Spring JDBC - SimpleJdbcInsert 类


org.springframework.jdbc.core.SimpleJdbcInsert类是一个多线程、可重用的对象,为表提供简单的插入功能它提供元数据处理来简化构建基本插入语句所需的代码。实际的插入是使用 Spring 的 JdbcTemplate 处理的

类别声明

以下是org.springframework.jdbc.core.SimpleJdbcInsert类的声明-

public class SimpleJdbcInsert
   extends AbstractJdbcInsert
      implements SimpleJdbcInsertOperations

以下示例将演示如何使用 Spring JDBC 插入查询。我们将使用 SimpleJdbcInsert 对象在 Student 表中插入一条记录。

句法

jdbcInsert = new SimpleJdbcInsert(dataSource).withTableName("Student");
Map<String,Object> parameters = new HashMap<String,Object>();

parameters.put("name", name);
parameters.put("age", age);
jdbcInsert.execute(parameters);

在哪里,

  • jdbcInsert - SimpleJdbcInsert 对象在学生表中插入记录。

  • jdbcTemplateObject - StudentJDBCTemplate 对象,用于读取数据库中的学生对象。

为了理解上述与 Spring JDBC 相关的概念,让我们编写一个插入查询的示例。为了编写我们的示例,我们需要准备一个可用的 Eclipse IDE,并使用以下步骤创建一个 Spring 应用程序。

描述
1 更新在Spring JDBC - First Application章节下创建的项目Student
2 更新 bean 配置并运行应用程序,如下所述。

以下是数据访问对象接口文件StudentDAO.java的内容。

package com.tutorialspoint;

import java.util.List;
import javax.sql.DataSource;

public interface StudentDAO {
   /** 
      * This is the method to be used to initialize
      * database resources ie. connection.
   */
   public void setDataSource(DataSource ds);
   
   /** 
      * This is the method to be used to create
      * a record in the Student table.
   */
   public void create(String name, Integer age);
   
   /** 
      * This is the method to be used to list down
      * all the records from the Student table.
   */
   public List<Student> listStudents();   
}

以下是Student.java文件的内容。

package com.tutorialspoint;

public class Student {
   private Integer age;
   private String name;
   private Integer id;

   public void setAge(Integer age) {
      this.age = age;
   }
   public Integer getAge() {
      return age;
   }
   public void setName(String name) {
      this.name = name;
   }
   public String getName() {
      return name;
   }
   public void setId(Integer id) {
      this.id = id;
   }
   public Integer getId() {
      return id;
   }
}

以下是StudentMapper.java文件的内容。

package com.tutorialspoint;

import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;

public class StudentMapper implements RowMapper<Student> {
   public Student mapRow(ResultSet rs, int rowNum) throws SQLException {
      Student student = new Student();
      student.setId(rs.getInt("id"));
      student.setName(rs.getString("name"));
      student.setAge(rs.getInt("age"));
      return student;
   }
}

下面是定义DAO接口StudentDAO的实现类文件StudentJDBCTemplate.java 。

package com.tutorialspoint;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.simple.SimpleJdbcInsert;

public class StudentJDBCTemplate implements StudentDao {
   private DataSource dataSource;
   private JdbcTemplate jdbcTemplateObject;
   SimpleJdbcInsert jdbcInsert;

   public void setDataSource(DataSource dataSource) {
      this.dataSource = dataSource;
      this.jdbcTemplateObject = new JdbcTemplate(dataSource);
      this.jdbcInsert = new SimpleJdbcInsert(dataSource).withTableName("Student");
   }
   public void create(String name, Integer age) {
      Map<String,Object> parameters = new HashMap<String,Object>();
      parameters.put("name", name);
      parameters.put("age", age);
      
      jdbcInsert.execute(parameters);
      System.out.println("Created Record Name = " + name + " Age = " + age);
      return;
   }
   public List<Student> listStudents() {
      String SQL = "select * from Student";
      List <Student> students = jdbcTemplateObject.query(SQL, new StudentMapper());
      return students;
   }
}

以下是MainApp.java文件的内容。

package com.tutorialspoint;

import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.tutorialspoint.StudentJDBCTemplate;

public class MainApp {
   public static void main(String[] args) {
      ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
      StudentJDBCTemplate studentJDBCTemplate = (StudentJDBCTemplate)context.getBean("studentJDBCTemplate");
      
      System.out.println("------Records Creation--------" );
      studentJDBCTemplate.create("Nuha", 2);

      System.out.println("------Listing Multiple Records--------" );
      List<Student> students = studentJDBCTemplate.listStudents();
      
      for (Student record : students) {
         System.out.print("ID : " + record.getId() );
         System.out.print(", Name : " + record.getName() );
         System.out.println(", Age : " + record.getAge());
      }
   }
}

以下是配置文件Beans.xml

<?xml version = "1.0" encoding = "UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" 
   xsi:schemaLocation = "http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd ">

   <!-- Initialization for data source -->
   <bean id = "dataSource" 
      class = "org.springframework.jdbc.datasource.DriverManagerDataSource">
      <property name = "driverClassName" value = "com.mysql.cj.jdbc.Driver"/>
      <property name = "url" value = "jdbc:mysql://localhost:3306/TEST"/>
      <property name = "username" value = "root"/>
      <property name = "password" value = "admin"/>
   </bean>

   <!-- Definition for studentJDBCTemplate bean -->
   <bean id = "studentJDBCTemplate" 
      class = "com.tutorialspoint.StudentJDBCTemplate">
      <property name = "dataSource" ref = "dataSource" />    
   </bean>
</beans>

创建完源文件和 bean 配置文件后,让我们运行该应用程序。如果您的应用程序一切正常,它将打印以下消息。

------Records Creation--------
Created Record Name = Nuha Age = 12
------Listing Multiple Records--------
ID : 1, Name : Zara, Age : 17
ID : 3, Name : Ayan, Age : 18
ID : 4, Name : Nuha, Age : 12