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 ; } } |
以上就是本文的全部内容,希望对大家的学习有所帮助。