Can not issue NULL query. with root cause
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<%
String drivername="com.mysql.jdbc.Driver"; //驱动程序名
String username="root"; //用户名
String password="cjy4286"; //密码
String db_name="jsp"; //数据库名
String url="jdbc:mysql://localhost/"+db_name+"?user="+username+"&password="+password; //连接字符串
Class.forName("com.mysql.jdbc.Driver").newInstance();
java.sql.Connection conn=DriverManager.getConnection(url);
java.sql.Statement statement=conn.createStatement();
String sqlcmd=request.getParameter("sqlcmd");
String strpage=request.getParameter("strpage");
%>
<%
if(strpage==null)
{intpage=1;}
else
{
intpage=java.lang.Integer.parseInt(strpage);
if(intpage<1) intpage=1;
}
%>
<%
//动态执行分页查询SQL
java.sql.ResultSet rs=statement.executeQuery(sqlcmd);
rs.last();
//得到数据集中总记录数
recordcount=rs.getRow();
数据库连接都对,元素也对。但出现HTTP Status 500 -。给出的原因是 Can not issue NULL query. with root cause。这怎么改啊??
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