mybatis學習-基礎
阿新 • • 發佈：2020-11-27
1、基礎回顧
1.1、引入jar包
1 <dependency> 2 <groupId>org.mybatis</groupId> 3 <artifactId>mybatis</artifactId> 4 <version>3.2.8</version> 5 </dependency> 6 7 <dependency> 8 <groupId>mysql</groupId> 9 <artifactId>mysql-connector-java</artifactId> 10<version>5.1.32</version> 11 </dependency>
1.2、 建立資料庫表
1 CREATE TABLE PERSON( 2 id INT(11) PRIMARY KEY AUTO_INCREMENT COMMENT '人員編號', 3 `name` NVARCHAR(50) NOT NULL COMMENT '姓名', 4 sex NVARCHAR(50) NOT NULL COMMENT '性別', 5 age INT(20) NOT NULL COMMENT '年齡', 6 rank NVARCHAR(50) NOT NULL COMMENT '等級',7 department NVARCHAR(100) NOT NULL COMMENT '所在部門' 8 )COMMENT '人員資訊表'; 9 10 INSERT INTO PERSON(id,name,sex,age,rank,department) VALUES(1,'張三','',25,'1級','開發部')；
1.3、JDBC基礎程式碼回顧
1 package com.ft.dao; 2 3 4 5 import java.sql.DriverManager; 6 import java.sql.ResultSet; 7 import java.sql.SQLException;8 9 import com.mysql.jdbc.Connection; 10 import com.mysql.jdbc.PreparedStatement; 11 12 public class JDBCTest { 13 public static void main(String[] args) { 14 Connection conn = null; 15 PreparedStatement pst = null; 16 ResultSet rs = null; 17 try { 18 Class.forName("com.mysql.jdbc.Driver"); 19 String url = "jdbc:mysql://127.0.0.1:3306/ssmdemo"; 20 String user = "root"; 21 String password = "root"; 22 conn = (Connection) DriverManager.getConnection(url, user, password); 23 String sql = "select * from person"; 24 pst = (PreparedStatement) conn.prepareStatement(sql); 25 rs = pst.executeQuery(); 26 while(rs.next()) { 27 System.out.print(rs.getString("id")); 28 System.out.print(rs.getString("name")); 29 System.out.print(rs.getString("sex")); 30 System.out.print(rs.getString("age")); 31 System.out.print(rs.getString("rank")); 32 System.out.println(rs.getString("department")); 33 } 34 35 }catch (Exception e) { 36 // TODO: handle exception 37 } 38 finally { 39 if(rs != null) { 40 try { 41 rs.close(); 42 pst.close(); 43 conn.close(); 44 } catch (SQLException e) { 45 // TODO Auto-generated catch block 46 e.printStackTrace(); 47 } 48 } 49 } 50 51 } 52 53 54 }
1.4、JDBC確定分析
2、MyBatis介紹
3、MyBatis整體架構
4、MyBatis快速入門
4.1、全域性配置檔案（mybatis-config.xml）
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE configuration 3 PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 4 "http://mybatis.org/dtd/mybatis-3-config.dtd"> 5 <!-- 根標籤 --> 6 <configuration> 7 <properties> 8 <property name="driver" value="com.mysql.jdbc.Driver"/> 9 <property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis-110?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true"/> 10 <property name="username" value="root"/> 11 <property name="password" value="123456"/> 12 </properties> 13 14 <!-- 環境，可以配置多個，default：指定採用哪個環境 --> 15 <environments default="test"> 16 <!-- id：唯一標識 --> 17 <environment id="test"> 18 <!-- 事務管理器，JDBC型別的事務管理器 --> 19 <transactionManager type="JDBC" /> 20 <!-- 資料來源，池型別的資料來源 --> 21 <dataSource type="POOLED"> 22 <property name="driver" value="com.mysql.jdbc.Driver" /> 23 <property name="url" value="jdbc:mysql://127.0.0.1:3306/ssmdemo" /> 24 <property name="username" value="root" /> 25 <property name="password" value="root" /> 26 </dataSource> 27 </environment> 28 <environment id="development"> 29 <!-- 事務管理器，JDBC型別的事務管理器 --> 30 <transactionManager type="JDBC" /> 31 <!-- 資料來源，池型別的資料來源 --> 32 <dataSource type="POOLED"> 33 <property name="driver" value="${driver}" /> <!-- 配置了properties，所以可以直接引用 --> 34 <property name="url" value="${url}" /> 35 <property name="username" value="${username}" /> 36 <property name="password" value="${password}" /> 37 </dataSource> 38 </environment> 39 </environments> 40 <mappers> 41 <mapper resource="mapper/MyMapper.xml"/> 42 </mappers> 43 44 </configuration>
4.2、配置Map.xml（MyMapper.xml）
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE mapper 3 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 4 "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 5 <!-- mapper:根標籤，namespace：名稱空間，隨便寫，一般保證名稱空間唯一 --> 6 <mapper namespace="MyMapper"> 7 <!-- statement，內容：sql語句。id：唯一標識，隨便寫，在同一個名稱空間下保持唯一 8 resultType：sql語句查詢結果集的封裝型別,tb_user即為資料庫中的表 9 --> 10 <select id="selectperson" resultType="com.ft.entity.Person"> 11 select * from person where id = #{id} 12 </select> 13 </mapper>
4.3、目錄結構
4.4、javaBean類
1 package com.ft.entity; 2 3 public class Person { 4 private int id; 5 private String name; 6 private String sex; 7 private int age; 8 private String rank; 9 private String department; 10 public int getId() { 11 return id; 12 } 13 public void setId(int id) { 14 this.id = id; 15 } 16 public String getName() { 17 return name; 18 } 19 public void setName(String name) { 20 this.name = name; 21 } 22 public String getSex() { 23 return sex; 24 } 25 public void setSex(String sex) { 26 this.sex = sex; 27 } 28 public int getAge() { 29 return age; 30 } 31 public void setAge(int age) { 32 this.age = age; 33 } 34 public String getRank() { 35 return rank; 36 } 37 public void setRank(String rank) { 38 this.rank = rank; 39 } 40 public String getDepartment() { 41 return department; 42 } 43 public void setDepartment(String department) { 44 this.department = department; 45 } 46 @Override 47 public String toString() { 48 return "Person [id=" + id + ", name=" + name + ", sex=" + sex + ", age=" + age + ", rank=" + rank 49 + ", department=" + department + "]"; 50 } 51 public Person(int id, String name, String sex, int age, String rank, String department) { 52 super(); 53 this.id = id; 54 this.name = name; 55 this.sex = sex; 56 this.age = age; 57 this.rank = rank; 58 this.department = department; 59 } 60 public Person() { 61 super(); 62 } 63 64 }
4.5、測試程式碼
1 package com.ft.dao; 2 3 import java.io.IOException; 4 import java.io.InputStream; 5 6 import org.apache.ibatis.io.Resources; 7 import org.apache.ibatis.session.SqlSession; 8 import org.apache.ibatis.session.SqlSessionFactory; 9 import org.apache.ibatis.session.SqlSessionFactoryBuilder; 10 11 import com.ft.entity.Person; 12 13 public class Mybatistest { 14 public static void main(String[] args) throws IOException { 15 String resource = "mybatis-config.xml"; 16 //讀取配置檔案 17 InputStream input = Resources.getResourceAsStream(resource); 18 //構建sqlSessionFactory 19 SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(input); 20 //獲取sqlSession 21 SqlSession session = sessionFactory.openSession(); 22 try { 23 Person per = session.selectOne("MyMapper.selectperson", 1); 24 System.out.println(per); 25 } finally { 26 // TODO: handle finally clause 27 session.close(); 28 } 29 30 31 } 32 }