LINQ和DataView和DataTable的Select实现模糊查询效率谁高?

发布网友 发布时间：2022-04-11 04:27

我来回答

共2个回答

懂视网 时间：2022-04-11 08:49

try

            {

                //先判断数据是否完整，例如分差，学校表和专业是否导入

                /*

                var cx_fsd = from aa in sjklj.zy_fswc

                             where aa.nd >= DateTime.Now.Year - 1 && aa.nd <= DateTime.Now.Year

                             && aa.lb.Contains("文科") && aa.lb.Contains("理科")

                             select aa;

                if(cx_fsd.Count()==0)

                {

                    this.Lbl_ts.Text = "zy_fswc：分数段数据没有或者不完整";

                    return;

                }

                 */

                //还有zy_school以及zy_school_zy类似的查询---处理中

                 string conn = "Data Source=.;Initial Catalog=jfzytb;Integrated Security=True";

                 string cmdtxt = string.Format("select * from zy_school where nd={0} and lb in (‘{1}‘,‘{2}‘)",

                     DateTime.Now.Year - 1, "文科", "理科");

                 System.Data.DataTable dt_school = gj.sqlcx(conn, cmdtxt);

                 if (dt_school.Select("lb=‘文科‘").Count() == 0 || dt_school.Select("lb=‘理科‘").Count() == 0)

                 {   

                     this.Lbl_ts.Text = " zy_school：高校与分数表数据不完整";

                     return;

                 }

                 cmdtxt = string.Format("select * from zy_school_zy where nd={0} and lb in (‘{1}‘,‘{2}‘)",

                      DateTime.Now.Year - 1, "文科", "理科");

                 System.Data.DataTable dt_school_zy = gj.sqlcx(conn, cmdtxt);

                 if (dt_school_zy.Select("lb=‘文科‘").Count() == 0 || dt_school_zy.Select("lb=‘理科‘").Count() == 0)

                 {

                     this.Lbl_ts.Text = "zy_school_zy:高校与专业以及分数表数据不完整";

                     return;

                 }

                 cmdtxt = string.Format("select * from zy_fswc where nd in ({0},{1}) and lb in (‘{2}‘,‘{3}‘)",

                      DateTime.Now.Year - 1,DateTime.Now.Year, "文科", "理科");

                 System.Data.DataTable dt_fc = gj.sqlcx(conn, cmdtxt);

                 if (dt_fc.Select("lb=‘文科‘").Count() == 0 || dt_fc.Select("lb=‘理科‘").Count() == 0

                     || dt_fc.Select(string.Format("nd={0}", DateTime.Now.Year - 1)).Count() == 0 || 

                     dt_fc.Select(string.Format("nd={0}", DateTime.Now.Year)).Count() == 0)

                 {

                     this.Lbl_ts.Text = "zy_fswc:分数段数据没有或者不完整";

                     return;

                 }

                var cx_xx = from aa in sjklj.zy_school

                            select aa;

                foreach (var kk in cx_xx)

                {

                    string dm = kk.dm;

                    string xxmc = kk.xxmc;

                    string pc = kk.pc;

                    int? nd = kk.nd;

                    string lb = kk.lb;

                    string zymc = "";

                    //文科，理科（学校代码和批次相同，可能类别文理科不同）,同一批次，年度，类别，只要代码相同即可

                    //就指向的是同一个学校，因此，代码和学校名称必须完全检查(学校名单和专业表名单认真筛选查找修改核实)，学校名称也匹配则更具有精确性

                    var cx_xxzy = from bb in sjklj.zy_school_zy

                                  where bb.dm == dm && bb.pc == pc  && bb.nd == nd && bb.lb == lb

                                  select bb;//找到该学校的专业

                    if (cx_xxzy.Count() > 0)

                    {

                        foreach (var gg in cx_xxzy)

                        {

                            zymc += gg.zymc + " ";

                        }

                    }

                    if (zymc != string.Empty)

                    {

                        kk.zymc = zymc;

                    }

                }

                sjklj.SaveChanges();

                System.Threading.Thread.Sleep(200);

                this.Lbl_ts.Text = "专业已经附加到学校名单表中";

            }

            catch (Exception err)

            {

                this.Lbl_ts.Text = err.Message;

            }

sql查询和linq以及datadrow的再次查询的组合使用

标签：adr   sel   lin   检查   查找   HERE   thread   tab   ted   

热心网友 时间：2022-04-11 05:57