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  • ibatis入门


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    iBatis简介:

    iBatis是apache的一个开源项目,一个O/R Mapping解决方案,iBatis最大的特点就是小巧,上手很快。如果不需要太多复杂的功能,iBatis是能够满足你的要求又足够灵活的最简单的解决方案,现在的iBatis已经改名为Mybatis了。

    官网为:http://www.mybatis.org/

    搭建iBatis开发环境:

    1、导入相关的jar包,ibatis-2.3.0.677.jar、mysql-connector-java-5.1.6-bin.jar

    2、编写配置文件:Jdbc连接的属性文件,总配置文件,关于每个实体的映射文件(Map文件)

    Demo:

    Student.java:

    package com.iflytek.entity;
    
    import java.sql.Date;
    
    /**
     * @author xudongwang 2011-12-31
     * 
     *         Email:xdwangiflytek@gmail.com
     * 
     */
    public class Student {
    	// 注意这里需要保证有一个无参构造方法,因为包括Hibernate在内的映射都是使用反射的,如果没有无参构造可能会出现问题
    	private int id;
    	private String name;
    	private Date birth;
    	private float score;
    
    	public int getId() {
    		return id;
    	}
    
    	public void setId(int id) {
    		this.id = id;
    	}
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public Date getBirth() {
    		return birth;
    	}
    
    	public void setBirth(Date birth) {
    		this.birth = birth;
    	}
    
    	public float getScore() {
    		return score;
    	}
    
    	public void setScore(float score) {
    		this.score = score;
    	}
    
    	@Override
    	public String toString() {
    		return "id=" + id + "	name=" + name + "	major=" + birth + "	score="
    				+ score + "
    ";
    	}
    
    }
    

    SqlMap.properties:

    driver=com.mysql.jdbc.Driver
    url=jdbc:mysql://localhost:3306/ibatis
    username=root
    password=123


    Student.xml:

    <?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"
       "http://ibatis.apache.org/dtd/sql-map-2.dtd">
    
    <sqlMap>
    	<!-- 通过typeAlias使得我们在下面使用Student实体类的时候不需要写包名 -->
    	<typeAlias alias="Student" type="com.iflytek.entity.Student" />
    
    	<!-- 这样以后改了sql,就不需要去改java代码了 -->
    	<!-- id表示select里的sql语句,resultClass表示返回结果的类型 -->
    	<select id="selectAllStudent" resultClass="Student">
    		select * from
    		tbl_student
    	</select>
    
    	<!-- parameterClass表示参数的内容 -->
    	<!-- #表示这是一个外部调用的需要传进的参数,可以理解为占位符 -->
    	<select id="selectStudentById" parameterClass="int" resultClass="Student">
    		select * from tbl_student where id=#id#
    	</select>
    
    	<!-- 注意这里的resultClass类型,使用Student类型取决于queryForList还是queryForObject -->
    	<select id="selectStudentByName" parameterClass="String"
    		resultClass="Student">
    		select name,birth,score from tbl_student where name like
    		'%$name$%'
    	</select>
    
    	<insert id="addStudent" parameterClass="Student">
    		insert into
    		tbl_student(name,birth,score) values
    		(#name#,#birth#,#score#);
    		<selectKey resultClass="int" keyProperty="id">
    			select @@identity as inserted
    			<!-- 这里需要说明一下不同的数据库主键的生成,对各自的数据库有不同的方式: -->
    			<!-- mysql:SELECT LAST_INSERT_ID() AS VALUE -->
    			<!-- mssql:select @@IDENTITY as value -->
    			<!-- oracle:SELECT STOCKIDSEQUENCE.NEXTVAL AS VALUE FROM DUAL -->
    			<!-- 还有一点需要注意的是不同的数据库生产商生成主键的方式不一样,有些是预先生成 (pre-generate)主键的,如Oracle和PostgreSQL。 
    				有些是事后生成(post-generate)主键的,如MySQL和SQL Server 所以如果是Oracle数据库,则需要将selectKey写在insert之前 -->
    		</selectKey>
    	</insert>
    
    	<delete id="deleteStudentById" parameterClass="int">
    		<!-- #id#里的id可以随意取,但是上面的insert则会有影响,因为上面的name会从Student里的属性里去查找 -->
    		<!-- 我们也可以这样理解,如果有#占位符,则ibatis会调用parameterClass里的属性去赋值 -->
    		delete from tbl_student where id=#id#
    	</delete>
    
    	<update id="updateStudent" parameterClass="Student">
    		update tbl_student set
    		name=#name#,birth=#birth#,score=#score# where id=#id#
    	</update>
    
    </sqlMap>


    说明:

    如果xml中没有ibatis的提示,则window--> Preference--> XML-->XML Catalog--->点击add

    选择uri URI: 请选择本地文件系统上

    iBatisDemo1/WebContent/WEB-INF/lib/sql-map-config-2.dtd文件;

    KeyType: 选择Schema Location;

    Key: 需要联网的,不建议使用;

    SqlMapConfig.xml:

    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE sqlMapConfig PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"
        "http://ibatis.apache.org/dtd/sql-map-config-2.dtd">
    
    <sqlMapConfig>
    	<!-- 引用JDBC属性的配置文件 -->
    	<properties resource="com/iflytek/entity/SqlMap.properties" />
    	<!-- 使用JDBC的事务管理 -->
    	<transactionManager type="JDBC">
    		<!-- 数据源 -->
    		<dataSource type="SIMPLE">
    			<property name="JDBC.Driver" value="${driver}" />
    			<property name="JDBC.ConnectionURL" value="${url}" />
    			<property name="JDBC.Username" value="${username}" />
    			<property name="JDBC.Password" value="${password}" />
    		</dataSource>
    	</transactionManager>
    	<!-- 这里可以写多个实体的映射文件 -->
    	<sqlMap resource="com/iflytek/entity/Student.xml" />
    </sqlMapConfig>

    StudentDao:

    package com.iflytek.dao;
    
    import java.util.List;
    
    import com.iflytek.entity.Student;
    
    /**
     * @author xudongwang 2011-12-31
     * 
     *         Email:xdwangiflytek@gmail.com
     * 
     */
    public interface StudentDao {
    
    	/**
    	 * 添加学生信息
    	 * 
    	 * @param student
    	 *            学生实体
    	 * @return 返回是否添加成功
    	 */
    	public boolean addStudent(Student student);
    
    	/**
    	 * 根据学生id删除学生信息
    	 * 
    	 * @param id
    	 *            学生id
    	 * @return 删除是否成功
    	 */
    	public boolean deleteStudentById(int id);
    
    	/**
    	 * 更新学生信息
    	 * 
    	 * @param student
    	 *            学生实体
    	 * @return 更新是否成功
    	 */
    	public boolean updateStudent(Student student);
    
    	/**
    	 * 查询全部学生信息
    	 * 
    	 * @return 返回学生列表
    	 */
    	public List<Student> selectAllStudent();
    
    	/**
    	 * 根据学生姓名模糊查询学生信息
    	 * 
    	 * @param name
    	 *            学生姓名
    	 * @return 学生信息列表
    	 */
    	public List<Student> selectStudentByName(String name);
    
    	/**
    	 * 根据学生id查询学生信息
    	 * 
    	 * @param id
    	 *            学生id
    	 * @return 学生对象
    	 */
    	public Student selectStudentById(int id);
    
    }
    

    StudentDaoImpl:

    package com.iflytek.daoimpl;
    
    import java.io.IOException;
    import java.io.Reader;
    import java.sql.SQLException;
    import java.util.List;
    
    import com.ibatis.common.resources.Resources;
    import com.ibatis.sqlmap.client.SqlMapClient;
    import com.ibatis.sqlmap.client.SqlMapClientBuilder;
    import com.iflytek.dao.StudentDao;
    import com.iflytek.entity.Student;
    
    /**
     * @author xudongwang 2011-12-31
     * 
     *         Email:xdwangiflytek@gmail.com
     * 
     */
    public class StudentDaoImpl implements StudentDao {
    
    	private static SqlMapClient sqlMapClient = null;
    
    	// 读取配置文件
    	static {
    		try {
    			Reader reader = Resources
    					.getResourceAsReader("com/iflytek/entity/SqlMapConfig.xml");
    			sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
    			reader.close();
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    	}
    
    	public boolean addStudent(Student student) {
    		Object object = null;
    		boolean flag = false;
    		try {
    			object = sqlMapClient.insert("addStudent", student);
    			System.out.println("添加学生信息的返回值:" + object);
    		} catch (SQLException e) {
    			e.printStackTrace();
    		}
    		if (object != null) {
    			flag = true;
    		}
    		return flag;
    	}
    
    	public boolean deleteStudentById(int id) {
    		boolean flag = false;
    		Object object = null;
    		try {
    			object = sqlMapClient.delete("deleteStudentById", id);
    			System.out.println("删除学生信息的返回值:" + object + ",这里返回的是影响的行数");
    		} catch (SQLException e) {
    			e.printStackTrace();
    		}
    		if (object != null) {
    			flag = true;
    
    		}
    		return flag;
    
    	}
    
    	public boolean updateStudent(Student student) {
    		boolean flag = false;
    		Object object = false;
    		try {
    			object = sqlMapClient.update("updateStudent", student);
    			System.out.println("更新学生信息的返回值:" + object + ",返回影响的行数");
    		} catch (SQLException e) {
    			e.printStackTrace();
    		}
    		if (object != null) {
    			flag = true;
    		}
    		return flag;
    	}
    
    	public List<Student> selectAllStudent() {
    		List<Student> students = null;
    		try {
    			students = sqlMapClient.queryForList("selectAllStudent");
    		} catch (SQLException e) {
    			e.printStackTrace();
    		}
    		return students;
    	}
    
    	public List<Student> selectStudentByName(String name) {
    		List<Student> students = null;
    		try {
    			students = sqlMapClient.queryForList("selectStudentByName",name);
    		} catch (SQLException e) {
    			e.printStackTrace();
    		}
    		return students;
    	}
    
    	public Student selectStudentById(int id) {
    		Student student = null;
    		try {
    			student = (Student) sqlMapClient.queryForObject(
    					"selectStudentById", id);
    		} catch (SQLException e) {
    			e.printStackTrace();
    		}
    		return student;
    	}
    }
    


    TestIbatis.java:

    package com.iflytek.test;
    
    import java.sql.Date;
    import java.util.List;
    
    import com.iflytek.daoimpl.StudentDaoImpl;
    import com.iflytek.entity.Student;
    
    /**
     * @author xudongwang 2011-12-31
     * 
     *         Email:xdwangiflytek@gmail.com
     * 
     */
    public class TestIbatis {
    
    	public static void main(String[] args) {
    		StudentDaoImpl studentDaoImpl = new StudentDaoImpl();
    
    		System.out.println("测试插入");
    		Student addStudent = new Student();
    		addStudent.setName("李四");
    		addStudent.setBirth(Date.valueOf("2011-09-02"));
    		addStudent.setScore(88);
    		System.out.println(studentDaoImpl.addStudent(addStudent));
    
    		System.out.println("测试根据id查询");
    		System.out.println(studentDaoImpl.selectStudentById(1));
    
    		System.out.println("测试模糊查询");
    		List<Student> mohuLists = studentDaoImpl.selectStudentByName("李");
    		for (Student student : mohuLists) {
    			System.out.println(student);
    		}
    
    		System.out.println("测试查询所有");
    		List<Student> students = studentDaoImpl.selectAllStudent();
    		for (Student student : students) {
    			System.out.println(student);
    		}
    
    		System.out.println("根据id删除学生信息");
    		System.out.println(studentDaoImpl.deleteStudentById(1));
    
    		System.out.println("测试更新学生信息");
    		Student updateStudent = new Student();
    		updateStudent.setId(1);
    		updateStudent.setName("李四1");
    		updateStudent.setBirth(Date.valueOf("2011-08-07"));
    		updateStudent.setScore(21);
    		System.out.println(studentDaoImpl.updateStudent(updateStudent));
    
    	}
    }
    



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  • 原文地址:https://www.cnblogs.com/huangt/p/3667176.html
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