代码的github地址:https://github.com/FandyWw/spring-boot-06-data-mybatis
启动器的选择。
看pom文件:
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>
使用mybatis:数据源使用druid。
新建数据库。
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.sql.DataSource;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
@Configuration
public class DruidConfig {
@ConfigurationProperties(prefix = "spring.datasource")
@Bean
public DataSource druid(){
return new DruidDataSource();
}
//配置Druid的监控
//1、配置一个管理后台的Servlet
@Bean
public ServletRegistrationBean statViewServlet(){
ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
Map<String,String> initParams = new HashMap<>();
initParams.put("loginUsername","admin");
initParams.put("loginPassword","123456");
initParams.put("allow","");//默认就是允许所有访问
initParams.put("deny","192.168.15.21");
bean.setInitParameters(initParams);
return bean;
}
//2、配置一个web监控的filter
@Bean
public FilterRegistrationBean webStatFilter(){
FilterRegistrationBean bean = new FilterRegistrationBean();
bean.setFilter(new WebStatFilter());
Map<String,String> initParams = new HashMap<>();
initParams.put("exclusions","*.js,*.css,/druid/*");
bean.setInitParameters(initParams);
bean.setUrlPatterns(Arrays.asList("/*"));
return bean;
}
}
配置启动建表:
spring:
datasource:
# 数据源基本配置
username: root
password: 123456
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://192.168.244.130:3306/mybatis
type: com.alibaba.druid.pool.DruidDataSource
# 数据源其他配置
initialSize: 5
minIdle: 5
maxActive: 20
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
# 配置监控统计拦截的filters,去掉后监控界面sql无法统计,'wall'用于防火墙
filters: stat,wall,log4j
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
#mybatis:
# # 指定全局配置文件位置
# config-location: classpath:mybatis/mybatis-config.xml
# # 指定sql映射文件位置
# mapper-locations: classpath:mybatis/mapper/*.xml
schema:
- classpath:sql/department.sql
- classpath:sql/employee.sql
表:
接下来配置bean:
package com.atguigu.springboot.bean;
public class Employee {
private Integer id;
private String lastName;
private Integer gender;
private String email;
private Integer dId;
public void setId(Integer id) {
this.id = id;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public void setGender(Integer gender) {
this.gender = gender;
}
public void setEmail(String email) {
this.email = email;
}
public void setdId(Integer dId) {
this.dId = dId;
}
public Integer getId() {
return id;
}
public String getLastName() {
return lastName;
}
public Integer getGender() {
return gender;
}
public String getEmail() {
return email;
}
public Integer getdId() {
return dId;
}
}
package com.atguigu.springboot.bean;
public class Department {
private Integer id;
private String departmentName;
public void setId(Integer id) {
this.id = id;
}
public void setDepartmentName(String departmentName) {
this.departmentName = departmentName;
}
public Integer getId() {
return id;
}
public String getDepartmentName() {
return departmentName;
}
}
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mybatis注解版的使用:
package com.atguigu.springboot.mapper;
import com.atguigu.springboot.bean.Department;
import org.apache.ibatis.annotations.*;
//指定这是一个操作数据库的mapper
//@Mapper
public interface DepartmentMapper {
@Select("select * from department where id=#{id}")
public Department getDeptById(Integer id);
@Delete("delete from department where id=#{id}")
public int deleteDeptById(Integer id);
@Options(useGeneratedKeys = true,keyProperty = "id")
@Insert("insert into department(department_name) values(#{departmentName})")
public int insertDept(Department department);
@Update("update department set department_name=#{departmentName} where id=#{id}")
public int updateDept(Department department);
}
代码结构目录:
Controller:
package com.atguigu.springboot.controller;
import com.atguigu.springboot.bean.Department;
import com.atguigu.springboot.bean.Employee;
import com.atguigu.springboot.mapper.DepartmentMapper;
import com.atguigu.springboot.mapper.EmployeeMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class DeptController {
@Autowired
DepartmentMapper departmentMapper;
@Autowired
EmployeeMapper employeeMapper;
@GetMapping("/dept/{id}")
public Department getDepartment(@PathVariable("id") Integer id){
return departmentMapper.getDeptById(id);
}
@GetMapping("/dept")
public Department insertDept(Department department){
departmentMapper.insertDept(department);
return department;
}
@GetMapping("/emp/{id}")
public Employee getEmp(@PathVariable("id") Integer id){
return employeeMapper.getEmpById(id);
}
}
进行插入:http://localhost:8080/dept?departmentName=AAA
原理:
插入时候返回自增id:
自增---id主键的值(id设计Department的id)。
表里面是department _name但是实体类是departmrntName这样要设置。
要设置,原理:
@Bean
@ConditionalOnMissingBean
public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {
SqlSessionFactoryBean factory = new SqlSessionFactoryBean();
factory.setDataSource(dataSource);
factory.setVfs(SpringBootVFS.class);
if (StringUtils.hasText(this.properties.getConfigLocation())) {
factory.setConfigLocation(this.resourceLoader.getResource(this.properties.getConfigLocation()));
}
Configuration configuration = this.properties.getConfiguration();
if (configuration == null && !StringUtils.hasText(this.properties.getConfigLocation())) {
configuration = new Configuration();
}
if (configuration != null && !CollectionUtils.isEmpty(this.configurationCustomizers)) {
for (ConfigurationCustomizer customizer : this.configurationCustomizers) {
customizer.customize(configuration);
}
}
factory.setConfiguration(configuration);
if (this.properties.getConfigurationProperties() != null) {
factory.setConfigurationProperties(this.properties.getConfigurationProperties());
}
if (!ObjectUtils.isEmpty(this.interceptors)) {
factory.setPlugins(this.interceptors);
}
if (this.databaseIdProvider != null) {
factory.setDatabaseIdProvider(this.databaseIdProvider);
}
if (StringUtils.hasLength(this.properties.getTypeAliasesPackage())) {
factory.setTypeAliasesPackage(this.properties.getTypeAliasesPackage());
}
if (StringUtils.hasLength(this.properties.getTypeHandlersPackage())) {
factory.setTypeHandlersPackage(this.properties.getTypeHandlersPackage());
}
if (!ObjectUtils.isEmpty(this.properties.resolveMapperLocations())) {
factory.setMapperLocations(this.properties.resolveMapperLocations());
}
return factory.getObject();
}
注意这里面呢的定制器具customizer:
自己定义定制器:
package com.atguigu.springboot.config;
import org.apache.ibatis.session.Configuration;
import org.mybatis.spring.boot.autoconfigure.ConfigurationCustomizer;
import org.springframework.context.annotation.Bean;
@org.springframework.context.annotation.Configuration
public class MyBatisConfig {
@Bean
public ConfigurationCustomizer configurationCustomizer(){
return new ConfigurationCustomizer(){
@Override
public void customize(Configuration configuration) {
configuration.setMapUnderscoreToCamelCase(true);
}
};
}
}
自定义之前:
自定义之后:
在Mapper特别多的情况下可知,可以删掉每个Mapper的注解,在启动类里面添加:
package com.atguigu.springboot;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@MapperScan(value = "com.atguigu.springboot.mapper")
@SpringBootApplication
public class SpringBoot06DataMybatisApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBoot06DataMybatisApplication.class, args);
}
}
使用mapperScanner批量扫描所有的Mapper
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配置文件的用法:
package com.atguigu.springboot.mapper;
import com.atguigu.springboot.bean.Employee;
//@Mapper或者@MapperScan将接口扫描装配到容器中
public interface EmployeeMapper {
public Employee getEmpById(Integer id);
public void insertEmp(Employee employee);
}
现在不用注解的方式,写一个mysql的映射文件进行映射进去。
注意sql的映射文件怎么写,参照mybatis的官方文档:
百度github,搜索mybatis
找到全局配置文件。
<?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.atguigu.springboot.mapper.EmployeeMapper">
<!-- public Employee getEmpById(Integer id);
public void insertEmp(Employee employee);-->
<select id="getEmpById" resultType="com.atguigu.springboot.bean.Employee">
SELECT * FROM employee WHERE id=#{id}
</select>
<insert id="insertEmp">
INSERT INTO employee(lastName,email,gender,d_id) VALUES (#{lastName},#{email},#{gender},#{dId})
</insert>
</mapper>
写接口的全类名:
<mapper namespace="com.atguigu.springboot.mapper.EmployeeMapper">
<select id="getEmpById" resultType="com.atguigu.springboot.bean.Employee">
SELECT * FROM employee WHERE id=#{id}
</select>
设置驼峰命名法。
id就是方法名。
<?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>
<settings>
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
</configuration>
spring:
datasource:
# 数据源基本配置
username: root
password: 123456
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://192.168.244.130:3306/mybatis
type: com.alibaba.druid.pool.DruidDataSource
# 数据源其他配置
initialSize: 5
minIdle: 5
maxActive: 20
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
# 配置监控统计拦截的filters,去掉后监控界面sql无法统计,'wall'用于防火墙
filters: stat,wall,log4j
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
mybatis:
# 指定全局配置文件位置
config-location: classpath:mybatis/mybatis-config.xml
# 指定sql映射文件位置
mapper-locations: classpath:mybatis/mapper/*.xml
# schema:
# - classpath:sql/department.sql
# - classpath:sql/employee.sql
设置全局配置文件。
mybatis:
# 指定全局配置文件位置
config-location: classpath:mybatis/mybatis-config.xml
# 指定sql映射文件位置
mapper-locations: classpath:mybatis/mapper/*.xml
写controller
@GetMapping("/emp/{id}")
public Employee getEmp(@PathVariable("id") Integer id){
return employeeMapper.getEmpById(id);
}