Spring对JDBC的支持

[zhaozhao15]

Spring对JDBC的支持

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Spring中有jdbcTemplate支持，可以连接数据库。
官方文档：https://docs.spring.io/spring/docs/4.3.12.RELEASE/spring-framework-reference/htmlsingle/#jdbc-JdbcTemplate
src中需要一个属性配置文件jdbc.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db_spring
jdbc.username=root
jdbc.password=123456

配置文件中

<!--详细内容看官方文档-->
    <!--配置数据源-->
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
    
    <!--加载指定路径的property文件-->
	<context:property-placeholder location="jdbc.properties"/>
    
    <!--定义jdbcTemplate-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    	<!--注入数据源属性-->
    	<property name="dataSource" ref="dataSource"></property>
    </bean>

public class StudentDaoImpl implements StudentDao{
	private JdbcTemplate jdbcTemplate;
	
	//通过set方法把jdbcTemplate从配置文件里面注入进去
	public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
		this.jdbcTemplate = jdbcTemplate;
	}

	@Override
	public int addStudent(Student student) {
		//sql当然还是照写
		String sql="insert into t_student values(null,?,?)";
		//对象数组
		Object []params=new Object[]{student.getName(),student.getAge()};
		//调用jdbc
		return jdbcTemplate.update(sql,params);
	}

	@Override
	public int updateStudent(Student student) {
		String sql="update t_student set name=?,age=? where id=?";
		Object []params=new Object[]{student.getName(),student.getAge(),student.getId()};
		return jdbcTemplate.update(sql,params);
	}

	@Override
	public int deleteStudent(int id) {
		String sql="delete from t_student where id=?";
		Object []params=new Object[]{id};
		return jdbcTemplate.update(sql,params);
	}

	@Override
	public List<Student> findStudents() {
		String sql="select * from t_student";
		final List<Student> studentList=new ArrayList<Student>();
		jdbcTemplate.query(sql, new RowCallbackHandler(){

			@Override
			public void processRow(ResultSet rs) throws SQLException {
				Student student=new Student();
				student.setId(rs.getInt("id"));
				student.setName(rs.getString("name"));
				student.setAge(rs.getInt("age"));
				studentList.add(student);
			}
			
		});
		return studentList;
	}

}