Spring 数据源配置与应用

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熔岩

2008-5-5

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Spring 数据源配置与应用

Spring对数据库操作都依赖数据源。

Spring有默认的数据源实现org.springframework.jdbc.datasource.DriverManagerDataSource，但也可以配置其他的数据源实现，比如DBCP的数据源public class BasicDataSource implements javax.sql.DataSource。

一旦获取到数据源DataSource实例，就可以通过DataSource获取到数据库连接，操作数据库。

下面是Spring数据源的一个简单配置和应用。
应用环境：MySQL5

drop table if exists user;

/*==============================================================*/
/* Table: user                                                  */
/*==============================================================*/
create table user
(
   id                   bigint AUTO_INCREMENT not null,
   name                 varchar(24),
   age                  int,
   primary key (id)
);

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

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

public interface IUserDAO {
public void insert(User user);

public User find(Integer id);
}

/**
* Created by IntelliJ IDEA. 
* User: leizhimin 
* Date: 2008-4-22 11:40:18 
* Note: 子类DAO
*/
public class UserDAO extends BaseDAO implements IUserDAO {
 public void insert(User user) {
 String name = user.getName();
 int age = user.getAge().intValue();

 Connection conn = null;
 Statement stmt = null;

 try {
 conn = getConnection();
 stmt = conn.createStatement();
 stmt.execute("INSERT INTO user (name,age) " + "VALUES('" + name + "'," + age + ")");
 } catch (SQLException e) {
 e.printStackTrace();
 }
 finally {
 if (stmt != null) {
 try {
 stmt.close();
 }
 catch (SQLException e) {
 e.printStackTrace();
 }
 }
 if (conn != null) {
 try {
 conn.close();
 }
 catch (SQLException e) {
 e.printStackTrace();
 }
 }
 }
 }

 public User find(Integer id) {
 Connection conn = null;
 Statement stmt = null;

 try {
 conn = getConnection();
 stmt = conn.createStatement();

 ResultSet result = stmt.executeQuery(
 "SELECT * FROM user WHERE id=" + id.intValue());
 if (result.next()) {
 Integer i = new Integer(result.getInt(1));
 String name = result.getString(2);
 Integer age = new Integer(result.getInt(3));

 User user = new User();
 user.setId(i);
 user.setName(name);
 user.setAge(age);

 return user;
 }
 } catch (SQLException e) {
 e.printStackTrace();
 }
 finally {
 if (stmt != null) {
 try {
 stmt.close();
 }
 catch (SQLException e) {
 e.printStackTrace();
 }
 }
 if (conn != null) {
 try {
 conn.close();
 }
 catch (SQLException e) {
 e.printStackTrace();
 }
 }
 }

 return null;
 }
}

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