import java.sql.*;
/**(本文来源于图老师网站,更多请访问http://m.tulaoshi.com/bianchengyuyan/)
* pTitle: JDBC连接数据库/p
* pDescription: 本实例演示如何使用JDBC连接Oracle数据库,并演示添加数据和查询数据。/p
* pCopyright: Copyright (c) 2003/p
* pFilename: JDBCConnCommit.java/p
* @version 1.0
*/
public class JDBCConnCommit{
private static String url="";
private static String username="";
private static String password="";
/**
*br方法说明:获得数据连接
*br输入参数:
*br返回类型:Connection 连接对象
*/
public Connection conn(){
try {
//加载JDBC驱动
Class.forName("oracle.jdbc.driver.OracleDriver");
//创建数据库连接
Connection con = DriverManager.getConnection(url, username, password);
return con;
}catch(ClassNotFoundException cnf){
System.out.println("driver not find:"+cnf);
return null;
}catch(SQLException sqle){
System.out.println("can´t connection db:"+sqle);
return null;
} catch (Exception e) {
System.out.println("Failed to load JDBC/ODBC driver.");
return null;
}
}
/**(本文来源于图老师网站,更多请访问http://m.tulaoshi.com/bianchengyuyan/)
*br方法说明:执行查询SQL语句
*br输入参数:Connection con 数据库连接
*br输入参数:String sql 要执行的SQL语句
*br返回类型:
*/
public void query(Connection con, String sql) throws SQLException,Exception {
try{
if(con==null){
throw new Exception("database connection can´t use!");
}
if(sql==null) throw new Exception("check your parameter: ´sql´! don´t input null!");
//声明语句
Statement stmt = con.createStatement();
//执行查询
ResultSet rs = stmt.executeQuery(sql);
ResultSetMetaData rmeta = rs.getMetaData();
//获得数据字段个数
int numColumns = rmeta.getColumnCount();
while(rs.next())
{
for(int i = 0;i numColumns;i++)
{
String sTemp = rs.getString(i+1);
System.out.print(sTemp+" ");
}
System.out.println("");
}
rs.close();
stmt.close();
}catch(Exception e){
System.out.println("query error: sql = "+sql);
System.out.println("query error:"+e);
throw new SQLException("query error");
}
}
/**
*br方法说明:执行插入、更新、删除等没有返回结果集的SQL语句
*br输入参数:Connection con 数据库连接
*br输入参数:String sql 要执行的SQL语句
*br返回类型:
*/
public void execute(Connection con, String sql) throws SQLException {
try{
if(con==null) return;
Statement stmt = con.createStatement();
int i = stmt.executeUpdate(sql);
System.out.println("update row:"+i);
stmt.close();
}catch(Exception e){
System.out.println("execute error: sql = "+sql);
System.out.println(e);
throw new SQLException("execute error");
}
}
/**
*br方法说明:实例演示
*br输入参数:
*br返回类型:
*/
public void demo(){
JDBCConnCommit oc = new JDBCConnCommit();
Connection conn = oc.conn();
try{
conn.setAutoCommit( false );
String sql = "";
for(int i=0;i4;i++){
sql = "insert into TBL_USER(id,name,password)values(seq_user.nextval,´tom´,´haorenpingan´)";
oc.execute(conn,sql);
}
sql = "select * from TBL_USER where name=´tom´ order by id";
oc.query(conn,sql);
sql = "delete from TBL_USER where name=´tom´";
oc.execute(conn,sql);
conn.commit();
}catch(SQLException se){
try{
conn.rollback();
}catch(Exception e){
}
System.out.println(se);
}catch(Exception e){
System.out.println(e);
}finally
{
try{
conn.close();
}catch(SQLException e){}
}
}
/**
*br方法说明:主方法
*br输入参数:
*br返回类型:
*/
public static void main(String[] arg){
if(arg.length!=3){
System.out.println("use: java JDBCConnCommit url username password");
return;
}
JDBCConnCommit oc = new JDBCConnCommit();
oc.url = arg[0];
oc.username=arg[1];
oc.password=arg[2];
oc.demo();
}
}