C# SQL 多条件查询技巧

2013-03-05 15:04  5843人阅读  评论(0)  收藏  举报

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C#_sql多条件查询技巧

            #region 多条件搜索时，使用List集合来拼接条件（拼接sql）

            StringBuilder sql = new StringBuilder("select * from PhoneNum");
            List<string> wheres = new List<string>();
            if (cboGroup.Selectedindex != 0)
            {
                wheres.Add(" ptypeid=" + cboGroup.Text.Split('|')[0]);
            }

            if (txtSearchName.Text.Trim().Length > 0)
            {
                 wheres.Add(" pname like '%" + txtSearchName.Text.Trim() + "%'");
            }

            if (txtSearchCellPhone.Text.Trim().Length > 0)
            {
                 wheres.Add(" pcellphone like '%" + txtSearchCellPhone.Text.Trim() + "%'");
            }

            //判断用户是否选择了条件
            if (wheres.Count > 0)
            {
                string wh = string.Join(" and ",wheres.ToArray());
                sql.Append(" where " + wh);
            }
            #endregion

 

 

 

            #region 多条件搜索使用带参数的sql语句

            StringBuilder sql = new StringBuilder("select * from PhoneNum");
            List<string> wheres = new List<string>();
            List<sqlParameter> listParameter = new List<sqlParameter>();

            if (cboGroup.Selectedindex != 0)
            {
                wheres.Add(" ptypeid=@typeid ");
                listParameter.Add(new sqlParameter("@typeid",cboGroup.Text.Split('|')[0]));
            }

            if (txtSearchName.Text.Trim().Length > 0)
            {
                wheres.Add(" pname like @pname ");
                //pname like '%乔%'
                //pname liek '%'+@pname+'%'
                listParameter.Add(new sqlParameter("@pname","%" + txtSearchName.Text.Trim() + "%"));
            }

            if (txtSearchCellPhone.Text.Trim().Length > 0)
            {
                wheres.Add(" pcellphone like @cellphone ");
                listParameter.Add(new sqlParameter("@cellphone","%" + txtSearchCellPhone.Text.Trim() + "%"));
            }

            //判断用户是否选择了条件
            if (wheres.Count > 0)
            {
                string wh = string.Join(" and ",wheres.ToArray());
                sql.Append(" where " + wh);
            }

 

            sqlHelper.ExecuteDataTable(sql.ToString(),listParameter.ToArray());
            #endregion