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MyBatis知多少（22）MyBatis删除操作

發(fā)布時間：2025/3/19 编程问答 38 豆豆

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本節(jié)從表中使用MyBatis刪除記錄。

我們已經(jīng)在MySQL下有EMPLOYEE表：

1 CREATE TABLE EMPLOYEE ( 2 id INT NOT NULL auto_increment, 3 first_name VARCHAR(20) default NULL, 4 last_name VARCHAR(20) default NULL, 5 salary INT default NULL, 6 PRIMARY KEY (id) 7 );

假設(shè)這個表是有兩條記錄如下：

mysql> select * from EMPLOYEE; +----+------------+-----------+--------+ | id | first_name | last_name | salary | +----+------------+-----------+--------+ | 1 | Zara | Ali | 5000 | | 2 | Roma | Ali | 3000 | +----+------------+-----------+--------+ 2 row in set (0.00 sec)

Employee POJO 類:

要執(zhí)行刪除操作，就需要修改Employee.java文件。

1 public class Employee { 2 private int id; 3 private String first_name; 4 private String last_name; 5 private int salary; 6 7 /* Define constructors for the Employee class. */ 8 public Employee() {} 9 10 public Employee(String fname, String lname, int salary) { 11 this.first_name = fname; 12 this.last_name = lname; 13 this.salary = salary; 14 } 15 16 /* Here are the required method definitions */ 17 public int getId() { 18 return id; 19 } 20 public void setId(int id) { 21 this.id = id; 22 } 23 public String getFirstName() { 24 return first_name; 25 } 26 public void setFirstName(String fname) { 27 this.first_name = fname; 28 } 29 public String getLastName() { 30 return last_name; 31 } 32 public void setlastName(String lname) { 33 this.last_name = lname; 34 } 35 public int getSalary() { 36 return salary; 37 } 38 public void setSalary(int salary) { 39 this.salary = salary; 40 } 41 42 } /* End of Employee */

Employee.xml 文件:

要定義使用MyBatis?SQL映射語句中，我們將增加<Delete>鍵標(biāo)簽Employee.xml文件，這個標(biāo)簽定義中，我們會定義將用于在IbatisDelete.java文件執(zhí)行SQL DELETE查詢數(shù)據(jù)庫的“id”。

1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE sqlMap 3 PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" 4 "http://ibatis.apache.org/dtd/sql-map-2.dtd"> 5 6 <sqlMap namespace="Employee"> 7 <insert id="insert" parameterClass="Employee"> 8 INSERT INTO EMPLOYEE(first_name, last_name, salary) 9 values (#first_name#, #last_name#, #salary#) 10 11 <selectKey resultClass="int" keyProperty="id"> 12 select last_insert_id() as id 13 </selectKey> 14 15 </insert> 16 17 <select id="getAll" resultClass="Employee"> 18 SELECT * FROM EMPLOYEE 19 </select> 20 21 <update id="update" parameterClass="Employee"> 22 UPDATE EMPLOYEE 23 SET first_name = #first_name# 24 WHERE id = #id# 25 </update> 26 27 <delete id="delete" parameterClass="int"> 28 DELETE FROM EMPLOYEE 29 WHERE id = #id# 30 </delete> 31 32 </sqlMap>

IbatisDelete.java 文件:

文件將應(yīng)用程序級別的邏輯從Employee表中刪除記錄：

1 import com.ibatis.common.resources.Resources; 2 import com.ibatis.sqlmap.client.SqlMapClient; 3 import com.ibatis.sqlmap.client.SqlMapClientBuilder; 4 import java.io.*; 5 import java.sql.SQLException; 6 import java.util.*; 7 8 public class IbatisDelete{ 9 public static void main(String[] args) 10 throws IOException,SQLException{ 11 Reader rd = Resources.getResourceAsReader("SqlMapConfig.xml"); 12 SqlMapClient smc = SqlMapClientBuilder.buildSqlMapClient(rd); 13 14 /* This would delete one record in Employee table. */ 15 System.out.println("Going to delete record....."); 16 int id = 1; 17 18 smc.delete("Employee.delete", id ); 19 System.out.println("Record deleted Successfully "); 20 21 System.out.println("Going to read records....."); 22 List <Employee> ems = (List<Employee>) 23 smc.queryForList("Employee.getAll", null); 24 Employee em = null; 25 for (Employee e : ems) { 26 System.out.print(" " + e.getId()); 27 System.out.print(" " + e.getFirstName()); 28 System.out.print(" " + e.getLastName()); 29 System.out.print(" " + e.getSalary()); 30 em = e; 31 System.out.println(""); 32 } 33 34 System.out.println("Records Read Successfully "); 35 36 } 37 }

編譯和運行：

下面是步驟來編譯并運行上述軟件。請確保已在進(jìn)行的編譯和執(zhí)行之前，適當(dāng)?shù)卦O(shè)置PATH和CLASSPATH。

創(chuàng)建Employee.xml如上所示。
創(chuàng)建Employee.java如上圖所示，并編譯它。
創(chuàng)建IbatisDelete.java如上圖所示，并編譯它。
執(zhí)行IbatisDelete二進(jìn)制文件來運行程序。

得到以下結(jié)果，ID=1將在EMPLOYEE表中被刪除，并讀取EMPLOYEE表中的一條記錄。

Going to delete record..... Record deleted Successfully Going to read records.....2 Roma Ali 3000 Records Read Successfully

系列文章：

MyBatis知多少（1）

MyBatis知多少（2）

MyBatis知多少（3）

MyBatis知多少（4）MyBatis的優(yōu)勢

MyBatis知多少（5）業(yè)務(wù)對象模型

MyBatis知多少（6）表現(xiàn)層與業(yè)務(wù)邏輯層

MyBatis知多少（7）持久層

MyBatis知多少（8）關(guān)系型數(shù)據(jù)庫

MyBatis知多少（9）不同類型的數(shù)據(jù)庫

MyBatis知多少（10）應(yīng)用程序數(shù)據(jù)庫

MyBatis知多少（11）企業(yè)數(shù)據(jù)庫

MyBatis知多少（12）私有數(shù)據(jù)庫

MyBatis知多少（13）MyBatis如何解決數(shù)據(jù)庫的常見問題

MyBatis知多少（14）分散的數(shù)據(jù)庫系統(tǒng)

MyBatis知多少（15）數(shù)據(jù)模型

MyBatis知多少（16）MyBatis映射

MyBatis知多少（17）MyBatis和JDBC

MyBatis知多少（18）MyBatis系統(tǒng)

MyBatis知多少（19）MyBatis操作

MyBatis知多少（20）MyBatis讀取操作

MyBatis知多少（21）更新操作

轉(zhuǎn)載于:https://www.cnblogs.com/Coda/p/4687214.html

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