查询所有
        List<Category> categories = categoryDAO.selectAll();
        for (Category category: categories) { 
   
            System.out.println(category);
        }

根据主键查询

//根据主键查询
        Category category = categoryDAO.selectByPrimaryKey(47);
        System.out.println(category);

条件查询

//条件查询
        //1.创建一个Example封装 类别Category查询条件
        Example example = new Example(Category.class);
        Example.Criteria criteria = example.createCriteria();
        criteria.andEqualTo("categoryLevel",1);
        criteria.orLike("categoryName","%干%");

        List<Category> categories = categoryDAO.selectByExample(example);
        for (Category category: categories) { 
   
            System.out.println(category);
        }

分页查询

//分页查询
        int pageNum = 2;
        int pageSize = 10;
        int start = (pageNum-1)*pageSize;

        RowBounds rowBounds = new RowBounds(start,pageSize);
        List<Category> categories = categoryDAO.selectByRowBounds(new Category(), rowBounds);
        for (Category category: categories) { 
   
            System.out.println(category);
        }

        //查询总记录数
        int i = categoryDAO.selectCount(new Category());
        System.out.println(i);

带条件分页查询

//带条件分页
        //条件
        Example example = new Example(Category.class);
        Example.Criteria criteria = example.createCriteria();
        criteria.andEqualTo("categoryLevel",1);
        //分页
        int pageNum = 2;
        int pageSize = 3;
        int start = (pageNum-1)*pageSize;
        RowBounds rowBounds = new RowBounds(start,pageSize);

        List<Category> categories = categoryDAO.selectByExampleAndRowBounds(example,rowBounds);
        for (Category category: categories) { 
   
            System.out.println(category);
        }

        //查询总记录数（满足条件）
        int i = categoryDAO.selectCountByExample(example);
        System.out.println(i);

关联查询

就想原来一样在接口里写方法，写mybatis的xml即可

逆向工程

逆向工程，根据创建好的数据表，生成实体类、DAO、映射文件、

添加逆向工程依赖

<build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.7</version>

                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.20</version>
                    </dependency>
                    <dependency>
                        <groupId>tk.mybatis</groupId>
                        <artifactId>mapper</artifactId>
                        <version>4.1.5</version>
                    </dependency>
                </dependencies>
            </plugin>

            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
    <!-- 引入数据库连接配置 -->
    <!-- <properties resource="jdbc.properties"/>-->

    <context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>

        <!-- 配置 GeneralDAO -->
        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">
            <property name="mappers" value="com.blb.general.GeneralMapper"/>
        </plugin>

        <!-- 配置数据库连接 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/fmmall?serverTimezone=UTC&amp;useUnicode=true&amp;characterEncoding=UTF-8" userId="root" password="123456">
        </jdbcConnection>

        <!-- 配置实体类存放路径 -->
        <javaModelGenerator targetPackage="com.blb.entity" targetProject="src/main/java"/>

        <!-- 配置 XML 存放路径 -->
        <sqlMapGenerator targetPackage="/" targetProject="src/main/resources/mapper"/>

        <!-- 配置 DAO 存放路径 -->
        <javaClientGenerator targetPackage="com.blb.mapper" targetProject="src/main/java" type="XMLMAPPER"/>

        <!-- 配置需要指定生成的数据库和表，% 代表所有表 -->
        <table tableName="%">
            <!-- mysql 配置 -->
            <!-- <generatedKey column="id" sqlStatement="Mysql" identity="true"/>-->
        </table>
        <!-- <table tableName="tb_roles">-->
        <!-- &lt;!&ndash; mysql 配置 &ndash;&gt;-->
        <!-- <generatedKey column="roleid" sqlStatement="Mysql" identity="true"/>-->
        <!-- </table>-->
        <!-- <table tableName="tb_permissions">-->
        <!-- &lt;!&ndash; mysql 配置 &ndash;&gt;-->
        <!-- <generatedKey column="perid" sqlStatement="Mysql" identity="true"/>-->
        <!-- </table>-->
    </context>
</generatorConfiguration>

<build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.5</version>
                <configuration>
                    <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
                </configuration>

                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.20</version>
                    </dependency>
                    <dependency>
                        <groupId>tk.mybatis</groupId>
                        <artifactId>mapper</artifactId>
                        <version>3.4.4</version>
                    </dependency>
                </dependencies>
            </plugin>

            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

今天的文章tkMapper的基本使用分享到此就结束了，感谢您的阅读。

版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 举报，一经查实，本站将立刻删除。
如需转载请保留出处：https://bianchenghao.cn/5626.html

赞 (0)
编程小号编程小号
0

相关推荐

发表回复

您的电子邮箱地址不会被公开。 必填项已用*标注