JAVA_DBUtil

来源：互联网发布：mac 游戏编辑：程序博客网时间：2024/05/04 06:29

/** *DBUtil.java *连接数据库 */ import java.io.*; import java.sql.*; import java.util.Properties; public class Db { private String driver;//定义驱动 private String url;//定义URL private String user;//定义用户名 private String password;//定义密码 private Connection conn;//定义连接 private Statement stmt;//定义STMT private ResultSet rs;//定义结果集 //构造函数，默认加裁配置文件为jdbc.driver public Db(){ this("jdbc.properties"); } //有参构造函数，传入路径Conf并用方法loadProperties进行加载，用setConn进行设置 public Db(String conf) { loadProperties(conf); setConn(); } //返回Conn public Connection getConn(){ return this.conn; } //传入参数路径Conf加载配置文件取得配置文件中的参数并设置为类变量的参数 private void loadProperties(String conf){ Properties props = new Properties(); try { props.load(new FileInputStream(conf));//根据配置文件路径Conf加载配置文件 } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } this.driver = props.getProperty("driver");//从配置文件中取得相应的参数并设置类变量 this.url = props.getProperty("url"); this.user = props.getProperty("username"); this.password = props.getProperty("password"); } //implement the Connection //设置CONN private void setConn(){ try { Class.forName(driver); this.conn = DriverManager.getConnection(url,user,password); } catch(ClassNotFoundException classnotfoundexception) { classnotfoundexception.printStackTrace(); System.err.println("db: " + classnotfoundexception.getMessage()); } catch(SQLException sqlexception) { System.err.println("db.getconn(): " + sqlexception.getMessage()); } } //执行插入 public void doInsert(String sql) { try { Statement statement = conn.createStatement(); int i = stmt.executeUpdate(sql); } catch(SQLException sqlexception) { System.err.println("db.executeInset:" + sqlexception.getMessage()); }finally{ } } //执行删除 public void doDelete(String sql) { try { stmt = conn.createStatement(); int i = stmt.executeUpdate(sql); } catch(SQLException sqlexception) { System.err.println("db.executeDelete:" + sqlexception.getMessage()); } } //执行更新 public void doUpdate(String sql) { try { stmt = conn.createStatement(); int i = stmt.executeUpdate(sql); } catch(SQLException sqlexception) { System.err.println("db.executeUpdate:" + sqlexception.getMessage()); } } //查询结果集 public ResultSet doSelect(String sql) { try { stmt = conn.createStatement(java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_READ_ONLY); rs = stmt.executeQuery(sql); } catch(SQLException sqlexception) { System.err.println("db.executeQuery: " + sqlexception.getMessage()); } return rs; } /** *关闭数据库结果集，数据库操作对象，数据库链接 @Function: Close all the statement and conn int this instance and close the parameter ResultSet @Param: ResultSet @Exception: SQLException,Exception **/ public void close(ResultSet rs) throws SQLException, Exception { if (rs != null) { rs.close(); rs = null; } if (stmt != null) { stmt.close(); stmt = null; } if (conn != null) { conn.close(); conn = null; } } /** *关闭数据库操作对象，数据库连接对象 * Close all the statement and conn int this instance * @throws SQLException * @throws Exception */ public void close() throws SQLException, Exception { if (stmt != null) { stmt.close(); stmt = null; } if (conn != null) { conn.close(); conn = null; } } //测试类 public static void main(String[] args){ try{ //根据传入配置路径构造类 Db db = new Db("src//com//struts//properties//jdbc.properties"); Connection conn = db.getConn(); if(conn != null && !conn.isClosed()) { System.out.println("連結成功"); ResultSet rs = db.doSelect("select * from usertable"); while(rs.next()){ System.out.println(rs.getString(1)+":"+rs.getString(2)+":"+rs.getString(3)); } rs.close(); conn.close(); } }catch(SQLException e) { e.printStackTrace(); } } }

MySQL： String Driver="com.mysql.jdbc.Driver"; //驱动程序 String URL="jdbc:mysql://localhost:3306/db_name"; //连接的URL,db_name为数据库名 String Username="username"; //用户名 String Password="password"; //密码 Class.forName(Driver).new Instance(); Connection con=DriverManager.getConnection(URL,Username,Password);

Microsoft SQL Server 2.0驱动(3个jar的那个): String Driver="com.microsoft.jdbc.sqlserver.SQLServerDriver"; //连接SQL数据库的方法 String URL="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_name"; //db_name为数据库名 String Username="username"; //用户名 String Password="password"; //密码 Class.forName(Driver).new Instance(); //加载数据可驱动 Connection con=DriverManager.getConnection(URL,UserName,Password); //

Microsoft SQL Server 3.0驱动(1个jar的那个): // String Driver="com.microsoft.sqlserver.jdbc.SQLServerDriver"; //连接SQL数据库的方法 String URL="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_name"; //db_name为数据库名 String Username="username"; //用户名 String Password="password"; //密码 Class.forName(Driver).new Instance(); //加载数据可驱动 Connection con=DriverManager.getConnection(URL,UserName,Password); //

Sysbase: String Driver="com.sybase.jdbc.SybDriver"; //驱动程序 String URL="jdbc:Sysbase://localhost:5007/db_name"; //db_name为数据可名 String Username="username"; //用户名 String Password="password"; //密码 Class.forName(Driver).newInstance(); Connection con=DriverManager.getConnection(URL,Username,Password);

Oracle(用thin模式): String Driver="oracle.jdbc.driver.OracleDriver"; //连接数据库的方法 String URL="jdbc:oracle:thin:@loaclhost:1521:orcl"; //orcl为数据库的SID String Username="username"; //用户名 String Password="password"; //密码 Class.forName(Driver).newInstance(); //加载数据库驱动 Connection con=DriverManager.getConnection(URL,Username,Password);

PostgreSQL: String Driver="org.postgresql.Driver"; //连接数据库的方法 String URL="jdbc:postgresql://localhost/db_name"; //db_name为数据可名 String Username="username"; //用户名 String Password="password"; //密码 Class.forName(Driver).newInstance(); Connection con=DriverManager.getConnection(URL,Username,Password);

package utils; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; public class DBConnection { static Connection conn=null; static PreparedStatement ps=null; static ResultSet rs=null; static{ try { Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver"); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //静态方式取得链接 public static Connection getConn(){ String uname="sa"; String passwd=""; String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=qtliu"; try { conn=DriverManager.getConnection(url,uname,passwd); System.out.println("GetConnection success"); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return conn; } //释放资源 public static void release(){ if(rs!=null){ try { rs.close(); System.out.println("rs Closed!"); } catch (SQLException e) { e.printStackTrace(); } } if(ps!=null){ try { ps.close(); System.out.println("ps Closed!"); } catch (SQLException e) { e.printStackTrace(); } } if(conn!=null){ try { conn.close(); System.out.println("conn Closed!"); } catch (SQLException e) { e.printStackTrace(); } } } }

=====================

package utils; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class TestGetConn { /** * @param args */ public static void main(String[] args) { Connection conn=DBConnection.getConn(); try { Statement st=conn.createStatement(); String find="select *from qt"; ResultSet rs=st.executeQuery(find); while(rs.next()){ System.out.println("name:"+rs.getString(2)+"/n"); System.out.println("passwd:"+rs.getString(3)); } System.out.println(); DBConnection.release(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }

PS：orcale驱动包下载地址

http://mirrors.ibiblio.org/pub/mirrors/maven/mule/dependencies/maven2/oracle/ojdbc14/9.2.0.5/ojdbc14-9.2.0.5.jar