java JDBC訪問Oracle數據庫

 Java數據庫訪問——

一、加載JDBC驅動：

 加載JDBC驅動，並將其註冊到DriverManager中，下面是一些主流數據庫的JDBC驅動加裁註冊的代碼:
  //Oracle8/8i/9iO數據庫(thin模式)
  Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
  //Sql Server7.0/2000數據庫
  Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();
  //DB2數據庫
  Class.froName("com.ibm.db2.jdbc.app.DB2Driver").newInstance();
  //Informix數據庫
  Class.forName("com.informix.jdbc.IfxDriver").newInstance();
  //Sybase數據庫
  Class.forName("com.sybase.jdbc.SybDriver").newInstance();
  //MySQL數據庫
  Class.forName("com.mysql.jdbc.Driver").newInstance();
  //PostgreSQL數據庫
  Class.forNaem("org.postgresql.Driver").newInstance();

二、創建數據庫鏈接：

 //Oracle8/8i/9i數據庫(thin模式)
  String url="jdbc:oracle:thin:@localhost:1521:orcl";
  String user="scott";
  String password="tiger";
  Connection conn=DriverManager.getConnection(url,user,password);

  //Sql Server7.0/2000數據庫
  String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=pubs";
  String user="sa";
  String password="";
  Connection conn=DriverManager.getConnection(url,user,password);

  //DB2數據庫
  String url="jdbc:db2://localhost:5000/sample";
  String user="amdin"
  String password=-"";
  Connection conn=DriverManager.getConnection(url,user,password);

  //Informix數據庫
  String url="jdbc:informix-sqli://localhost:1533/testDB:INFORMIXSERVER=myserver;user=testuser;password=testpassword";
  Connection conn=DriverManager.getConnection(url);

  //Sybase數據庫
  String url="jdbc:sybase:Tds:localhost:5007/tsdata";
  Properties sysProps=System.getProperties();
  SysProps.put("user","userid");
  SysProps.put("password","user_password");
  Connection conn=DriverManager.getConnection(url,SysProps);

  //MySQL數據庫
  String url="jdbc:mysql://localhost:3306/testDB?user=root&password=root&useUnicode=true&characterEncoding=gb2312";
  Connection conn=DriverManager.getConnection(url);

  //PostgreSQL數據庫
  String url="jdbc:postgresql://localhost/testDB";
  String user="myuser";
  String password="mypassword";
  Connection conn=DriverManager.getConnection(url,user,password);

三、創建Statement對象或PreparedStatement對象：

//創建Statement對象
  Statement stmt=conn.createStatement();
  //創建ProparedStatement對象
  String sql="select * from user where userName=? and password=?";
  PreparedStatement pstmt=Conn.prepareStatement(sql);
  pstmt.setString(1,"admin");
  pstmt.setString(2,"liubin");

四、執行sql語句：

String sql="select * from users";
  ResultSet rs=stmt.executeQuery(sql);
  //執行動態SQL查詢
  ResultSet rs=pstmt.executeQuery();
  //執行insert update delete等語句，先定義sql
  stmt.executeUpdate(sql);

五、訪問結果記錄集ResultSet對象。

while(rs.next)
  {
  out.println("你的第一個字段內容爲："+rs.getString());
  out.println("你的第二個字段內容爲："+rs.getString(2));
  }

 六、依次將ResultSet、Statement、PreparedStatement、Connection對象關閉，釋放所佔用的資源：

rs.close();
  stmt.clost();
  pstmt.close();
  con.close();

七、其餘數據庫鏈接：

MySQL：
    String Driver="com.mysql.jdbc.Driver";    //驅動程序
    String URL="jdbc:mysql://localhost:3306/db_name";    //鏈接的URL,db_name爲數據庫名
    String Username="username";    //用戶名
    String Password="password";    //密碼
    Class.forName(Driver).new Instance();
    Connection con=DriverManager.getConnection(URL,Username,Password);
Microsoft SQL Server 2.0驅動(3個jar的那個):
    String Driver="com.microsoft.jdbc.sqlserver.SQLServerDriver";    //鏈接SQL數據庫的方法
    String URL="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_name";    //db_name爲數據庫名
    String Username="username";    //用戶名
    String Password="password";    //密碼
    Class.forName(Driver).new Instance();    //加載數據可驅動
    Connection con=DriverManager.getConnection(URL,UserName,Password);    //
Microsoft SQL Server 3.0驅動(1個jar的那個): // 老紫竹完善
    String Driver="com.microsoft.sqlserver.jdbc.SQLServerDriver";    //鏈接SQL數據庫的方法
    String URL="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_name";    //db_name爲數據庫名
    String Username="username";    //用戶名
    String Password="password";    //密碼
    Class.forName(Driver).new Instance();    //加載數據可驅動
    Connection con=DriverManager.getConnection(URL,UserName,Password);    //
Sysbase:
    String Driver="com.sybase.jdbc.SybDriver";    //驅動程序
    String URL="jdbc:Sysbase://localhost:5007/db_name";    //db_name爲數據可名
    String Username="username";    //用戶名
    String Password="password";    //密碼
    Class.forName(Driver).newInstance();
    Connection con=DriverManager.getConnection(URL,Username,Password);
Oracle(用thin模式):
    String Driver="oracle.jdbc.driver.OracleDriver";    //鏈接數據庫的方法
    String URL="jdbc:oracle:thin:@loaclhost:1521:orcl";    //orcl爲數據庫的SID
    String Username="username";    //用戶名
    String Password="password";    //密碼
    Class.forName(Driver).newInstance();    //加載數據庫驅動
    Connection con=DriverManager.getConnection(URL,Username,Password);
PostgreSQL:
    String Driver="org.postgresql.Driver";    //鏈接數據庫的方法
    String URL="jdbc:postgresql://localhost/db_name";    //db_name爲數據可名
    String Username="username";    //用戶名
    String Password="password";    //密碼
    Class.forName(Driver).newInstance();
    Connection con=DriverManager.getConnection(URL,Username,Password);
DB2：
    String Driver="com.ibm.db2.jdbc.app.DB2.Driver";    //鏈接具備DB2客戶端的Provider實例
    //String Driver="com.ibm.db2.jdbc.net.DB2.Driver";    //鏈接不具備DB2客戶端的Provider實例
    String URL="jdbc:db2://localhost:5000/db_name";    //db_name爲數據可名
    String Username="username";    //用戶名
    String Password="password";    //密碼
    Class.forName(Driver).newInstance();
    Connection con=DriverManager.getConnection(URL,Username,Password);
Informix:
    String Driver="com.informix.jdbc.IfxDriver";
    String URL="jdbc:Informix-sqli://localhost:1533/db_name:INFORMIXSER=myserver";    //db_name爲數據可名
    String Username="username";    //用戶名
    String Password="password";    //密碼
    Class.forName(Driver).newInstance();
    Connection con=DriverManager.getConnection(URL,Username,Password);
JDBC-ODBC:
    String Driver="sun.jdbc.odbc.JdbcOdbcDriver";
    String URL="jdbc:odbc:dbsource";    //dbsource爲數據源名
    String Username="username";    //用戶名
    String Password="password";    //密碼
    Class.forName(Driver).newInstance();
    Connection con=DriverManager.getConnection(URL,Username,Password);

下面是我本身作的一個例子：

package dao;

import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

import bean.Tbmeet;

public class OracleDao {


    private Statement stmt = null;

    private  ResultSet rs = null;

    private Connection conn = null;

    public OracleDao(){
        this.getConnection();
    }

    public void getConnection(){
        try{
            Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
            String url="jdbc:oracle:thin:@10.11.0.31:1521:orcl"; //orcl爲數據庫的SID
            String user="meeting";
            String password="meeting";
            conn= DriverManager.getConnection(url,user,password);
        }catch (Exception e) {
            System.out.println(e);
        }
    }

    public List<Tbmeet> getRes(){
        List<Tbmeet> list = new ArrayList<Tbmeet>();
        try {
            stmt = conn.createStatement();
            rs = stmt.executeQuery("select * from tbmeetroomequipment");
            while (rs.next()) {
                Tbmeet t = new Tbmeet();
                t.setId(rs.getLong(1));
                t.setName(rs.getString(2));
                t.setEcid(rs.getLong(3));
                list.add(t);
            }
        } catch (SQLException e) {
            list = null ;
            e.printStackTrace();
        }finally{
            this.close(conn, stmt, rs);
        }
        return list;
    }

    public int delete(String sql) throws SQLException{
        int number = 0 ;
        try{
            stmt = conn.createStatement();

            number = stmt.executeUpdate(sql);

            conn.commit();
        }catch(Exception e){
            System.out.println(e);
            conn.rollback();
            number = 0 ;
        }finally{
            this.close(conn, stmt, rs);
        }
        return number;
    }

    public void close(Connection conn , Statement stmt, ResultSet rs){
        try{
            if(rs != null){
                rs.close();
                rs = null ;
            }
            if(stmt != null){
                stmt.close();
                stmt = null ;
            }
            if(conn != null){
                conn.close();
                conn = null;
            }

        }catch(Exception e){
            System.out.println(e);
        }
    }

}