本文转载:http://blog.csdn.net/limlimlim/article/details/8638080
#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(" [email protected] "); 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 ‘%‘[email protected]+‘%‘ 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
C# SQL多条件查询拼接技巧
时间: 2024-10-07 07:57:03