iBatis简单入门教程
iBatis?簡介:
iBatis?是apache?的一個開源項(xiàng)目,一個O/R Mapping?解決方案,iBatis?最大的特點(diǎn)就是小巧,上手很快。如果不需要太多復(fù)雜的功能,iBatis?是能夠滿足你的要求又足夠靈活的最簡單的解決方案,現(xiàn)在的iBatis?已經(jīng)改名為Mybatis?了。
官網(wǎng)為:http://www.mybatis.org/
搭建iBatis?開發(fā)環(huán)境:
1?、導(dǎo)入相關(guān)的jar?包,ibatis-2.3.0.677.jar?、mysql-connector-java-5.1.6-bin.jar
2?、編寫配置文件:
Jdbc?連接的屬性文件
總配置文件,?SqlMapConfig.xml
關(guān)于每個實(shí)體的映射文件(Map?文件)
Demo?:
1 package com.iflytek.entity; 2 import java.sql.Date; 3 /** 4 * @author xudongwang 2011-12-31 5 * 6 * Email:xdwangiflytek@gmail.com 7 * 8 */ 9 public class Student { 10 // 注意這里需要保證有一個無參構(gòu)造方法,因?yàn)榘℉ibernate在內(nèi)的映射都是使用反射的,如果沒有無參構(gòu)造可能會出現(xiàn)問題 11 private int id; 12 private String name; 13 private Date birth; 14 private float score; 15 public int getId() { 16 return id; 17 } 18 public void setId(int id) { 19 this.id = id; 20 } 21 public String getName() { 22 return name; 23 } 24 public void setName(String name) { 25 this.name = name; 26 } 27 public Date getBirth() { 28 return birth; 29 } 30 public void setBirth(Date birth) { 31 this.birth = birth; 32 } 33 public float getScore() { 34 return score; 35 } 36 public void setScore(float score) { 37 this.score = score; 38 } 39 @Override 40 public String toString() { 41 return "id=" + id + "\tname=" + name + "\tmajor=" + birth + "\tscore=" 42 + score + "\n"; 43 } 44 }SqlMap.properties?:
1 driver=com.mysql.jdbc.Driver 2 url=jdbc:mysql://localhost:3306/ibatis 3 username=root 4 password=123 1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" 3 "http://ibatis.apache.org/dtd/sql-map-2.dtd"> 4 <sqlMap> 5 <!-- 通過typeAlias使得我們在下面使用Student實(shí)體類的時候不需要寫包名 --> 6 <typeAlias alias="Student" type="com.iflytek.entity.Student" /> 7 <!-- 這樣以后改了sql,就不需要去改java代碼了 --> 8 <!-- id表示select里的sql語句,resultClass表示返回結(jié)果的類型 --> 9 <select id="selectAllStudent" resultClass="Student"> 10 select * from 11 tbl_student 12 </select> 13 <!-- parameterClass表示參數(shù)的內(nèi)容 --> 14 <!-- #表示這是一個外部調(diào)用的需要傳進(jìn)的參數(shù),可以理解為占位符 --> 15 <select id="selectStudentById" parameterClass="int" resultClass="Student"> 16 select * from tbl_student where id=#id# 17 </select> 18 <!-- 注意這里的resultClass類型,使用Student類型取決于queryForList還是queryForObject --> 19 <select id="selectStudentByName" parameterClass="String" 20 resultClass="Student"> 21 select name,birth,score from tbl_student where name like 22 '%$name$%' 23 </select> 24 <insert id="addStudent" parameterClass="Student"> 25 insert into 26 tbl_student(name,birth,score) values 27 (#name#,#birth#,#score#); 28 <selectKey resultClass="int" keyProperty="id"> 29 select @@identity as inserted 30 <!-- 這里需要說明一下不同的數(shù)據(jù)庫主鍵的生成,對各自的數(shù)據(jù)庫有不同的方式: --> 31 <!-- mysql:SELECT LAST_INSERT_ID() AS VALUE --> 32 <!-- mssql:select @@IDENTITY as value --> 33 <!-- oracle:SELECT STOCKIDSEQUENCE.NEXTVAL AS VALUE FROM DUAL --> 34 <!-- 還有一點(diǎn)需要注意的是不同的數(shù)據(jù)庫生產(chǎn)商生成主鍵的方式不一樣,有些是預(yù)先生成 (pre-generate)主鍵的,如Oracle和PostgreSQL。 35 有些是事后生成(post-generate)主鍵的,如MySQL和SQL Server 所以如果是Oracle數(shù)據(jù)庫,則需要將selectKey寫在insert之前 --> 36 </selectKey> 37 </insert> 38 <delete id="deleteStudentById" parameterClass="int"> 39 <!-- #id#里的id可以隨意取,但是上面的insert則會有影響,因?yàn)樯厦娴膎ame會從Student里的屬性里去查找 --> 40 <!-- 我們也可以這樣理解,如果有#占位符,則ibatis會調(diào)用parameterClass里的屬性去賦值 --> 41 delete from tbl_student where id=#id# 42 </delete> 43 <update id="updateStudent" parameterClass="Student"> 44 update tbl_student set 45 name=#name#,birth=#birth#,score=#score# where id=#id# 46 </update> 47 </sqlMap>說明:
如果xml?中沒有ibatis?的提示,則window --> Preference--> XML-->XML Catalog--->?點(diǎn)擊add
選擇uri?URI:?請選擇本地文件系統(tǒng)上
iBatisDemo1/WebContent/WEB-INF/lib/sql-map-config-2.dtd?文件;
Key Type:?選擇Schema Location;
Key:?需要聯(lián)網(wǎng)的,不建議使用;
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE sqlMapConfig PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN" 3 "http://ibatis.apache.org/dtd/sql-map-config-2.dtd"> 4 <sqlMapConfig> 5 <!-- 引用JDBC屬性的配置文件 --> 6 <properties resource="com/iflytek/entity/SqlMap.properties" /> 7 <!-- 使用JDBC的事務(wù)管理 --> 8 <transactionManager type="JDBC"> 9 <!-- 數(shù)據(jù)源 --> 10 <dataSource type="SIMPLE"> 11 <property name="JDBC.Driver" value="${driver}" /> 12 <property name="JDBC.ConnectionURL" value="${url}" /> 13 <property name="JDBC.Username" value="${username}" /> 14 <property name="JDBC.Password" value="${password}" /> 15 </dataSource> 16 </transactionManager> 17 <!-- 這里可以寫多個實(shí)體的映射文件 --> 18 <sqlMap resource="com/iflytek/entity/Student.xml" /> 19 </sqlMapConfig> 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 { /** * 添加學(xué)生信息 * * @param student * 學(xué)生實(shí)體 * @return 返回是否添加成功 */ public boolean addStudent(Student student); /** * 根據(jù)學(xué)生id刪除學(xué)生信息 * * @param id * 學(xué)生id * @return 刪除是否成功 */ public boolean deleteStudentById(int id); /** * 更新學(xué)生信息 * * @param student * 學(xué)生實(shí)體 * @return 更新是否成功 */ public boolean updateStudent(Student student); /** * 查詢?nèi)繉W(xué)生信息 * * @return 返回學(xué)生列表 */ public List<Student> selectAllStudent(); /** * 根據(jù)學(xué)生姓名模糊查詢學(xué)生信息 * * @param name * 學(xué)生姓名 * @return 學(xué)生信息列表 */ public List<Student> selectStudentByName(String name); /** * 根據(jù)學(xué)生id查詢學(xué)生信息 * * @param id * 學(xué)生id * @return 學(xué)生對象 */ public Student selectStudentById(int id); } 1 package com.iflytek.daoimpl; 2 import java.io.IOException; 3 import java.io.Reader; 4 import java.sql.SQLException; 5 import java.util.List; 6 import com.ibatis.common.resources.Resources; 7 import com.ibatis.sqlmap.client.SqlMapClient; 8 import com.ibatis.sqlmap.client.SqlMapClientBuilder; 9 import com.iflytek.dao.StudentDao; 10 import com.iflytek.entity.Student; 11 /** 12 * @author xudongwang 2011-12-31 13 * 14 * Email:xdwangiflytek@gmail.com 15 * 16 */ 17 public class StudentDaoImpl implements StudentDao { 18 private static SqlMapClient sqlMapClient = null; 19 // 讀取配置文件 20 static { 21 try { 22 Reader reader = Resources 23 .getResourceAsReader("com/iflytek/entity/SqlMapConfig.xml"); 24 sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader); 25 reader.close(); 26 } catch (IOException e) { 27 e.printStackTrace(); 28 } 29 } 30 public boolean addStudent(Student student) { 31 Object object = null; 32 boolean flag = false; 33 try { 34 object = sqlMapClient.insert("addStudent", student); 35 System.out.println("添加學(xué)生信息的返回值:" + object); 36 } catch (SQLException e) { 37 e.printStackTrace(); 38 } 39 if (object != null) { 40 flag = true; 41 } 42 return flag; 43 } 44 public boolean deleteStudentById(int id) { 45 boolean flag = false; 46 Object object = null; 47 try { 48 object = sqlMapClient.delete("deleteStudentById", id); 49 System.out.println("刪除學(xué)生信息的返回值:" + object + ",這里返回的是影響的行數(shù)"); 50 } catch (SQLException e) { 51 e.printStackTrace(); 52 } 53 if (object != null) { 54 flag = true; 55 } 56 return flag; 57 } 58 public boolean updateStudent(Student student) { 59 boolean flag = false; 60 Object object = false; 61 try { 62 object = sqlMapClient.update("updateStudent", student); 63 System.out.println("更新學(xué)生信息的返回值:" + object + ",返回影響的行數(shù)"); 64 } catch (SQLException e) { 65 e.printStackTrace(); 66 } 67 if (object != null) { 68 flag = true; 69 } 70 return flag; 71 } 72 public List<Student> selectAllStudent() { 73 List<Student> students = null; 74 try { 75 students = sqlMapClient.queryForList("selectAllStudent"); 76 } catch (SQLException e) { 77 e.printStackTrace(); 78 } 79 return students; 80 } 81 public List<Student> selectStudentByName(String name) { 82 List<Student> students = null; 83 try { 84 students = sqlMapClient.queryForList("selectStudentByName",name); 85 } catch (SQLException e) { 86 e.printStackTrace(); 87 } 88 return students; 89 } 90 public Student selectStudentById(int id) { 91 Student student = null; 92 try { 93 student = (Student) sqlMapClient.queryForObject( 94 "selectStudentById", id); 95 } catch (SQLException e) { 96 e.printStackTrace(); 97 } 98 return student; 99 } 100 } 1 package com.iflytek.test; 2 import java.sql.Date; 3 import java.util.List; 4 import com.iflytek.daoimpl.StudentDaoImpl; 5 import com.iflytek.entity.Student; 6 /** 7 * @author xudongwang 2011-12-31 8 * 9 * Email:xdwangiflytek@gmail.com 10 * 11 */ 12 public class TestIbatis { 13 public static void main(String[] args) { 14 StudentDaoImpl studentDaoImpl = new StudentDaoImpl(); 15 System.out.println("測試插入"); 16 Student addStudent = new Student(); 17 addStudent.setName("李四"); 18 addStudent.setBirth(Date.valueOf("2011-09-02")); 19 addStudent.setScore(88); 20 System.out.println(studentDaoImpl.addStudent(addStudent)); 21 System.out.println("測試根據(jù)id查詢"); 22 System.out.println(studentDaoImpl.selectStudentById(1)); 23 System.out.println("測試模糊查詢"); 24 List<Student> mohuLists = studentDaoImpl.selectStudentByName("李"); 25 for (Student student : mohuLists) { 26 System.out.println(student); 27 } 28 System.out.println("測試查詢所有"); 29 List<Student> students = studentDaoImpl.selectAllStudent(); 30 for (Student student : students) { 31 System.out.println(student); 32 } 33 System.out.println("根據(jù)id刪除學(xué)生信息"); 34 System.out.println(studentDaoImpl.deleteStudentById(1)); 35 System.out.println("測試更新學(xué)生信息"); 36 Student updateStudent = new Student(); 37 updateStudent.setId(1); 38 updateStudent.setName("李四1"); 39 updateStudent.setBirth(Date.valueOf("2011-08-07")); 40 updateStudent.setScore(21); 41 System.out.println(studentDaoImpl.updateStudent(updateStudent)); 42 } 43 }?
轉(zhuǎn)載于:https://www.cnblogs.com/waitforever/p/3843906.html
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