SQL 空格的处理

关键的两句：

if (cityTypes == "city") { sqlw = sqlw + "  AND ltrim(rtrim(cropsType.city))='" + swheres.Trim() + "' "; }
                else { sqlw = sqlw + "  AND  SUBSTRING(ltrim(rtrim(cropsType.town)),1,2)='" + swheres.Trim() + "' "; }      

ltrim(rtrim())是SQL语句中去除文本前后的空格的函数，ltrim()去除文本前的空格，rtrim()去除文本后的空格，

object.Trim()是C#中的去除文本前后的空格的函数

            string swheres = context.Request["swhere"];
            string sqlw = null;
            string specieTypes = context.Request["stype"];
            string cityTypes = context.Request["cType"];
            sqlw = " SELECT * FROM cropsType INNER JOIN cropMenu ON cropMenu.LallId = cropsType.LallId ";
            if ((!String.IsNullOrEmpty(swheres)) && (swheres!="福建"))//strWhere.Trim()!=""
            {
                if (cityTypes == "city") { sqlw = sqlw + "  AND ltrim(rtrim(cropsType.city))='" + swheres.Trim() + "' "; }
                else { sqlw = sqlw + "  AND  SUBSTRING(ltrim(rtrim(cropsType.town)),1,2)='" + swheres.Trim() + "' "; }                          //if (cityTypes == "city") { sqlw = sqlw + "  AND cropsType.city  like '%" + swheres.Substring(0, 2).Trim() + "%'";}
                //else { sqlw = sqlw + "  AND cropsType.town  like '%" + swheres.Substring(0, 2).Trim() + "%'"; }
            }
            if (!String.IsNullOrEmpty(specieTypes))//strWhere.Trim()!=""
            {
                sqlw = sqlw + "  AND cropMenu.Lcrop='" + specieTypes.Trim() + "' ";               
            }
            DataTable dtType = SqlAdapter(sqlw);           
            string jsonType = DataTableJson(dtType);//转换成json数据格式   
            context.Response.Write(jsonType);