oracle ，mysql，postgres jdbc配置文件

#db mysql
#jdbc.driver=com.mysql.jdbc.Driver
#jdbc.url=jdbc:mysql://localhost:3306/mysql?&useUnicode=true&characterEncoding=utf-8&autoReconnect=true&failOverReadOnly=false&zeroDateTimeBehavior=convertToNull
#jdbc.username=root
#jdbc.password=
#在xml配置文件中，url中的&符号需要转义成&。比如在tomcat的server.xml中配置数据库连接池时，mysql jdbc url样例如下
#jdbc:mysql://localhost:3306/test?user=root&password=&useUnicode=true&characterEncoding=utf-8

#db oracle
#jdbc.driver=oracle.jdbc.driver.OracleDriver
#jdbc.url="jdbc:oracle:thin:@192.168.8.1:1521:orcl
#jdbc.username=root
#jdbc.password=
#http://www.oracle.com/technetwork/database/features/jdbc/index-091264.html

#db postgress
jdbc.driver=org.postgresql.Driver
jdbc.url=jdbc:postgresql://localhost/soft
jdbc.username=postgres
jdbc.password=postgres
#https://jdbc.postgresql.org/download.html

package com.sdzw.wgn;

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Connection;
import java.sql.Statement;  

public class JDBC_Test {

    public void test() {
        Connection conn =  null;
        // MySQL的JDBC URL编写方式：jdbc:mysql://主机名称：连接端口/数据库的名称?参数=值
        // 避免中文乱码要指定useUnicode和characterEncoding
        String url = "jdbc:mysql://localhost:3306/test?"
                + "user=root&password=123456&useUnicode=true&characterEncoding=UTF8";
        try {  

            // 之所以要使用下面这条语句，是因为要使用MySQL的驱动，所以我们要把它驱动起来，
            // 可以通过Class.forName把它加载进去，也可以通过初始化来驱动起来，下面三种形式都可以
            Class.forName("com.mysql.jdbc.Driver");// 动态加载mysql驱动
            // or:
            // com.mysql.jdbc.Driver driver = new com.mysql.jdbc.Driver();
            // or：
            // new com.mysql.jdbc.Driver();
            System.out.println("成功加载MySQL驱动程序");
            // 一个Connection代表一个数据库连接
            conn = DriverManager.getConnection(url);
            // Statement里面带有很多方法，比如executeUpdate可以实现插入，更新和删除等
            Statement stmt = conn.createStatement();
            String sql = "create table student(NO char(20),name varchar(20),primary key(NO))";
            int result = stmt.executeUpdate(sql);// executeUpdate语句会返回一个受影响的行数，如果返回-1就没有成功  

            if (result != -1) {
                System.out.println("创建数据表成功");
                sql = "insert into student(NO,name) values('2016001','刘大')";
                result = stmt.executeUpdate(sql);
                sql = "insert into student(NO,name) values('2016002','陈二')";
                result = stmt.executeUpdate(sql);
                sql = "select * from student";
                ResultSet rs = stmt.executeQuery(sql);// executeQuery会返回结果的集合，否则返回空值
                System.out.println("学号\t姓名");
                while (rs.next()) {
                    System.out.println(rs.getString(1)+ "\t" + rs.getString(2));// 入如果返回的是int类型可以用getInt()
                }
            }
        } catch(SQLException e) {
            System.out.println("MySQL操作错误");
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {

    }

}

    public void getJDBCPros(String path) throws IOException {
        Properties properties = new Properties();
        InputStream in = new BufferedInputStream(new FileInputStream(path));
        properties.load(in);

        String driver = properties.getProperty("jdbc.driver");
        String url = properties.getProperty("jdbc.url");
        String username = properties.getProperty("jdbc.username");
        String password = properties.getProperty("jdbc.password");
    }