如何整合MyBatis

1、pom依赖

1        <dependency>
2            <groupId>org.mybatis.spring.boot</groupId>
3            <artifactId>mybatis-spring-boot-starter</artifactId>
4            <version>1.3.2</version>
5        </dependency>
6        <dependency>
7            <groupId>mysql</groupId>
8            <artifactId>mysql-connector-java</artifactId>
9            <scope>runtime</scope>
10        </dependency>
11        <!-- 分页插件 -->
12        <dependency>
13            <groupId>com.github.pagehelper</groupId>
14            <artifactId>pagehelper-spring-boot-starter</artifactId>
15            <version>1.2.5</version>
16        </dependency>
17        <!--mapper -->
18        <dependency>
19            <groupId>tk.mybatis</groupId>
20            <artifactId>mapper-spring-boot-starter</artifactId>
21            <version>1.1.3</version>
22        </dependency>
23        <!-- alibaba的druid数据库连接池 -->
24        <dependency>
25            <groupId>com.alibaba</groupId>
26            <artifactId>druid-spring-boot-starter</artifactId>
27            <version>1.1.9</version>
28        </dependency>

2、添加配置

1spring.datasource.name=mysql_test
2spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
3#druid相关配置
4spring.datasource.druid.filters=stat
5spring.datasource.druid.driver-class-name=com.mysql.jdbc.Driver
6#基本属性
7spring.datasource.druid.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=false
8spring.datasource.druid.username=root
9spring.datasource.druid.password=1234
10#配置初始化大小/最小/最大
11spring.datasource.druid.initial-size=1
12spring.datasource.druid.min-idle=1
13spring.datasource.druid.max-active=20
14#获取连接等待超时时间
15spring.datasource.druid.max-wait=60000
16#间隔多久进行一次检测，检测需要关闭的空闲连接
17spring.datasource.druid.time-between-eviction-runs-millis=60000
18#一个连接在池中最小生存的时间
19spring.datasource.druid.min-evictable-idle-time-millis=300000
20spring.datasource.druid.validation-query=SELECT 'x'
21spring.datasource.druid.test-while-idle=true
22spring.datasource.druid.test-on-borrow=false
23spring.datasource.druid.test-on-return=false
24#打开PSCache，并指定每个连接上PSCache的大小。oracle设为true，mysql设为false。分库分表较多推荐设置为false
25spring.datasource.druid.pool-prepared-statements=false
26spring.datasource.druid.max-pool-prepared-statement-per-connection-size=20
27#Mapper路径
28mybatis.mapper-locations=classpath=mapper/*.xml
29#pagehelper
30pagehelper.helperDialect=mysql
31pagehelper.reasonable=true
32pagehelper.supportMethodsArguments=true
33pagehelper.params=count=countSql

3、自动生成Mapper

添加Mybatis的自动生成插件

1            <plugin>
2                <groupId>org.mybatis.generator</groupId>
3                <artifactId>mybatis-generator-maven-plugin</artifactId>
4                <version>1.3.2</version>
5                <configuration>
6                    <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
7                    <overwrite>true</overwrite>
8                    <verbose>true</verbose>
9                </configuration>
10                <dependencies>
11                    <dependency>
12                        <groupId>mysql</groupId>
13                        <artifactId>mysql-connector-java</artifactId>
14                        <version>${mysql.version}</version>
15                    </dependency>
16                    <dependency>
17                        <groupId>tk.mybatis</groupId>
18                        <artifactId>mapper</artifactId>
19                        <version>3.4.0</version>
20                    </dependency>
21                </dependencies>
22            </plugin>

配置Mybatis的generatorConfig

1<?xml version="1.0" encoding="UTF-8"?>
2<!DOCTYPE generatorConfiguration
3        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
4        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
5<generatorConfiguration>
6    <properties resource="application.properties"/>
7    <context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">
8        <property name="beginningDelimiter" value="`"/>
9        <property name="endingDelimiter" value="`"/>
10        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">
11            <property name="mappers" value="sample.mybatis.mapper.MyMapper"/>
12        </plugin>
13        <jdbcConnection connectionURL="jdbc:mysql://localhost:3306/test?useUnicode=true"
14                        driverClass="com.mysql.jdbc.Driver"
15                        userId="root"
16                        password="1234">
17        </jdbcConnection>
18        <javaModelGenerator targetPackage="sample.mybatis.entity" targetProject="src/main/java">
19        </javaModelGenerator>
20        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"/>
21        <javaClientGenerator targetPackage="sample.mybatis.dao" targetProject="src/main/java"
22                             type="XMLMAPPER"/>
23        <table tableName="city">
24            <!--mysql 配置-->
25            <generatedKey column="id" sqlStatement="Mysql" identity="true"/>
26        </table>
27    </context>
28</generatorConfiguration>

执行插件会自动生成实体Bean，Mapper接口和对应的xml文件。

5、写个简单的Controller触发调用

1@RestController
2public class CityController {
3
4    @Autowired
5    private CityMapper cityMapper;
6
7    @GetMapping("/")
8    public List<City> index() {
9        PageHelper.startPage(0, 3);
10        List<City> cities = this.cityMapper.selectAll();
11        return cities;
12    }
13
14}

启动项目后通过PostMan访问：http://localhost:8080/

源码地址：GitHub

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