JDBC连接工具类
package com.ins.db;import java.io.IOException;import java.io.InputStream;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.Properties;public class DBconn {//declare var private String driver="";private String url="";private String uname="";private String passwd="";private Connection conn=null;private Statement stmt=null;private static ResultSet rs=null;private static final String DATABASE_PROPERTIES="jdbc.properties";//定义配置文件//load propertiespublic DBconn(){loadProperties();setConn();}//load confprivate void loadProperties(){InputStream in =DBconn.class.getResourceAsStream(DATABASE_PROPERTIES);//读入配置文件//定义PropertiesProperties p=new Properties();try {p.load(in);} catch (IOException e) {e.printStackTrace();}//得到配置文件并将其值赋给当前变量this.driver=p.getProperty("driver");this.url=p.getProperty("url");this.uname=p.getProperty("username");this.passwd=p.getProperty("password");}//setConnprivate void setConn(){try {Class.forName(driver); this.conn=DriverManager.getConnection(url,uname,passwd);} catch (ClassNotFoundException e) {e.printStackTrace();} catch (SQLException e) {e.printStackTrace();}}//getConnpublic Connection getConn(){return this.conn;}//=================================CRUD===========================//执行插入public void doInsert(String sql){try {stmt=conn.createStatement();stmt.executeUpdate(sql);} catch (SQLException e) {e.printStackTrace();System.err.println("db.executeInset:" + e.getMessage()); }finally{colseAll(rs,stmt,conn);}}//执行删除public void doDelete(String sql){try {stmt=conn.createStatement();stmt.executeUpdate(sql);} catch (SQLException e) {e.printStackTrace();System.err.println("db.executeInset:" + e.getMessage()); }finally{colseAll(rs,stmt,conn);}}//执行更新public void doUpdate(String sql){try {stmt=conn.createStatement();stmt.executeUpdate(sql);} catch (SQLException e) {e.printStackTrace();System.err.println("db.executeInset:" + e.getMessage()); }finally{colseAll(rs,stmt,conn);}}//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; } //=============================================CRUD end========================//close rspublic static void colseRs(ResultSet rs){if(rs!=null){try {rs.close();} catch (SQLException e) {e.printStackTrace();}rs=null;}}//close stmtpublic static void colseStmt(Statement stmt){if(stmt!=null){try {stmt.close();} catch (SQLException es) {es.printStackTrace();}stmt=null;}}//close connpublic void colseConn(Connection conn){if(conn!=null){try {conn.close();} catch (SQLException ec) {ec.printStackTrace();}conn=null;}}//close allpublic static void colseAll(ResultSet rs,Statement stmt,Connection conn){if(rs!=null){try {rs.close();} catch (SQLException e) {e.printStackTrace();}rs=null;}if(stmt!=null){try {stmt.close();} catch (SQLException es) {es.printStackTrace();}stmt=null;}if(conn!=null){try {conn.close();} catch (SQLException ec) {ec.printStackTrace();}conn=null;}}public static void main(String[] args) {DBconn db=new DBconn();String sql="select *from class";rs=db.doSelect(sql);try {while(rs.next()){System.out.println(rs.getInt(1));System.out.println(rs.getString(2));}} catch (SQLException e) {// TODO Auto-generated catch blocke.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): // 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);