40、JDBC相关概念介绍

时间:2023-03-09 02:32:22
40、JDBC相关概念介绍

1.1、数据库驱动

  这里的驱动的概念和平时听到的那种驱动的概念是一样的,比如平时购买的声卡,网卡直接插到计算机上面是不能用的,必须要安装相应的驱动程序之后才能够使用声卡和网卡,同样道理,我们安装好数据库之后,我们的应用程序也是不能直接使用数据库的,必须要通过相应的数据库驱动程序,通过驱动程序去和数据库打交道,如下所示:

  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" 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1.2、JDBC介绍

  SUN公司为了简化、统一对数据库的操作,定义了一套Java操作数据库的规范(接口),称之为JDBC。这套接口由数据库厂商去实现,这样,开发人员只需要学习jdbc接口,并通过jdbc加载具体的驱动,就可以操作数据库。

如下图所示:

  aaarticlea/png;base64,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*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" alt="" />

  JDBC全称为:Java Data Base Connectivity(java数据库连接),它主要由接口组成。
  组成JDBC的2个包:
   java.sql
   javax.sql
  开发JDBC应用需要以上2个包的支持外,还需要导入相应JDBC的数据库实现(即数据库驱动)。

二、编写JDBC程序

2.1、搭建实验环境

  1、在mysql中创建一个库,并创建user表和插入表的数据。

  SQL脚本如下:

40、JDBC相关概念介绍
 1 create database jdbcStudy character set utf8 collate utf8_general_ci;
2
3 use jdbcStudy;
4
5 create table users(
6 id int primary key,
7 name varchar(40),
8 password varchar(40),
9 email varchar(60),
10 birthday date
11 );
12
13 insert into users(id,name,password,email,birthday) values(1,'zhansan','123456','zs@sina.com','1980-12-04');
14 insert into users(id,name,password,email,birthday) values(2,'lisi','123456','lisi@sina.com','1981-12-04');
15 insert into users(id,name,password,email,birthday) values(3,'wangwu','123456','wangwu@sina.com','1979-12-04');
40、JDBC相关概念介绍

  2、新建一个Java工程,并导入数据驱动。
  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" alt="" />

  3、编写程序从user表中读取数据,并打印在命令行窗口中。
  具体代码如下:

40、JDBC相关概念介绍
 1 package me.gacl.demo;
2 import java.sql.Connection;
3 import java.sql.DriverManager;
4 import java.sql.ResultSet;
5 import java.sql.Statement;
6
7 public class JdbcFirstDemo {
8
9 public static void main(String[] args) throws Exception {
10 //要连接的数据库URL
11 String url = "jdbc:mysql://localhost:3306/jdbcStudy";
12 //连接的数据库时使用的用户名
13 String username = "root";
14 //连接的数据库时使用的密码
15 String password = "XDP";
16
17 //1.加载驱动
18 //DriverManager.registerDriver(new com.mysql.jdbc.Driver());不推荐使用这种方式来加载驱动
19 Class.forName("com.mysql.jdbc.Driver");//推荐使用这种方式来加载驱动
20 //2.获取与数据库的链接
21 Connection conn = DriverManager.getConnection(url, username, password);
22
23 //3.获取用于向数据库发送sql语句的statement
24 Statement st = conn.createStatement();
25
26 String sql = "select id,name,password,email,birthday from users";
27 //4.向数据库发sql,并获取代表结果集的resultset
28 ResultSet rs = st.executeQuery(sql);
29
30 //5.取出结果集的数据
31 while(rs.next()){
32 System.out.println("id=" + rs.getObject("id"));
33 System.out.println("name=" + rs.getObject("name"));
34 System.out.println("password=" + rs.getObject("password"));
35 System.out.println("email=" + rs.getObject("email"));
36 System.out.println("birthday=" + rs.getObject("birthday"));
37 }
38
39 //6.关闭链接,释放资源
40 rs.close();
41 st.close();
42 conn.close();
43 }
44 }
40、JDBC相关概念介绍

运行结果如下:

  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" alt="" />

2.2、DriverManager类讲解

  Jdbc程序中的DriverManager用于加载驱动,并创建与数据库的链接,这个API的常用方法:

  1. DriverManager.registerDriver(new Driver())
  2. DriverManager.getConnection(url, user, password),

  注意:在实际开发中并不推荐采用registerDriver方法注册驱动。原因有二:
    1、查看Driver的源代码可以看到,如果采用此种方式,会导致驱动程序注册两次,也就是在内存中会有两个Driver对象。
    2、程序依赖mysql的api,脱离mysql的jar包,程序将无法编译,将来程序切换底层数据库将会非常麻烦。

  推荐方式:Class.forName("com.mysql.jdbc.Driver");
  采用此种方式不会导致驱动对象在内存中重复出现,并且采用此种方式,程序仅仅只需要一个字符串,不需要依赖具体的驱动,使程序的灵活性更高。

2.3、数据库URL讲解

  URL用于标识数据库的位置,通过URL地址告诉JDBC程序连接哪个数据库,URL的写法为:

  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" alt="" />

  常用数据库URL地址的写法:

  • Oracle写法:jdbc:oracle:thin:@localhost:1521:sid
  • SqlServer写法:jdbc:microsoft:sqlserver://localhost:1433; DatabaseName=sid
  • MySql写法:jdbc:mysql://localhost:3306/sid

  如果连接的是本地的Mysql数据库,并且连接使用的端口是3306,那么的url地址可以简写为: jdbc:mysql:///数据库

2.4、Connection类讲解

  Jdbc程序中的Connection,它用于代表数据库的链接,Collection是数据库编程中最重要的一个对象,客户端与数据库所有交互都是通过connection对象完成的,这个对象的常用方法:

  • createStatement():创建向数据库发送sql的statement对象。
  • prepareStatement(sql) :创建向数据库发送预编译sql的PrepareSatement对象。
  • prepareCall(sql):创建执行存储过程的callableStatement对象。
  • setAutoCommit(boolean autoCommit):设置事务是否自动提交。
  • commit() :在链接上提交事务。
  • rollback() :在此链接上回滚事务。

2.5、Statement类讲解

  Jdbc程序中的Statement对象用于向数据库发送SQL语句, Statement对象常用方法:

  • executeQuery(String sql) :用于向数据发送查询语句。
  • executeUpdate(String sql):用于向数据库发送insert、update或delete语句
  • execute(String sql):用于向数据库发送任意sql语句
  • addBatch(String sql) :把多条sql语句放到一个批处理中。
  • executeBatch():向数据库发送一批sql语句执行。

2.6、ResultSet类讲解

  Jdbc程序中的ResultSet用于代表Sql语句的执行结果。Resultset封装执行结果时,采用的类似于表格的方式。ResultSet 对象维护了一个指向表格数据行的游标,初始的时候,游标在第一行之前,调用ResultSet.next() 方法,可以使游标指向具体的数据行,进行调用方法获取该行的数据。
  ResultSet既然用于封装执行结果的,所以该对象提供的都是用于获取数据的get方法:
  获取任意类型的数据
    getObject(int index)
    getObject(string columnName)
  获取指定类型的数据,例如:
    getString(int index)
    getString(String columnName)

  ResultSet还提供了对结果集进行滚动的方法:

  • next():移动到下一行
  • Previous():移动到前一行
  • absolute(int row):移动到指定行
  • beforeFirst():移动resultSet的最前面。
  • afterLast() :移动到resultSet的最后面。

2.7、释放资源

  Jdbc程序运行完后,切记要释放程序在运行过程中,创建的那些与数据库进行交互的对象,这些对象通常是ResultSet, Statement和Connection对象,特别是Connection对象,它是非常稀有的资源,用完后必须马上释放,如果Connection不能及时、正确的关闭,极易导致系统宕机。Connection的使用原则是尽量晚创建,尽量早的释放。
  为确保资源释放代码能运行,资源释放代码也一定要放在finally语句中。