jsp百例课程代码（二）

package com.core; import java.sql.*; public class ConnDB{ Connection conn=null; Statement stmt=null; ResultSet rs=null; public ConnDB(){ try{ Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver"); }catch(java.lang.ClassNotFoundException e){ System.err.println(e.getMessage()); } } /*************************************************** *method name: executeQuery() *功能:执行查询操作 *return value: ResultSet ****************************************************/ public ResultSet executeQuery(String sql){ try{ conn=DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_database02;user=sa;password="); stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY); rs=stmt.executeQuery(sql); }catch(SQLException ex){ System.err.println(ex.getMessage()); }finally{} return rs; } /*************************************************** *method name: executeUpdate() *功能:执行更新操作 *return value: int ****************************************************/ public int executeUpdate(String sql){ int result=0; try{ conn=DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_database02;user=sa;password="); stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY); result=stmt.executeUpdate(sql); }catch(SQLException ex){ result=0; }finally{} return result; } /*************************************************** *method name: close() *功能:关闭数据库链接 *return value: void ****************************************************/ public void close(){ try { if (rs != null) rs.close(); } catch (Exception e) { e.printStackTrace(System.err); }finally{} try { if (stmt != null) stmt.close(); } catch (Exception e) { e.printStackTrace(System.err); }finally{} try { if (conn != null) { conn.close(); } } catch (Exception e) { e.printStackTrace(System.err); }finally{} } }