SpringBoot資料訪問Mybatis註解版，配置版，註解與配置一體版
阿新 • • 發佈：2018-12-08
SpringBoot資料訪問Mybatis註解版，配置版，註解與配置一體版
註解版：
1.改druid 連線池，不改可以跳過這步
新增依賴
<dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.11</version> </dependency>
修改配置檔案：
application.yaml
spring: datasource: #driver-class-name: com.mysql.jdbc.Driver driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://localhost:3306/activiti10unit?characterEncoding=utf-8&serverTimezone=GMT username: root password: root #告知springboot 使用的連結池型別是druid type: com.alibaba.druid.pool.DruidDataSource initialSize: 20 maxActive: 30 minIdle: 10 userSSL: false
寫mapper介面，加上@mapper註解
com.example.mybatis2018.mapper.UserMapper
package com.example.mybatis2018.mapper; import com.example.mybatis2018.pojo.User; import org.apache.ibatis.annotations.*; import org.springframework.stereotype.Component; /** * 使用@Mapper主鍵 來標註這是一個Mapper介面 */ @Mapper public interface UserMapper { @Select("select * from user where id = #{id}") User selectUserbyId(Long id); /** * 自增主鍵 select last_insert_id() * 非 自增主鍵 select uuid（） before：true * @param user * @return */ //自增主鍵 @SelectKey(keyProperty = "id",keyColumn = "id",statement = "select last_insert_id()" ,before=false,resultType = Long.class) @Insert("insert into user (USER_NAEM,USER_PASSWORD) values(#{USER_NAEM},#{USER_PASSWORD})") int insertUser(User user); @Delete("delete from user where id = #{id}") int deleteUserById(Long id); @Update("update user set USER_NAEM=#{USER_NAEM},USER_PASSWORD = #{USER_PASSWORD} where id = #{id}") int updateUser(User user); }
控制類訪問得到資料
package com.example.mybatis2018.controller;
import com.example.mybatis2018.mapper.UserMapper;
import com.example.mybatis2018.mapper.UserMapperPeiZhi;
import com.example.mybatis2018.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class UderController {
@Autowired
private UserMapper userMapper;
@RequestMapping("/getUser/{id}")
@ResponseBody
public User getUserById(@PathVariable("id") Long id){
User u = new User();
u.setUSER_PASSWORD(DigestUtils.md5DigestAsHex("1111".getBytes()));
User user = userMapper.selectUserbyId(id);
System.out.println(user.toString());
return user;
}
}
配置版：
需要建立 對映檔案與mybatis全域性配置檔案，並載入
配置檔案的目錄結構
SqlMapperConfig.xml 全域性配置檔案
注：裡面全部註釋不要任何內容
<?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>
<!-- 配置分頁外掛 -->
<!-- <plugins>
<plugin interceptor="com.github.pagehelper.PageHelper">
<!– 設定資料庫方言 –>
<property name="dialect" value="mysql"/>
</plugin>
</plugins>-->
<!-- 是用resource屬性載入外部配置檔案 -->
<!--<properties resource="db.properties">
<!– 如果外部配置檔案有該屬性，則內部定義屬性被外部屬性覆蓋–>
<property name="jdbc.password" value="root123"/>
</properties>-->
<!-- 配置設定 -->
<!-- <settings>
<!– 如果要使用延遲載入，就必須配置這兩個屬性 –>
<setting name="lazyLoadingEnabled" value="true"/>
<setting name="aggressiveLazyLoading" value="false"/>
<!– 開啟全域性快取 –>
<setting name="cacheEnabled" value="true"/>
</settings>-->
<!-- 類型別名 -->
<!-- 配置對映檔案中使用的類型別名 -->
<!--<typeAliases>
<!– 給型別 com.igeek.crm.pojo.User取別名user–>
<typeAlias type="com.igeek.crm.pojo.User" alias="user"/>
<!– 配置一個包，讓該包中所有的類都是用簡稱 –>
<package name="com.igeek.crm.pojo"/>
</typeAliases>-->
<!-- 和spring整合後 environments配置將廢除 -->
<!-- <environments default="development">
<environment id="development">
<!– 使用jdbc事務管理 –>
<transactionManager type="JDBC" />
<!– 資料庫連線池 –>
<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>-->
<!-- 註冊對映檔案 -->
<!-- 將對映檔案配置到mybatis的配置檔案中 -->
<!--<mappers>-->
<!--
<mapper resource="sqlmap/UserMapper.xml"/>
-->
<!--
<mapper class="com.igeek.crm.mapper.UserMapper"/>
-->
<!--<package name="com.igeek.crm.mapper"/>
</mappers>-->
</configuration>
mybatis/mapper/userMapper.xml 對映檔案
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.example.mybatis2018.mapper.UserMapperPeiZhi" >
<resultMap id="BaseResultMap" type="com.example.mybatis2018.pojo.User" >
<id column="ID" property="id" jdbcType="BIGINT" />
<result column="USER_NAEM" property="USER_NAEM" jdbcType="VARCHAR" />
<result column="USER_PASSWORD" property="USER_PASSWORD" jdbcType="VARCHAR" />
</resultMap>
<select id="selectUserbyId" resultMap="BaseResultMap" parameterType="long">
select * from user where id = #{id}
</select>
<select id="selectUserbyId3" resultMap="BaseResultMap" parameterType="long">
select * from user where id = #{id}
</select>
<insert id="insertUser" parameterType="com.example.mybatis2018.pojo.User">
<selectKey keyColumn="ID" keyProperty="id" order="AFTER" resultType="long">
SELECT last_insert_id()
</selectKey>
insert into user (USER_NAEM,USER_PASSWORD) values(#{USER_NAEM},#{USER_PASSWORD})
</insert>
</mapper>載入配置檔案：
application.yaml
spring:
datasource:
#driver-class-name: com.mysql.jdbc.Driver
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/activiti10unit?characterEncoding=utf-8&serverTimezone=GMT
username: root
password: root
#告知springboot 使用的連結池型別是druid
type: com.alibaba.druid.pool.DruidDataSource
initialSize: 20
maxActive: 30
minIdle: 10
userSSL: false
mybatis:
config-location: classpath:/mybatis/SqlMapperConfig.xml #載入mybatis全域性配置檔案
mapper-locations: classpath:/mybatis/mapper/userMapper.xml #載入配置對映檔案路徑
在啟動類中掃描mapper介面：
com.example.mybatis2018.Mybatis2018Application
提示：啟動類掃描Mapper介面與mapper介面類上的 @mapper 註解掃描，兩個掃描方式任意選一個做介面掃描就可以了
package com.example.mybatis2018;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@MapperScan("com.example.mybatis2018.mapper")
//@ImportResource(locations="classpath: interceptor.xml")//掃描攔截器xml檔案
@SpringBootApplication
public class Mybatis2018Application {
public static void main(String[] args) {
SpringApplication.run(Mybatis2018Application.class, args);
}
}
建立mapper介面：
com.example.mybatis2018.mapper.UserMapperPeiZhi
package com.example.mybatis2018.mapper;
import org.apache.ibatis.annotations.*;
import com.example.mybatis2018.pojo.User;
public interface UserMapperPeiZhi {
User selectUserbyId(Long id);
int insertUser(User user);
int deleteUserById(Long id);
int updateUser(User user);
}
控制類訪問得到資料
package com.example.mybatis2018.controller;
import com.example.mybatis2018.mapper.UserMapper;
import com.example.mybatis2018.mapper.UserMapperPeiZhi;
import com.example.mybatis2018.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class UderController {
@Autowired
private UserMapperPeiZhi userMapperPeiZhi;//配置版mapper介面
@RequestMapping("/getUser2/{id}")
@ResponseBody
public User getUserById2(@PathVariable("id") Long id){
User u = new User();
u.setUSER_PASSWORD(DigestUtils.md5DigestAsHex("1111".getBytes()));
User user = userMapperPeiZhi.selectUserbyId(id);
System.out.println(user.toString());
return user;
}
}
註解與配置一體版
就是在原有的配置版的mapper介面上加@mapper註解，後在介面方法上加註解寫SQL，
但是要注意的是，對映檔案中對應的介面方法上不允許寫註解SQL，也就是介面中的方法只能採用一種方式獲取資料，
要麼註解方式獲取要麼從對映檔案中獲取；
mapper介面
提示：啟動類掃描Mapper介面與mapper介面類上的 @mapper 註解掃描，兩個掃描方式任意選一個做介面掃描就可以了
package com.example.mybatis2018.mapper;
import org.apache.ibatis.annotations.*;
import com.example.mybatis2018.pojo.User;
/**
* 使用@Mapper主鍵 來標註這是一個Mapper介面
*/
@Mapper
public interface UserMapperPeiZhi {
@Select("select * from user where id = #{id}")
User selectUserbyId2(Long id);
User selectUserbyId(Long id);
int insertUser(User user);
int deleteUserById(Long id);
int updateUser(User user);
}控制類訪問得到資料
package com.example.mybatis2018.controller;
import com.example.mybatis2018.mapper.UserMapper;
import com.example.mybatis2018.mapper.UserMapperPeiZhi;
import com.example.mybatis2018.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class UderController {
@Autowired
private UserMapper userMapper;//註解版
@Autowired
private UserMapperPeiZhi userMapperPeiZhi;//註解與配置混合版
@RequestMapping("/getUser/{id}")
@ResponseBody
public User getUserById(@PathVariable("id") Long id){
//註解版
User user = userMapper.selectUserbyId(id);
System.out.println(user.toString());
return user;
}
@RequestMapping("/getUser2/{id}")
@ResponseBody
public User getUserById2(@PathVariable("id") Long id){
//註解與配置混合版，調配置獲取資料
User user = userMapperPeiZhi.selectUserbyId(id);
System.out.println(user.toString());
return user;
}
@RequestMapping("/getUser3/{id}")
@ResponseBody
public User getUserById3(@PathVariable("id") Long id){
//註解與配置混合版，調註解獲取資料
User user = userMapperPeiZhi.selectUserbyId2(id);
System.out.println(user.toString());
return user;
}
}
pom
<?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>com.example</groupId>
<artifactId>mybatis2018</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>mybatis2018</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.11</version>
</dependency>
<!--能夠在寫配置檔案的時候有提示-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<!--引用thymeleaf啟動器-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!--https://www.webjars.org/-->
<!-- <dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.3.1-1</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>4.1.3</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery-ui</artifactId>
<version>1.12.1</version>
</dependency>
<dependency>
<groupId>org.webjars.npm</groupId>
<artifactId>jquery-easyui</artifactId>
<version>1.5.21</version>
</dependency>-->
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
pojo:
package com.example.mybatis2018.pojo;
//@Component
//@ConfigurationProperties(prefix = "user")
public class User {
private Long id ;
private String USER_NAEM;
private String USER_PASSWORD;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getUSER_NAEM() {
return USER_NAEM;
}
public void setUSER_NAEM(String USER_NAEM) {
this.USER_NAEM = USER_NAEM;
}
public String getUSER_PASSWORD() {
return USER_PASSWORD;
}
public void setUSER_PASSWORD(String USER_PASSWORD) {
this.USER_PASSWORD = USER_PASSWORD;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", USER_NAEM='" + USER_NAEM + '\'' +
", USER_PASSWORD='" + USER_PASSWORD + '\'' +
'}';
}
}