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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 + "\tname=" + name + "\tmajor=" + birth + "\tscore=" 				+ score + "\n"; 	}  } 

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));  	} }