时间:2021-07-01 10:21:17 帮助过:24人阅读
大家看到现有的大多数ERP系统向用户展示的都是中文的字段名,如果维护过ERP就会发现后台的数据库里面用的都是英文字段名的,这时就需要一个字段名别名转换处理,我有想过用[字段名 AS 别名]的方法不过我觉得好麻烦 也写了好多的代码,后面我无意中看到了MSDN
大家看到现有的大多数ERP系统向用户展示的都是中文的字段名,如果维护过ERP就会发现后台的数据库里面用的都是英文字段名的,这时就需要一个字段名别名转换处理,我有想过用[字段名 AS 别名]的方法不过我觉得好麻烦 也写了好多的代码,后面我无意中看到了MSDN上的文档发现了DataTableMapping
以下代码示例创建一个 DataTableMapping(从 System.Data.Common 命名空间)并通过将其命名为“Table”来使其成为指定 DataAdapter 的默认映射。然后,该示例将查询结果中第一个表(Northwind 数据库的 Customers 表)中的列映射到 DataSet 的 Northwind Customers 表中的一组更为用户友好的名称。对于未映射的列,将使用数据源中的列名称。
这里面的“一组更为用户友好的名称” 这几个字吸引了我的眼球。
1.得到一个表包含:表名,表描述,字段名,字段描述等字段资料
public DataTable GetColumnsInformation(bool IsHeader, params string[] TableNames) { using (SqlConnection sconn = new SqlConnection(ConnectionString.sqlconnection)) { StringBuilder sbTableInner = new StringBuilder(); DataSet ds = new DataSet(); DataTable dt = new DataTable(); if (!IsHeader) { for (int CurrentTable = 0; CurrentTable < TableNames.Length; CurrentTable++) { if (CurrentTable == TableNames.Length - 1) { sbTableInner.Append("@" + TableNames[CurrentTable]); } else { sbTableInner.Append("@" + TableNames[CurrentTable] + ","); } } } else { sbTableInner.Append("@" + TableNames[0]); } SqlCommand scomm = new SqlCommand("SELECT TableName = OBJECT_NAME(c.object_id)," + "TableDecription = (SELECT a.[value] FROM sys.extended_properties a left JOIN sysobjects b ON a.major_id=b.id WHERE b.name=OBJECT_NAME(c.object_id) and a.minor_id=0 )," + "ColumnsName = c.name, Description = ex.value, ColumnType = t.name, " + "Length = c.max_length, strCount = len(OBJECT_NAME(c.object_id)) " + "FROM sys.columns c LEFT OUTER JOIN sys.extended_properties ex " + "ON ex.major_id = c.object_id AND ex.minor_id = c.column_id AND ex.name = 'MS_Description' " + "left outer join systypes t on c.system_type_id = t.xtype WHERE " + "OBJECTPROPERTY(c.object_id, 'IsMsShipped') = 0 " + "AND OBJECT_NAME(c.object_id) in (" + sbTableInner.ToString() + ") " + "order by strCount", sconn); if (!IsHeader) { for (int CurrentTable = 0; CurrentTable < TableNames.Length; CurrentTable++) { scomm.Parameters.AddWithValue("@" + TableNames[CurrentTable], TableNames[CurrentTable]); } } else { scomm.Parameters.AddWithValue("@" + TableNames[0], TableNames[0]); } SqlDataAdapter sda = new SqlDataAdapter(scomm); sda.MissingSchemaAction = MissingSchemaAction.AddWithKey;//添加必须的列和主键信息以完成架构 sda.Fill(ds, "FieldTable"); dt = ds.Tables[0]; dt.Columns.Add("InnerColumns"); dt.Columns.Add("InnerColumnsCN"); for (int CurrentRow = 0; CurrentRow < dt.Rows.Count; CurrentRow++) { dt.Rows[CurrentRow]["InnerColumns"] = dt.Rows[CurrentRow]["TableName"] + "." + dt.Rows[CurrentRow]["ColumnsName"]; dt.Rows[CurrentRow]["InnerColumnsCN"] = dt.Rows[CurrentRow]["TableDecription"] + "-" + dt.Rows[CurrentRow]["Description"]; } return dt; } }2.利用DataTableMapping 实现,向用户显示友好的字段名称
public DataTable Query(string tableName, string where, bool IsAlias = true) { DataTable dtColumns = new DataTable(); dtColumns = bq.ColumnsInformation(false, new string[] { tableName }); using (SqlDataAdapter sda = new SqlDataAdapter("SELECT * FROM " + tableName + " WHERE InnerID LIKE @where ORDER BY RowID", ConnectionString.sqlconnection)) { SqlParameter parm = new SqlParameter("@where", "%" + where + "%"); sda.SelectCommand.Parameters.Add(parm); DataTableMapping mapping = sda.TableMappings.Add(tableName, dtColumns.Rows[0]["TableDecription"].ToString()); for (int CurrentRow = 0; CurrentRow < dtColumns.Rows.Count; CurrentRow++) mapping.ColumnMappings.Add(dtColumns.Rows[CurrentRow]["ColumnsName"].ToString(), dtColumns.Rows[CurrentRow]["Description"].ToString()); DataSet ds = new DataSet(); if (IsAlias) { sda.Fill(ds, mapping.SourceTable); } else { sda.Fill(ds, mapping.DataSetTable); } DataTable dt = new DataTable(); dt = ds.Tables[0]; return dt; } }