JAVA学习

				import java.sql.*;
				public class  ConDB{
					// jdbc-odbc驱动
				String sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";
				 // 指定要访问的数据库
				String sConnStr = "jdbc:odbc:course";
				Connection conn = null;
				ResultSet rs = null;
				public ConDB() {
				try {
					// 注册jdbc驱动程序
				Class.forName(sDBDriver); 
				}
				catch(java.lang.ClassNotFoundException e) {
				System.err.println("course(): " + e.getMessage());
				}
				}
				
				public ResultSet executeQuery(String sql) {
				rs = null;
				try {
					// 连接数据库
				conn = DriverManager.getConnection(sConnStr); 
				 // 执行查询操作
				Statement stmt = conn.createStatement();
				rs = stmt.executeQuery(sql);
				} 
				catch(SQLException ex) { 
				System.err.println("executeQuery: " + ex.getMessage());
				}
				return rs;
				}
				}