假设在本地搭一个server和mysql数据库环境，假设使用java来訪问数据库

我们能够使用speedamp来搭一个server环境,能够在http://download.csdn.net/detail/baidu_nod/7630265下载

解压后无需安装直接能够使用。点击SpeedAMP.exe,然后能够通过http://localhost/phpmyadmin/index.php来訪问本地数据库

java能够通过jdbc来訪问数据库,比較重要的是下载一个mysql-connector-java-5.1.22-bin.jar文件，然后在javaproject中引用,

在代码里能够这样来訪问:

import java.sql.*;

public class ConnTest {

	 public static final String _ID = "_id";
	 public static final String TABLE_NAME = "spider";
	 public static final String NAME = "name";
	 public static final String CLASS_NAME = "class";
	 private static final String CREATE_TABLE_STMT =
	            "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + " ("
	          + _ID + " INTEGER PRIMARY KEY,"
	          + NAME 		+ " TEXT,"
	          + CLASS_NAME		+ " TEXT"
	          + ");";
	 
	public static void main(String[] args) {
		java.sql.Connection conn = null;
		Statement st = null;
		ResultSet rs = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");//载入jar包
			conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8","root","");//取得数据库连接
			
			//这个是创建一个表
			st = conn.createStatement();
			st.execute(CREATE_TABLE_STMT);
			
			//这是插入一条语句
//			st = conn.createStatement();
//			String sql = "insert into spider(_id,name,class) values ('1','xiaoming','A')";
//			st.executeUpdate(sql);
			
			
			//这是採用preparedStatement实现的插入一条语句
//			String sql = "insert into spider(_id,name,class) values (?,?,?)";
//			PreparedStatement _prepInsert = conn.prepareStatement(sql);
//			_prepInsert.setInt(1, 2);
//			_prepInsert.setString(2, "xiaoli");
//			_prepInsert.setString(3, "B");
//			_prepInsert.executeUpdate();
			
			
//			//这是一条更新语句
//			st = conn.createStatement();
//			String sql = "update spider set class = 'C' where _id = '1'";
//			st.executeUpdate(sql);
			
			
//			//这是一条删除语句
//			st = conn.createStatement();
//			String sql = "delete from spider where _id = '1'";
//			st.executeUpdate(sql);
			
			
			
			//这是查询语句
			st = conn.createStatement();
			String sql = "select * from spider";
			rs = st.executeQuery(sql);
			while(rs.next()){
				int id = rs.getInt("_id");
				String name = rs.getString("name");
				String class1 = rs.getString("class");
				System.out.println("id="+id+" name="+name+" class1="+class1);

			}
			
		}catch(Exception e){
			e.printStackTrace();
		}
		
		if(rs != null)
		{
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		
		
		if(st != null)
		{
			try {
				st.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if(conn != null)
		{
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}
}

我们能够通过这样的方式来锻炼写sql语句