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:
create table student ( id number(11) not null primary key, stu_name varchar(16) not null, gender number(11) default null, age number(11) default null, address varchar(128) default null );
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
该包下载地址链接：http://wd.jb51.net:81//201612/yuanma/ojdbc6_jb51.rar
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;
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();
}
}
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();
}
}
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();
}
}
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();
}
}
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();
}
}
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;
}
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) {
//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。
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