spring boot 整合mybatis

1、添加依赖

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency><groupId>com.oracle</groupId><artifactId>ojdbc6</artifactId><version>11.1.0.6.0</version>            </dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.2</version></dependency> 

2、配置数据库信息

在application.properties中添加如下代码：

spring.datasource.url=jdbc:oracle:thin:@ip:port:SERVICE_NAME
spring.datasource.username=
spring.datasource.password=
spring.datasource.driver-class-name=oracle.jdbc.OracleDriver

3、创建实体类POJO

public class DefaultUdfUser {private String id;private String password_;private String username_;public String getId() {return id;}public void setId(String id) {this.id = id;}public String getUsername_() {return username_;}public void setUsername_(String username_) {this.username_ = username_;}public String getPassword_() {return password_;}public void setPassword_(String password_) {this.password_ = password_;}}

4、在src/main/resources下建立mybatis文件夹，并在此文件夹下建立UserMapper.xml，具体代码如下：

<?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.htkeystone.dcg.mapper.UserMapper" ><resultMap id="BaseResultMap" type="com.htkeystone.dcg.entity.DefaultUdfUser" ><id column="ID" property="id" jdbcType="VARCHAR" /><result column="USERNAME_" property="username_" jdbcType="VARCHAR" /><result column="PASSWORD_" property="password_" jdbcType="VARCHAR" /></resultMap><sql id="Base_Column_List" >ID,USERNAME_,PASSWORD_</sql><select id="selectByUsername" resultMap="BaseResultMap" parameterType="java.lang.String">select<include refid="Base_Column_List" /> from UDF_USER where  USERNAME_=#{username_}</select>
</mapper>

5、写UserMapper.java接口

import org.apache.ibatis.annotations.Mapper;
import com.htkeystone.dcg.entity.DefaultUdfUser;@Mapper
public interface UserMapper {DefaultUdfUser selectByUsername(String username_);
}

 

注意要加上@Mapper注解，要不然会报错

6、在Dao层写如下代码

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.htkeystone.dcg.dao.DemoDao;
import com.htkeystone.dcg.mapper.UserMapper;@Service
public class DemoDaoImpl implements DemoDao{@Autowiredprivate UserMapper userMapper;@Overridepublic String hello() {        return userMapper.selectByUsername("000000266").getPassword_();}}

 

7、启动报错，如下图：

找不到UserMapper的id selectByUsername

原因是没有指定UserMapper.xml的路径

解决方法：在application.properties加入如下代码

mybatis.mapper-locations: classpath:mybatis/*.xml

再启动就好了