rows 是客户端传过来的行数,page是页码,传参就需要就两个参数就行,sql语句中_row 和_page 自己声明的局部变量,值还是相应的row 和page ,为了运算而已。
用数据库类获得它的DataTable,转换为json格式通过一般处理程序传到客户端,客户端显示就ok了。这里我使用的是easyui datagrid进行接收和传参。这是大体的思路。
string sql = "select top " + rows + " * from TestData where testID not in(select top " + (_rows * (_page - 1)) + " testID from TestData order by testID desc) order by testID desc";
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//DataTable 转换成json,这里带了“total”,传给客户端的数据总数,不传这个,客户端不会显示总数据是多少条多少条的。
public static string CreateJsonParameters(DataTable dt, bool displayCount, int totalcount)
{
StringBuilder JsonString = new StringBuilder();
//Exception Handling
if (dt != null )
{
JsonString.Append( "{ " );
if (displayCount)
{
JsonString.Append( "\"total\":" );
JsonString.Append(totalcount);
JsonString.Append( "," );
}
JsonString.Append( "\"rows\":[ " );
for ( int i = 0; i < dt.Rows.Count; i++)
{
JsonString.Append( "{ " );
for ( int j = 0; j < dt.Columns.Count; j++)
{
if (j < dt.Columns.Count - 1)
{
//if (dt.Rows[i][j] == DBNull.Value) continue;
if (dt.Columns[j].DataType == typeof ( bool ))
{
JsonString.Append( "\"" + dt.Columns[j].ColumnName + "\":" +
dt.Rows[i][j].ToString().ToLower() + "," );
}
else if (dt.Columns[j].DataType == typeof ( string ))
{
JsonString.Append( "\"" + dt.Columns[j].ColumnName + "\":" + "\"" +
dt.Rows[i][j].ToString().Replace( "\"" , "\\\"" ) + "\"," );
}
else
{
JsonString.Append( "\"" + dt.Columns[j].ColumnName + "\":" + "\"" + dt.Rows[i][j] + "\"," );
}
}
else if (j == dt.Columns.Count - 1)
{
//if (dt.Rows[i][j] == DBNull.Value) continue;
if (dt.Columns[j].DataType == typeof ( bool ))
{
JsonString.Append( "\"" + dt.Columns[j].ColumnName + "\":" +
dt.Rows[i][j].ToString());
}
else if (dt.Columns[j].DataType == typeof ( string ))
{
JsonString.Append( "\"" + dt.Columns[j].ColumnName + "\":" + "\"" +
dt.Rows[i][j].ToString().Replace( "\"" , "\\\"" ) + "\"" );
}
else
{
JsonString.Append( "\"" + dt.Columns[j].ColumnName+ "\":" + "\"" + dt.Rows[i][j] + "\"" );
}
}
}
/*end Of String*/
if (i == dt.Rows.Count - 1)
{
JsonString.Append( "} " );
}
else
{
JsonString.Append( "}, " );
}
}
JsonString.Append( "]" );
JsonString.Append( "}" );
return JsonString.ToString().Replace( "\n" , "" );
}
else
{
return null ;
}
}
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以上就是本文的全部内容,希望对大家的学习有所帮助。