Oracle數據庫先創建一個表和添加一些數據
1.先在Oracle數據庫中創建一個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.向表中增添一些數據
insert into student values('1','王小軍','1','17','北京市和平裡七區30號樓7門102')
MyEclipse裡編寫java代碼
1.將ojdbc6.jar導入項目中
先創建一個項目，然後在鼠標移到項目上右鍵-->new-->folder;folder name:lib;這樣就在項目中創建了一個文件夾lib;然後將ojdbc6.jar包導入該文件夾中
該包分享地址: 鏈接：http://pan.baidu.com/s/1eRJbTMq 密碼：eofs
鼠標移到該包上;右鍵-->build path-->add to build path;
2.創建一個類,開始編碼
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 {
// 定義連接所需的字符串
// 192.168.0.X是本機地址(要改成自己的IP地址)，1521端口號，XE是精簡版Oracle的默認數據庫名
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";
// 創建一個數據庫連接
Connection connection = null;
// 創建預編譯語句對象，一般都是用這個而不用Statement
PreparedStatement pstm = null;
// 創建一個結果集對象
ResultSet rs = null;
/**
* 向數據庫中增加數據
* 首先獲取表內數據總數,總數+1為新增數據的id值
* @param stuName:學生姓名
* @param gender:學生性別,1表示男性,2表示女性
* @param age:學生年齡
* @param address:學生住址
*/
public void AddData(String stuName, int gender, int age, String address) {
connection = getConnection();
// String sql =
// "insert into student values('1','王小軍','1','17','北京市和平裡七區30號樓7門102')";
String sql = "select count(*) from student where 1 = 1";
String sqlStr = "insert into student values(?,?,?,?,?)";
int count = 0;
try {
// 計算數據庫student表中數據總數
pstm = connection.prepareStatement(sql);
rs = pstm.executeQuery();
while (rs.next()) {
count = rs.getInt(1) + 1;
System.out.println(rs.getInt(1));
}
// 執行插入數據操作
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();
}
}
/**
* 向數據庫中刪除數據
* @param stuName:根據姓名刪除數據
*/
public void DeleteData(String stuName) {
connection = getConnection();
String sqlStr = "delete from student where stu_name=?";
System.out.println(stuName);
try {
// 執行刪除數據操作
pstm = connection.prepareStatement(sqlStr);
pstm.setString(1, stuName);
pstm.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
ReleaseResource();
}
}
/**
* 向數據庫中修改數據
* @param stuName:學生姓名,根據此值查詢要修改的某行值
* @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 {
// 計算數據庫student表中數據總數
pstm = connection.prepareStatement(sql);
pstm.setString(1, stuName);
rs = pstm.executeQuery();
while (rs.next()) {
count = rs.getInt(1);
System.out.println(rs.getInt(1));
}
// 執行插入數據操作
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();
}
}
/**
* 向數據庫中查詢數據
*/
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計算列數
*/
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();
}
}
/**
* 獲取Connection對象
*
* @return
*/
public Connection getConnection() {
try {
Class.forName(DRVIER);
connection = DriverManager.getConnection(URL, USERNAMR, PASSWORD);
System.out.println("成功連接數據庫");
} catch (ClassNotFoundException e) {
throw new RuntimeException("class not find !", e);
} catch (SQLException e) {
throw new RuntimeException("get connection error!", e);
}
return connection;
}
/**
* 釋放資源
*/
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.創建一個測試類
public class Test {
public static void main(String[] args) {
/**
* 增刪改查完成,但是有一定局限性
* 1.增 問題不大
* 2.刪 要給出一個值去刪除(可能值不存在-->沒有處理機制,值不唯一怎麼處理?)
* 3.改 同刪的問題
* 4.查 問題不大
*/
//創建OperateOracle對象
OperateOracle oo=new OperateOracle();
//測試增加數據操作
//oo.AddData("孫中山",1,25,"北京市海澱區紅旗路111號");
//測試刪除數據操作
//oo.DeleteData("孫中山");
//測試更新數據操作
oo.UpdateData("孫中山",1,30,"北京市東城區岳山路11號");
//測試查詢數據操作
//oo.SelectData();
//測試ResultSetMetaData類
//oo.SelectData2();
}
}
正如測試類中所注釋的,此處只可按照正確的方式去連接Oracle數據庫,操作增刪改查操作,但是對於一些錯誤操作的處理機制還不夠完善。
