Java连接MySql的详细介绍

2020-01-18 23:46:17

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　　现在工程(不是Src)上右键--Build Path--Add External Archives,选择驱动下的那个jar包，这是release版本，bin目录下的是debug版本。

　　示例在docs下的connector-j.html，里面有例子（其中的test是数据库名，换位自己的）。

import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.SQLException;
 Connection conn = null;
 ...
 try {
     conn =
        DriverManager.getConnection("jdbc:mysql://localhost/test?" +
                                    "user=monty&password=greatsqldb");
     // Do something with the Connection
    ...
 } catch (SQLException ex) {
     // handle any errors
     System.out.println("SQLException: " + ex.getMessage());
     System.out.println("SQLState: " + ex.getSQLState());
     System.out.println("VendorError: " + ex.getErrorCode());
 }

　　2.可以直接在MySql控制台下创建数据库，也可以在通过执行 "/. 绝对路径名"。

　　“--”是注释符。

复制代码代码如下:

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

 public class mysql {

     /**
      * @param args
      */
     public static void main(String[] args) {// 多个try合并到一块,然后使用source --- format
         // TODO Auto-generated method stub
         //若是用到finally则需要把声明放在try外边
         Connection conn = null;
         Statement stmt = null;
         ResultSet rs = null;

         try {
             Class.forName("com.mysql.jdbc.Driver");// 后面若是加上".newInstance"则还需要加上几个抛出异常
             conn = DriverManager.getConnection("jdbc:mysql://localhost/mydata?"
                     + "user=root&password=root");
             /*
              * java.sql.Statement; 不是com.mysql这个包； 二者不可以同时存在
              */
             stmt = conn.createStatement();
             rs = stmt.executeQuery("select * from info");

             while (rs.next()) {
                 System.out.println(rs.getString("name"));

             }

             // Do something with the Connection
         } catch (ClassNotFoundException ex) {
             // handle any errors
             ex.printStackTrace();

         } catch (SQLException ex) {
             // TODO Auto-generated catch block
             System.out.println("SQLException: " + ex.getMessage());
             System.out.println("SQLState: " + ex.getSQLState());
             System.out.println("VendorError: " + ex.getErrorCode());
         } finally {
             try {
                 if(null!= rs) {
                     rs.close();
                     rs = null;
                 }

                 if(null!= stmt) {
                     stmt.close();
                     stmt = null;
                 }

                 if(null!= conn) {
                     conn.close();
                     conn = null;
                 }

             } catch(SQLException e) {
                 e.printStackTrace();
             }
         }

     }

 }