org.springframework.jdbc.core.SimpleJdbcInsert 类是一个多线程,可重用的对象,为表提供了简单的插入功能.它提供元数据处理以简化构造基本插入语句所需的代码.使用Spring的JdbcTemplate处理实际插入
类声明
以下是 org.springframework.jdbc.core.SimpleJdbcInsert的声明 class :
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 Table中插入一条记录.
语法
jdbcInsert = new SimpleJdbcInsert(dataSource).withTableName("Student");Mapparameters = new HashMap ();parameters.put("name", name);parameters.put("age", age);jdbcInsert.execute(parameters);
其中,
jdbcInsert : SimpleJdbcInsert对象,用于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,让我们编写一个示例将插入一个查询.要编写我们的示例,让我们使用一个可用的Eclipse IDE并使用以下步骤创建一个Spring应用程序.
Step | 描述 |
---|---|
1 | 更新在章节下创建的项目学生Spring JDBC - First Application . |
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的内容 StudentDAO.java .
package com.it1352; 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 ListlistStudents(); }
以下是 Student.java 文件的内容.
package com.it1352; 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.it1352; import java.sql.ResultSet;import java.sql.SQLException;import org.springframework.jdbc.core.RowMapper;public class StudentMapper implements RowMapper{ 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; }}
以下是定义的DAO接口StudentDAO的实现类文件 StudentJDBCTemplate.java .
package com.it1352; 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) { Mapparameters = new HashMap (); parameters.put("name", name); parameters.put("age", age); jdbcInsert.execute(parameters); System.out.println("Created Record Name = " + name + " Age = " + age); return; } public List listStudents() { String SQL = "select * from Student"; List students = jdbcTemplateObject.query(SQL, new StudentMapper()); return students; }}
以下是 MainApp.java 文件的内容.
package com.it1352; import java.util.List;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.IT屋.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--------" ); Liststudents = 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 .
完成源和bean配置文件的创建后,让我们运行应用程序.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 : 17ID : 3, Name : Ayan, Age : 18ID : 4, Name : Nuha, Age : 12