1. 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/
2. 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, SqlMapConfig.xml
关于每个实体的映射文件(Map 文件)
3. Demo :
Student.java:
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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 :
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driver=com.mysql.jdbc.Driver url=jdbc :mysql ://localhost: 3306 /ibatis username=root password= 123 |
Student.xml :
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<?xml version= "1.0"
encoding= "UTF-8"
?> <! DOCTYPE
sqlMap PUBLIC
"-//ibatis.apache.org//DTD SQL Map 2.0//EN" <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;
Key Type: 选择Schema Location;
Key: 需要联网的,不建议使用;
SqlMapConfig.xml :
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<?xml version= "1.0"
encoding= "UTF-8" ?> <! DOCTYPE
sqlMapConfig PUBLIC
"-//ibatis.apache.org//DTD SQL Map Config 2.0//EN" <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 :
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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 :
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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)); } } |
4. iBatis 的优缺点:
转自:http://www.cnblogs.com/ycxyyzw/archive/2012/10/13/2722567.html
【转】iBatis简单入门教程,布布扣,bubuko.com
原文:http://www.cnblogs.com/sunada2005/p/3578069.html