java jdbc数据库连接

JAVA CODE:

package com.test.mianshi;

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 JDBConnection {
         public Connection conn = null; // 声明Connection对象的实例
         public Statement stmt = null; // 声明Statement对象的实例
         public ResultSet rs = null; // 声明ResultSet对象的实例
        
         private static String dbClassName = "com.microsoft.jdbc.sqlserver.SQLServerDriver"; //定义保存数据库驱动的变量
         private static String dbUrl = "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=DB_ATM";
        private static String dbUser = "sa";
        private static String dbPwd = "sa";

        public JDBConnection(String propertyFileName) {// 带属性文件名的构造方法
                Properties prop = new Properties();// 属性集合对象
                InputStream is = null;
                try {
                        is = JDBConnection.class.getClassLoader().getResourceAsStream(
                                        propertyFileName);// 属性文件输入流
                        // is = new FileInputStream("src/" + propertyFileName);
                        prop.load(is);// 将属性文件流装载到Properties对象中
                        is.close();// 关闭流
                        dbClassName = prop.getProperty("dbClassName");
                        dbUrl = prop.getProperty("dbUrl");
                        dbUser = prop.getProperty("dbUser");
                        dbPwd = prop.getProperty("dbPwd");
                } catch (Exception e) {
                        System.out.println("属性文件    " + propertyFileName + " 打开失败！");
                }
                try {

                        Class.forName(dbClassName);// 1.注册驱动
                } catch (ClassNotFoundException e) {
                        e.printStackTrace();
                }
        }

        public JDBConnection() {// 默认的不带参数的构造函数
                try {

                        Class.forName(dbClassName);// 1.注册驱动
                } catch (ClassNotFoundException e) {
                        e.printStackTrace();
                }
        }

        public static Connection getConnection() {
                Connection conn = null;
                try {
                        // Class.forName(dbClassName);// 1.注册驱动
                        conn = DriverManager.getConnection(dbUrl, dbUser, dbPwd);//2.建立与数据库的链接
                } catch (Exception ee) {
                        ee.printStackTrace();
                }
                if (conn == null) {
                        System.err
                                        .println("警告: DbConnectionManager.getConnection() 获得数据库链接失败.\r\n\r\n链接类型:"
                                                        + dbClassName
                                                        + "\r\n链接位置:"
                                                        + dbUrl
                                                        + "\r\n用户/密码"
                                                        + dbUser + "/" + dbPwd);
                }
                return conn;
        }

        /*
         * 功能：执行查询语句
         */
        public ResultSet executeQuery(String sql) {
                try { // 捕捉异常
                        conn = getConnection(); // 调用getConnection()方法构造Connection对象的一个实例conn
                        stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,//3.创建语句
                                        ResultSet.CONCUR_READ_ONLY);
                        rs = stmt.executeQuery(sql);//4.执行查询
                } catch (SQLException ex) {
                        System.err.println(ex.getMessage()); // 输出异常信息
                }
                return rs; // 返回结果集对象 5.结果处理
        }

        /*
         * 功能:执行更新操作
         */
        public int executeUpdate(String sql) {
                int result = 0; // 定义保存返回值的变量
                try { // 捕捉异常
                        conn = getConnection(); // 调用getConnection()方法构造Connection对象的一个实例conn
                        stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
                                        ResultSet.CONCUR_READ_ONLY);
                        result = stmt.executeUpdate(sql); // 执行更新操作
                } catch (SQLException ex) {
                        result = 0; // 将保存返回值的变量赋值为0
                }
                return result; // 返回保存返回值的变量
        }

        /*
         * 功能:关闭数据库的连接
         */
        public void close() {//6.释放资源
                try { // 捕捉异常
                        try {
                                if (rs != null) { // 当ResultSet对象的实例rs不为空时
                                        rs.close(); // 关闭ResultSet对象
                                }
                        } finally {
                                try {
                                        if (stmt != null) { // 当Statement对象的实例stmt不为空时
                                                stmt.close(); // 关闭Statement对象
                                        }
                                } finally {
                                        if (conn != null) { // 当Connection对象的实例conn不为空时
                                                conn.close(); // 关闭Connection对象
                                        }
                                }
                        }
                } catch (Exception e) {
                        e.printStackTrace(System.err); // 输出异常信息
                }
        }

}

属性文件
dbClassName=com.microsoft.jdbc.sqlserver.SQLServerDriver
dbClassName2=com.mysql.jdbc.Driver
dbPwd=sa
dbPwd2=root
dbUrl=jdbc\:microsoft\:sqlserver\://localhost\:1433;DatabaseName\=DB_ATM
dbUrl2=jdbc\:mysql\://localhost\:3306/db_atm
dbUser=sa
dbUser2=root

java各种数据库连接:

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);