org.springframework.jdbc.core.SimpleJdbcInsert
類是一個多線程,可重用的對象,為將數(shù)據(jù)插入表提供了易用的功能。它提供元數(shù)據(jù)處理以簡化構(gòu)建基本insert
語句所需的代碼。實際的插入是使用Spring的JdbcTemplate
來處理的。
使用到的 Student
表的結(jié)構(gòu)如下 -
CREATE TABLE Student(
ID INT NOT NULL AUTO_INCREMENT,
NAME VARCHAR(20) NOT NULL,
AGE INT NOT NULL,
PRIMARY KEY (ID)
);
類的聲明
以下是org.springframework.jdbc.core.SimpleJdbcInsert
接口的聲明 -
public class SimpleJdbcInsert
extends AbstractJdbcInsert
implements SimpleJdbcInsertOperations
以下示例將展示使用spring jdbc進行插入查詢。使用SimpleJdbcInsert
對象向Student
表中插入一條記錄。
語法
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);
在上代碼中,
SimpleJdbcInsert
對象用來執(zhí)行向student
表中插入記錄。NamedParameterJdbcTemplate
對象來更新數(shù)據(jù)庫中的Student
對象。要了解上述與Spring JDBC相關的概念,下面我們編寫一個使用SimpleJdbcInsert
來向表中插入一個Student
對象。打開Eclipse IDE,并按照以下步驟創(chuàng)建一個Spring應用程序,這里創(chuàng)建一個名稱為:SimpleJdbcInsert 的項目。
步驟說明
完整的項目結(jié)構(gòu)如下所示 -
以下是Maven配置文件:pom.xml的代碼內(nèi)容:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.yiibai</groupId>
<artifactId>SimpleJdbcInsert</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>SimpleJdbcInsert</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.40</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.1.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.4.RELEASE</version>
</dependency>
</dependencies>
</project>
以下是數(shù)據(jù)訪問對象接口文件:StudentDAO.java的內(nèi)容:
package com.yiibai;
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();
}
以下是文件:Student.java的代碼內(nèi)容:
package com.yiibai;
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;
}
}
以下是文件:StudentMapper.java的代碼內(nèi)容:
package com.yiibai;
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;
}
}
實現(xiàn)類StudentJDBCTemplate.java
實現(xiàn)了定義的DAO接口 - StudentDAO.java
,以下是文件:StudentJDBCTemplate.java的代碼內(nèi)容:
package com.yiibai;
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;
}
}
以下是文件:MainApp.java的代碼內(nèi)容:
package com.yiibai;
import java.util.ArrayList;
import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.yiibai.StudentJDBCTemplate;
public class MainApp {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("application-beans.xml");
StudentJDBCTemplate studentJDBCTemplate = (StudentJDBCTemplate) context.getBean("studentJDBCTemplate");
System.out.println("------Records Creation--------");
studentJDBCTemplate.create("Maxsu", 21);
studentJDBCTemplate.create("Curry", 22);
studentJDBCTemplate.create("Suzend", 23);
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());
}
}
}
以下是文件:application-beans.xml的代碼內(nèi)容:
<?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.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=true" />
<property name="username" value="root" />
<property name="password" value="123456" />
</bean>
<!-- Definition for studentJDBCTemplate bean -->
<bean id="studentJDBCTemplate" class="com.yiibai.StudentJDBCTemplate">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
注意: application-beans.xml 文件的位置是:{workspace}/fistapp/src/main/java 目錄,如果放置錯了,程序可能會因為找不到此配置文件而出錯。
完成創(chuàng)建源代碼和bean和數(shù)據(jù)庫連接信息的文件配置后,運行應用程序。這里先簡單說明一下運行的步驟,在項目名稱(SimpleJdbcInsert)上點擊右鍵,在彈出的菜單中選擇:【Run As】-> 【Maven test】
在運行測試成功后,應該會輸出類似以下內(nèi)容(含有 BUILD SUCCESS 的信息) 。
接下來,點擊類文件:MainApp.java 選擇【Run As】->【Java Application】,如果應用程序一切正常,這將打印以下結(jié)果:
------Records Creation--------
Created Record Name = Maxsu Age = 21
Created Record Name = Curry Age = 22
Created Record Name = Suzend Age = 23
------Listing Multiple Records--------
ID : 1, Name : Maxsu, Age : 21
ID : 2, Name : Curry, Age : 22
ID : 3, Name : Suzend, Age : 23