Java 连接mysql

今天准备用java写一个管理密码用的小软件来练练手，数据库准备用mysql，因为只安装了这一个，

java连接mysql用到了驱动JDBC

下载地址 http://mysql.cs.pu.edu.tw/Downloads/Connector-J/mysql-connector-java-5.1.2-beta.zip下载MYSQL5.1的JDBC驱动程序，解压缩到你放JDBC驱动程序的位置就可以了，不需要安装。然后设置Classpath环境变量，在Classpath环境变量里添加JDBC驱动程序，如我的是添加D:\JDBC_Driver\mysql\mysql-connector-java-5.1.2-beta\mysql-connector-java-5.1.2-beta-bin.jar。

如果这样还是找不到驱动的话，那么就右击你的工程选择最后一项properties ，然后在library中添加jdbc的jar，这样就可以了

下面是java的基本连接数据库的代码

   1:import java.sql.Connection;

   2:import java.sql.DriverManager;

   3:import java.sql.ResultSet;

   4:import java.sql.ResultSetMetaData;

   5:import java.sql.SQLException;

   6:import java.sql.Statement;

   7:  

   8:publicclass sql {

   9:  

  10:/**

  11:     * 12 * @param args 13

  12:     */

  13:publicstaticvoid main(String[] args) {

  14:         String user = "root";

  15:         String password = "6191080";

  16:         String url = "jdbc:mysql://localhost:3306/gglg";

  17:         String driver = "com.mysql.jdbc.Driver";

  18:// String driver = "org.gjt.mm.mysql.Driver";

  19:         String tableName = "article";

  20:         String sqlstr;

  21:         Connection con = null;

  22:         Statement stmt = null;

  23:         ResultSet rs = null;

  24:try {

  25:             Class.forName(driver);

  26:// connect to the sql

  27:             con = DriverManager.getConnection(url, user, password);

  28:// statement to do the sql

  29:             stmt = con.createStatement();

  30:// insert to the database

  31:// sqlstr =

  32:// "insert into "+tableName+"(title,author) values ('2000','honey')";

  33:// stmt.executeUpdate(sqlstr);

  34:  

  35:             sqlstr = "select * from " + tableName;

  36://execute the sql statement return rs

  37:             rs = stmt.executeQuery(sqlstr);

  38:

  39:             ResultSetMetaData rsmd = rs.getMetaData();

  40:

  41:             System.out.print(rsmd.getColumnName(1)+"\t");

  42:             System.out.print(rsmd.getColumnName(2)+"\t");

  43:             System.out.println(rsmd.getColumnName(3));

  44:int j = 0;

  45://get column counts

  46:             j = rsmd.getColumnCount();

  47:  

  48:while (rs.next()) {

  49:for (int i = 0; i < j; i++) {

  50:                     System.out.print(rs.getString(i + 1));

  51:                     System.out.print("\t");

  52:                 }

  53:                 System.out.println();

  54:             }

  55:         } catch (ClassNotFoundException e1) {

  56:             System.out.println("数据库驱动不存在！");

  57:             System.out.println(e1.toString());

  58:         } catch (SQLException e2) {

  59:             System.out.println("数据库存在异常！");

  60:             System.out.println(e2.toString());

  61:         } finally {

  62:try {

  63:if (rs != null)

  64:                     rs.close();

  65:if (stmt != null)

  66:                     stmt.close();

  67:if (con != null)

  68:                     con.close();

  69:             } catch (SQLException e) {

  70:                 System.out.println(e.toString());

  71:             }

  72:         }

  73:     }

  74: }