SpringBoot整合Mybatis操作数据库

一.SpringBoot整合Mybatis操作数据库：

　　第一步：添加依赖：

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>        

　　第二步：在配置文件application.properties中配置数据源信息：

#DB Configation
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/springboot?serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=root
# JPAConfiguration
spring.jpa.database=MySQL
spring.jpa.show-sql=true
spring.jpa.generate-ddl=true

　　第三步：编写实体类、mapper接口、mapeer映射文件

　　第四步：手动配置mybatis的包扫描

　　　　　　在主启动类添加@MapperScan注解，否者会报如下错误：

 错误：org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.offcn.mapper.UserMapper.getUserList

注意：Mapper.xml映射文件要放在resources目录下，或者在pom.xml配置如下代码：

　　<build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.*</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>