用idea搭建mybatis架构,简单的增删改
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Mybatis的搭建
1.持久化
持久化,就是内存数据和硬盘数据状态的转换
2.ORM思想
Object Relation Mapping 对象关系映射
3.MyBatis入门案例
1.持久化
持久化,就是内存数据和硬盘数据状态的转换
2.ORM思想
Object Relation Mapping 对象关系映射
3.MyBatis入门案例
3.1导入jar包
依赖
<!--MySQL配置-->
<dependency>
<groupId>MySQL</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.0.8</version>
</dependency>
<!--MyBatis核心jar包-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.2</version>
</dependency>
3.2书写大配置
<?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"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/y2165"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>
</configuration>
3.3实体类(实体类的列必须和数据库的列一致)
public class StudentInfo {
private Integer stuId;
private String stuName;
private Integer stuAge;
private Date stuDate;
}
<?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"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/y2165"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>
</configuration>
3.3实体类(实体类的列必须和数据库的列一致)
public class StudentInfo {
private Integer stuId;
private String stuName;
private Integer stuAge;
private Date stuDate;
}
小配置:
4.大配置(resources)<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="bdqn.dao."> <select id="select" resultType="bdqn.entity.Department"> select * from department </select> <select id="selectid" resultType="Department"> select * from department where id=#{id} </select></mapper>
<?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="cn.happy.dao.IStudentInfoDAO"> <select id="findAll" resultType="cn.happy.entity.StudentInfo"> select * from studentinfo </select></mapper>
两个注意事项: 1.你得更新POM.xml文件中build节点 <build> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> </resource> </resources> </build> 2.你得在大配置中关联小配置文件 3.5测试类
public class DepartmentTest { @Test public void show(){ //查询列表 /* try { InputStream stream=Resources.getResourceAsStream("mybatis-config.xml.tld"); SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(stream); SqlSession session=sqlSessionFactory.openSession(); List<Department> list=session.selectList("select"); for (Department item:list ) { System.out.println(item.getName()); } } catch (IOException e) { e.printStackTrace(); }*/ //根据id查部门 try { InputStream stream=Resources.getResourceAsStream("mybatis-config.xml.tld"); SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(stream); SqlSession session=sqlSessionFactory.openSession(); Department one=session.selectOne("selectid",1); System.out.println(one.getName()); } catch (IOException e) { e.printStackTrace(); } }}
结论:
1. 注意小配置的命名空间的名称
4.别名的使用(加在大配置里)
<typeAliases>
<!--<typeAlias type="cn.happy.entity.StudentInfo" alias="StudentInfo"></typeAlias>-->
<!--将该包中的简单类型 StudentInfo作为类的别名-->
<package name="cn.happy.entity"></package>
</typeAliases>
<typeAliases>
<!--<typeAlias type="cn.happy.entity.StudentInfo" alias="StudentInfo"></typeAlias>-->
<!--将该包中的简单类型 StudentInfo作为类的别名-->
<package name="cn.happy.entity"></package>
</typeAliases>
小配置<select id="select" resultType="bdqn.entity.Department">改为<select id="select" resultType="Department">
5.getMapper() 动态代理数据
class<T> 类型的类型
is = Resources.getResourceAsStream(path);
SqlSessionFactory factory=new SqlSessionFactoryBuilder().build(is);
SqlSession session=factory.openSession();
IStudentInfoDAO dao = session.getMapper(IStudentInfoDAO.class);
StudentInfo info = dao.getStudentById(3);
System.out.println(info.getStuName());
class<T> 类型的类型
is = Resources.getResourceAsStream(path);
SqlSessionFactory factory=new SqlSessionFactoryBuilder().build(is);
SqlSession session=factory.openSession();
IStudentInfoDAO dao = session.getMapper(IStudentInfoDAO.class);
StudentInfo info = dao.getStudentById(3);
System.out.println(info.getStuName());
增删该查接口:
增删在小配置里的写法:
//添加单测
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