mybatis基礎配置
阿新 • • 發佈:2018-12-10
1.MyBatis基礎配置檔案:mybatis_config.xml
<?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> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"> <property name="" value=""/> </transactionManager> <dataSource type="UNPOOLED"> <property name="driver" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/mybatis"/> <property name="username" value="root"/> <property name="password" value="root"/> </dataSource> </environment> </environments> <mappers> <mapper resource="com/learn/mybatis/role.xml"/> </mappers> </configuration>
2.對映檔案Role.xml
<?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.learn.mybatis.mapper.RoleMapper"> <select id="getRole" parameterType="long" resultType="com.learn.mybatis.model.Role"> select roleName form t_role where id=#{id} </select> </mapper>
3.定義一個呼叫介面RoleMapper.java
public interface RoleMapper{ public Role getRole(Long id); }
4.建立SqlSessionFactory:MyBatisUtil.java
public class MyBatisUtil { public static SqlSessionFactory getSqlSessionFactory() { // 通過配置檔案獲取資料庫連線資訊 Reader reader = Resources.getResourceAsReader("com/learn/mybatis/mybatis_config.xml"); // 通過配置資訊構建一個SqlSessionFactory SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); return sqlSessionFactory; } }
5.實現按id查詢姓名功能:test.java
public class test { public static void main(String[] args) { // 通過sqlSessionFactory開啟一個數據庫會話 SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory.openSession(); RoleMapper roleMapper = sqlSession.getMapper(RoleMapper.class); Role role = roleMapper.getRole(1L); System.out.println("role_name->" + role.getRoleName()); sqlSession.close(); } }
這樣便完成了mybatis一個完整流程操作。
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