Question

假设我有一个带有列c1的表t1。当我从t1＆＃39;执行＆＃39;选择c1时，我可以使用DataTable / DataRow / DataColumn使用下面的代码片段获取结果的元数据

namespace ConsoleApplication1
{
    internal class Program
    {
        private static void Main(string[] args)
        {

            SqlDataAdapter adapter;
            DataSet dataset = new DataSet();
            using (SqlConnection connection
                = new SqlConnection(@"Persist Security Info=False;Trusted_Connection=True;"))
            {

                SqlCommand command = new SqlCommand(
                    @"SELECT c1 from t1 where 1 = 0;", connection);
                connection.Open();

                SqlDataReader reader = command.ExecuteReader();
                DataTable schemaTable = reader.GetSchemaTable();
                Console.WriteLine(reader.GetName(0)); //Name of column
                foreach (DataRow row in schemaTable.Rows)
                {
                    //Console.WriteLine(row["TableName"]);
                    foreach (DataColumn column in schemaTable.Columns)
                    {
                        Console.WriteLine(String.Format("{0} = {1}",
                            column.ColumnName, row[column]));

                    }
                }


            }
        }
    }
}

但是为BaseTableName返回的值是空白的。有没有其他方法可以获得表格＆＃39; t1＆＃39;与列＆＃39; c1＆＃39;？

相关联

以下是上述代码的输出：

ColumnName = c1
ColumnOrdinal = 0
ColumnSize = 100
NumericPrecision = 255
NumericScale = 255
IsUnique = False
IsKey = 
BaseServerName = 
BaseCatalogName = 
BaseColumnName = c1
BaseSchemaName = 
BaseTableName = 
DataType = System.String
AllowDBNull = True
ProviderType = 3
IsAliased = 
IsExpression = 
IsIdentity = False
IsAutoIncrement = False
IsRowVersion = False
IsHidden = 
IsLong = False
IsReadOnly = False
ProviderSpecificDataType = System.Data.SqlTypes.SqlString
DataTypeName = char
XmlSchemaCollectionDatabase = 
XmlSchemaCollectionOwningSchema = 
XmlSchemaCollectionName = 
UdtAssemblyQualifiedName = 
NonVersionedProviderType = 3
IsColumnSet = False

Answer 1

您可以使用

获取表名

schemaTable.TableName

以下链接将为您提供所需的信息：

https://msdn.microsoft.com/en-us/library/system.data.datatable.tablename(v=vs.110).aspx

https://msdn.microsoft.com/en-us/library/system.data.datarow.table(v=vs.110).aspx

Answer 2

尝试以下操作以获取所有表/列信息

Select * From INFORMATION_SCHEMA.COLUMNS

Answer 3

你几乎得到了它：

//Console.WriteLine(row["table_name"]);

尝试将其更改为：

Console.WriteLine(row["TableName"]);

使用ADO.Net，如何获取与DataColumn关联的数据库表名？

3 个答案: