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

<%@ 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) ...{
}
}
}
%>