要了解有關(guān)Spring JDBC框架與JdbcTemplate類的概念，讓我們寫這將實(shí)現(xiàn)所有在下面Student表的CRUD操作的簡單例子。

CREATE TABLEStudent(ID INT NOT NULL AUTO_INCREMENT,NAME VARCHAR(20)NOT NULL,AGE INT NOT NULL,PRIMARY KEY(ID));

在開始之前，讓我們使用Eclipse IDE，并按照下面的步驟來創(chuàng)建一個(gè)Spring應(yīng)用程序：

步驟

描述

1

Create a project with a name?SpringExample?and create a package?com.yiibai?under the?src?folder in the created project.

2

Add required Spring libraries using?Add External JARs?option as explained in the?Spring Hello World Example?chapter.

3

Add Spring JDBC specific latest libraries?mysql-connector-java.jar,org.springframework.jdbc.jar?and?org.springframework.transaction.jar?in the project. You can download required libraries if you do not have them already.

4

Create DAO interface?StudentDAO?and list down all the required methods. Though it is not required and you can directly write?StudentJDBCTemplate?class, but as a good practice, let's do it.

5

Create other required Java classes?Student,?StudentMapper,?StudentJDBCTemplate?andMainApp?under the?com.yiibai?package.

6

Make sure you already created?Student?table in TEST database. Also make sure your MySQL server is working fine and you have read/write access on the database using the give username and password.

7

Create Beans configuration file?Beans.xml?under the?src?folder.

8

The final step is to create the content of all the Java files and Bean Configuration file and run the application as explained below.

以下是數(shù)據(jù)訪問對(duì)象接口文件StudentDAO.java的內(nèi)容：

packagecom.yiibai;importjava.util.List;importjavax.sql.DataSource;publicinterfaceStudentDAO{/**

* This is the method to be used to initialize

* database resources ie. connection.

*/publicvoidsetDataSource(DataSourceds);/**

* This is the method to be used to create

* a record in the Student table.

*/publicvoidcreate(Stringname,Integerage);/**

* This is the method to be used to list down

* a record from the Student table corresponding

* to a passed student id.

*/publicStudentgetStudent(Integerid);/**

* This is the method to be used to list down

* all the records from the Student table.

*/publicListlistStudents();/**

* This is the method to be used to delete

* a record from the Student table corresponding

* to a passed student id.

*/publicvoiddelete(Integerid);/**

* This is the method to be used to update

* a record into the Student table.

*/publicvoidupdate(Integerid,Integerage);}

以下是Student.java文件的內(nèi)容：

packagecom.yiibai;publicclassStudent{privateIntegerage;privateStringname;privateIntegerid;publicvoidsetAge(Integerage){this.age=age;}publicIntegergetAge(){returnage;}publicvoidsetName(Stringname){this.name=name;}publicStringgetName(){returnname;}publicvoidsetId(Integerid){this.id=id;}publicIntegergetId(){returnid;}}

以下是StudentMapper.java文件的內(nèi)容：

packagecom.yiibai;importjava.sql.ResultSet;importjava.sql.SQLException;importorg.springframework.jdbc.core.RowMapper;publicclassStudentMapperimplementsRowMapper{publicStudentmapRow(ResultSetrs,introwNum)throwsSQLException{Studentstudent=newStudent();student.setId(rs.getInt("id"));student.setName(rs.getString("name"));student.setAge(rs.getInt("age"));returnstudent;}}

下面是實(shí)現(xiàn)類文件StudentJDBCTemplate.java 定義DAO接口StudentDAO：

packagecom.yiibai;importjava.util.List;importjavax.sql.DataSource;importorg.springframework.jdbc.core.JdbcTemplate;publicclassStudentJDBCTemplateimplementsStudentDAO{privateDataSourcedataSource;privateJdbcTemplatejdbcTemplateObject;publicvoidsetDataSource(DataSourcedataSource){this.dataSource=dataSource;this.jdbcTemplateObject=newJdbcTemplate(dataSource);}publicvoidcreate(Stringname,Integerage){StringSQL="insert into Student (name, age) values (?, ?)";jdbcTemplateObject.update(SQL,name,age);System.out.println("Created Record Name = "+name+" Age = "+age);return;}publicStudentgetStudent(Integerid){StringSQL="select * from Student where id = ?";Studentstudent=jdbcTemplateObject.queryForObject(SQL,newObject[]{id},newStudentMapper());returnstudent;}publicListlistStudents(){StringSQL="select * from Student";Liststudents=jdbcTemplateObject.query(SQL,newStudentMapper());returnstudents;}publicvoiddelete(Integerid){StringSQL="delete from Student where id = ?";jdbcTemplateObject.update(SQL,id);System.out.println("Deleted Record with ID = "+id);return;}publicvoidupdate(Integerid,Integerage){StringSQL="update Student set age = ? where id = ?";jdbcTemplateObject.update(SQL,age,id);System.out.println("Updated Record with ID = "+id);return;}}

以下是MainApp.java文件的內(nèi)容：

packagecom.yiibai;importjava.util.List;importorg.springframework.context.ApplicationContext;importorg.springframework.context.support.ClassPathXmlApplicationContext;importcom.yiibai.StudentJDBCTemplate;publicclassMainApp{publicstaticvoidmain(String[]args){ApplicationContextcontext=newClassPathXmlApplicationContext("Beans.xml");StudentJDBCTemplatestudentJDBCTemplate=(StudentJDBCTemplate)context.getBean("studentJDBCTemplate");System.out.println("------Records Creation--------");studentJDBCTemplate.create("Zara",11);studentJDBCTemplate.create("Nuha",2);studentJDBCTemplate.create("Ayan",15);System.out.println("------Listing Multiple Records--------");Liststudents=studentJDBCTemplate.listStudents();for(Studentrecord:students){System.out.print("ID : "+record.getId());System.out.print(", Name : "+record.getName());System.out.println(", Age : "+record.getAge());}System.out.println("----Updating Record with ID = 2 -----");studentJDBCTemplate.update(2,20);System.out.println("----Listing Record with ID = 2 -----");Studentstudent=studentJDBCTemplate.getStudent(2);System.out.print("ID : "+student.getId());System.out.print(", Name : "+student.getName());System.out.println(", Age : "+student.getAge());}}

以下是配置文件beans.xml文件：

<?xml version="1.0"encoding="UTF-8"?>

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd ">

創(chuàng)建源代碼和bean配置文件完成后，讓我們運(yùn)行應(yīng)用程序。如果一切順利，這將打印以下信息：

------Records Creation--------

Created Record Name = Zara Age = 11

Created Record Name = Nuha Age = 2

Created Record Name = Ayan Age = 15

------Listing Multiple Records--------

ID : 1, Name : Zara, Age : 11

ID : 2, Name : Nuha, Age : 2

ID : 3, Name : Ayan, Age : 15

----Updating Record with ID = 2 -----

Updated Record with ID = 2

----Listing Record with ID = 2 -----

ID : 2, Name : Nuha, Age : 20

你可以嘗試刪除操作，我在例子中沒有使用過，但現(xiàn)在你有一個(gè)工作的應(yīng)用程序基于Spring的JDBC框架，它可以擴(kuò)展到根據(jù)項(xiàng)目要求增加復(fù)雜的功能。還有其他的方法來訪問，將使用針對(duì)NamedParameterJdbcTemplate和SimpleJdbcTemplate類的數(shù)據(jù)庫，所以如果你有興趣學(xué)習(xí)這些課程，請(qǐng)參考Spring框架手冊(cè)。

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