java连接Oracle数据库

Oracle数据库先创建一个表和添加一些数据

1.先在Oracle数据库中创建一个student表:

1 create table student
2 (
3        id number(11) not null primary key,
4        stu_name varchar(16) not null,
5        gender number(11) default null,
6        age number(11) default null,
7        address varchar(128) default null
8 );

2.向表中增添一些数据

insert into student values('1','王小军','1','17','北京市和平里七区30号楼7门102')

MyEclipse里编写java代码

1.将ojdbc6.jar导入项目中

先创建一个项目，然后在鼠标移到项目上右键-->new-->folder;folder name:lib;这样就在项目中创建了一个文件夹lib;然后将ojdbc6.jar包导入该文件夹中

该包分享地址: 链接：http://pan.baidu.com/s/1eRJbTMq 密码：eofs

鼠标移到该包上;右键-->build path-->add to build path;



2.创建一个类,开始编码

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;

public class OperateOracle {

// 定义连接所需的字符串
// 192.168.0.X是本机地址(要改成自己的IP地址)，1521端口号，XE是精简版Oracle的默认数据库名
private static String USERNAMR = "orcl";
private static String PASSWORD = "orcl";
private static String DRVIER = "oracle.jdbc.OracleDriver";
private static String URL = "jdbc:oracle:thin:@192.168.0.X:1521:xe";

// 创建一个数据库连接
Connection connection = null;
// 创建预编译语句对象，一般都是用这个而不用Statement
PreparedStatement pstm = null;
// 创建一个结果集对象
ResultSet rs = null;

/**
* 向数据库中增加数据
* 首先获取表内数据总数,总数+1为新增数据的id值
* @param stuName:学生姓名
* @param gender:学生性别,1表示男性,2表示女性
* @param age:学生年龄
* @param address:学生住址
*/
public void AddData(String stuName, int gender, int age, String address) {
connection = getConnection();
// String sql =
// "insert into student values('1','王小军','1','17','北京市和平里七区30号楼7门102')";
String sql = "select count(*) from student where 1 = 1";
String sqlStr = "insert into student values(?,?,?,?,?)";
int count = 0;

try {
// 计算数据库student表中数据总数
pstm = connection.prepareStatement(sql);
rs = pstm.executeQuery();
while (rs.next()) {
count = rs.getInt(1) + 1;
System.out.println(rs.getInt(1));
}
// 执行插入数据操作
pstm = connection.prepareStatement(sqlStr);
pstm.setInt(1, count);
pstm.setString(2, stuName);
pstm.setInt(3, gender);
pstm.setInt(4, age);
pstm.setString(5, address);
pstm.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
ReleaseResource();
}
}

/**
* 向数据库中删除数据
* @param stuName:根据姓名删除数据
*/
public void DeleteData(String stuName) {
connection = getConnection();
String sqlStr = "delete from student where stu_name=?";
System.out.println(stuName);
try {
// 执行删除数据操作
pstm = connection.prepareStatement(sqlStr);
pstm.setString(1, stuName);
pstm.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
ReleaseResource();
}
}

/**
* 向数据库中修改数据
* @param stuName:学生姓名,根据此值查询要修改的某行值
* @param gender
* @param age
* @param address
*/
public void UpdateData(String stuName, int gender, int age, String address) {
connection = getConnection();
String sql = "select id from student where 1 = 1 and stu_name = ?";
String sqlStr = "update student set stu_name=?,gender=?,age=?,address=? where id=?";
int count = 0;

try {
// 计算数据库student表中数据总数
pstm = connection.prepareStatement(sql);
pstm.setString(1, stuName);
rs = pstm.executeQuery();
while (rs.next()) {
count = rs.getInt(1);
System.out.println(rs.getInt(1));
}
// 执行插入数据操作
pstm = connection.prepareStatement(sqlStr);
pstm.setString(1, stuName);
pstm.setInt(2, gender);
pstm.setInt(3, age);
pstm.setString(4, address);
pstm.setInt(5, count);
pstm.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
ReleaseResource();
}
}

/**
* 向数据库中查询数据
*/
public void SelectData() {
connection = getConnection();
String sql = "select * from student where 1 = 1";
try {
pstm = connection.prepareStatement(sql);
rs = pstm.executeQuery();
while (rs.next()) {
String id = rs.getString("id");
String name = rs.getString("stu_name");
String gender = rs.getString("gender");
String age = rs.getString("age");
String address = rs.getString("address");
System.out.println(id + "\t" + name + "\t" + gender + "\t"
+ age + "\t" + address);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
ReleaseResource();
}
}

/**
* 使用ResultSetMetaData计算列数
*/
public void SelectData2() {
connection = getConnection();
String sql = "select * from employees where 1 = 1";
int count = 0;

try {
pstm = connection.prepareStatement(sql);
rs = pstm.executeQuery();
while (rs.next()) {
count++;
}

ResultSetMetaData rsmd = rs.getMetaData();
int cols_len = rsmd.getColumnCount();

System.out.println("count=" + count + "\tcols_len=" + cols_len);
} catch (SQLException e) {
e.printStackTrace();
} finally {
ReleaseResource();
}
}

/**
* 获取Connection对象
*
* @return
*/
public Connection getConnection() {
try {
Class.forName(DRVIER);
connection = DriverManager.getConnection(URL, USERNAMR, PASSWORD);
System.out.println("成功连接数据库");
} catch (ClassNotFoundException e) {
throw new RuntimeException("class not find !", e);
} catch (SQLException e) {
throw new RuntimeException("get connection error!", e);
}

return connection;
}

/**
* 释放资源
*/
public void ReleaseResource() {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (pstm != null) {
try {
pstm.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}

3.创建一个测试类

public class Test {

public static void main(String[] args) {
/**
* 增删改查完成,但是有一定局限性
* 1.增  问题不大
* 2.删  要给出一个值去删除(可能值不存在-->没有处理机制,值不唯一怎么处理?)
* 3.改  同删的问题
* 4.查  问题不大
*/
//创建OperateOracle对象
OperateOracle oo=new OperateOracle();
//测试增加数据操作
//oo.AddData("孙中山",1,25,"北京市海淀区红旗路111号");
//测试删除数据操作
//oo.DeleteData("孙中山");
//测试更新数据操作
oo.UpdateData("孙中山",1,30,"北京市东城区岳山路11号");
//测试查询数据操作
//oo.SelectData();

//测试ResultSetMetaData类
//oo.SelectData2();
}

}

正如测试类中所注释的,此处只可按照正确的方式去连接Oracle数据库,操作增删改查操作,但是对于一些错误操作的处理机制还不够完善。