Java_DBUtil
/***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");// db.loadProperties("src\\com\\struts\\properties\\jdbc.properties");// System.out.print(db.driver); //取得连接 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(); } }}//配置文件jdbc.propertiesdriver=com.microsoft.jdbc.sqlserver.SQLServerDriverurl=jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=qtliuusername=sapassword=sa
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): // 老紫竹完善 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);DB2： String Driver="com.ibm.db2.jdbc.app.DB2.Driver"; //连接具有DB2客户端的Provider实例 //String Driver="com.ibm.db2.jdbc.net.DB2.Driver"; //连接不具有DB2客户端的Provider实例 String URL="jdbc:db2://localhost:5000/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);Informix: String Driver="com.informix.jdbc.IfxDriver"; String URL="jdbc:Informix-sqli://localhost:1533/db_name:INFORMIXSER=myserver"; //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);JDBC-ODBC: String Driver="sun.jdbc.odbc.JdbcOdbcDriver"; String URL="jdbc:odbc:dbsource"; //dbsource为数据源名 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 blocke.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 blocke.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();} }}
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