The first mybaits Program (add, delete, modify, and query)

1. First establish project import MySQL driver jar package mybatis-3.1.1.jar

2. Edit the configuration file config. properties, mybatis-config.xml, studentmapper. xml

Config. Properties

driver=com.mysql.jdbc.Driverurl=jdbc:mysql://localhost:3306/studentuser=rootpassword=123

Mybatis-config.xml (core configuration files for database connections, transaction management, etc)

<? XML version = "1.0" encoding = "UTF-8"?> <! Doctype configurationpublic "-// mybatis.org//dtd config 3.0 //" http://mybatis.org/dtd/mybatis-3-config.dtd "> <configuration> <properties resource =" com/ibatis/config. properties "> <! -- Read the property file --> </Properties> <environments default = "development"> <environment id = "development"> <transactionmanager type = "JDBC"/> <datasource type =" pooled "> <property name =" driver "value =" $ {driver} "/> <property name =" url "value =" $ {URL} "/> <property name = "username" value = "$ {user}"/> <property name = "password" value = "$ {password}"/> </datasource> </environment> </environments> <mappers> <mapper resource = "com/ibatis/studentmapper. XML "/> </mappers> </configuration>

Studentmapper. XML (ing file)

<? XML version = "1.0" encoding = "UTF-8"?> <! Doctype mapper public "-// mybatis.org//dtd mapper 3.0 //" http://mybatis.org/dtd/mybatis-3-mapper.dtd "> <mapper namespace =" com. ibatis "> <select id =" selectallstudent "resulttype =" com. ibatis. student "> select * from student <! -- Student here is the database's student table --> </SELECT> <select id = "selectonestudent" resulttype = "com. ibatis. student "parametertype =" int "> select * from student where student. id = # {ID}; </SELECT> <insert id = "addstudent" parametertype = "com. ibatis. student "usegeneratedkeys =" true "keyproperty =" ID "> insert into student (ID, name, age, mail) values (# {ID}, # {name }, # {age },# {mail}); </Insert> <Delete id = "deletestudent" parametertype = "int"> Delete from student where student. id = # {ID} </delete> <update id = "updatestudent" parametertype = "com. ibatis. student "> Update student set student. name = # {name}, student. age = # {age}, student. mail = # {mail} Where student. id =#{ ID} </update> </mapper>

Studentdaoimpl. Java

package com.Dao.Impl;import java.io.IOException;import java.io.InputStream;import java.util.List;import org.apache.ibatis.io.Resources;import org.apache.ibatis.session.SqlSession;import org.apache.ibatis.session.SqlSessionFactory;import org.apache.ibatis.session.SqlSessionFactoryBuilder;import com.Dao.*;import com.Ibatis.Student; public class StudentDaoImpl implements StudentDao { private static SqlSessionFactory ssf ;  static{  String resource ="com/Ibatis/mybatis-config.xml";  InputStream stream;try {stream = Resources.getResourceAsStream(resource); ssf= new SqlSessionFactoryBuilder().build(stream); stream.close();} catch (IOException e) {e.printStackTrace();}  } public List<Student> GetAllStduent() {List<Student> list = null;SqlSession session = null; try { session = ssf.openSession(); list= session.selectList("com.Ibatis.SelectAllStudent");} catch (Exception e) {e.printStackTrace();}finally{session.close();} return list;}public void AddStudent(Student student) { SqlSession session = null; try { session = ssf.openSession();session.insert("com.Ibatis.AddStudent",student); session.commit();} catch (Exception e) {e.printStackTrace();}finally{session.close();}}public void DeleteStudent(int id) { SqlSession session = null; try { session = ssf.openSession(); session.delete("com.Ibatis.DeleteStudent", id); session.commit();} catch (Exception e) {e.printStackTrace();}finally{session.close();}}public Student GetOneStudent(int id) { Student student = null;  SqlSession session = null; try { session = ssf.openSession(); student =session.selectOne("com.Ibatis.SelectOneStudent", id);} catch (Exception e) {e.printStackTrace();}finally{session.close();} return student;}public void UpdateStudent(Student student) {SqlSession session = null; try { session = ssf.openSession(); session.update("com.Ibatis.UpdateStudent", student); session.commit();} catch (Exception e) {e.printStackTrace();}finally{session.close();}}}

Studenttest. Java

Public static void main (string [] ARGs) {studentdao Dao = new studentdaoimpl (); system. out. println ************************ ***"); list <student> List = Dao. getallstduent (); For (student s: List) {system. out. println (S. tostring ();} system. out. println ("************* Add a new record ********************* ***"); student student1 = new student (); student1.setage (45); student1.setname ("ant"); student1.setmail ("ant@sina.com"); Dao. addstudent (student1); system. out. println ("************** query 12th records before deletion ***************"); student student3 = Dao. getonestudent (12); If (student3 = NULL) {system. out. println ("12th records deleted");} else {system. out. println (student3.tostring ();} system. out. println ("*************** Delete 12th records *****************"); dao. deletestudent (12); system. out. println ("**************** query 12th records after deletion **************"); student student2 = Dao. getonestudent (12); If (student2 = NULL) {system. out. println ("12th records deleted");} else {system. out. println (student2.tostring ();} system. out. println ("*************** obtain the record before the update ****************** **"); student student4 = Dao. getonestudent (4); system. out. println (student4.getname (); student4.setname ("My name is changed"); Dao. updatestudent (student4); system. out. println ("*************** obtain the updated record ****************** **"); student student5 = Dao. getonestudent (4); system. out. println (student5.getname ());}