导出数据库数据的方法，适合简单的数据库表格结构

1 如果是导出数据库，可以用java调用数据库的备份SQl语句
2 如果仅仅导出数据，请参考如下样例，其中tablename是表格的名字，pk指是否包含主键
注意：对于二进制和包含特殊字符的字段数据，需要额外处理，目前这个只能用于最简单的。
另：可参考 phpMyAdmin的导出功能
本代码采用SQL Server 2000 数据库

[code=Java]
<%@ page language= "java" contentType= "text/html; charset=GBK" pageEncoding= "GBK"%>
<%@ page import= "java.sql.*"%>
<%
     boolean showPK = ParamUtils.getIntParameter(request, "pk", 0) == 1;
    String tableName = request.getParameter( "tablename");
     if (tableName == null || tableName.trim().length() == 0) ...{
        out.println( "表格名称为空!");
         return;
    }

    Connection con = null;
    Statement stat = null;
    ResultSet rs = null;
     try ...{

        con = Factory.getDataSource().getConnection();
         if (con == null) ...{
            out.println( "得到数据库连接失败!");
             return;
        }
        stat = con.createStatement();
        rs = stat.executeQuery( "select * from " + tableName + " " + NoNull.toString(request.getParameter( "sql")));

         if(showPK)...{
            out.print( "SET IDENTITY_INSERT dbo."+tableName+ " ON<br>");
        }
        
        ResultSetMetaData md = rs.getMetaData();
        String[] fieldNames = new String[md.getColumnCount()];
        StringBuilder builder = new StringBuilder( "insert into " + tableName + "(");
         for ( int i = 0; i < md.getColumnCount(); i++) ...{
            fieldNames[i] = md.getColumnName(i + 1);
             if (!showPK && fieldNames[i].equalsIgnoreCase( "ID")) ...{
         continue;
            }
            builder.append(fieldNames[i] + ",");
        }
         // 去掉最后一个逗号
        builder.deleteCharAt(builder.length() - 1);
        builder.append( ") values(");
        StringBuilder line = new StringBuilder();
        String value;
         while (rs.next()) ...{
            line.delete(0, line.length());
            line.append(builder.toString());
             for ( int i = 0; i < fieldNames.length; i++) ...{
         if (!showPK && fieldNames[i].equalsIgnoreCase( "ID")) ...{
             continue;
        }
        value = rs.getString(fieldNames[i]);
         if (value == null) ...{
            line.append( "null,");
        } else ...{
            line.append( "'");
            line.append(value);
            line.append( "',");
        }
            }
            line.deleteCharAt(line.length() - 1);
            line.append( ");");
            out.println(line.toString() + "<br/>");
        }
         if(showPK)...{
            out.print( "SET IDENTITY_INSERT dbo."+tableName+ " OFF<br>");
        }
    } catch (Exception ex) ...{
        out.print(ex);
    } finally ...{
         if (stat != null) ...{
             try ...{
        stat.close();
            } catch (Exception ex) ...{
            }
        }
         if (con != null) ...{
             try ...{
        con.close();
            } catch (Exception ex) ...{
            }
        }
    }
%>
[/code]