从 SQL Server 获取列名 [英] Get column name from SQL Server

问题描述

我正在尝试获取存储在 SQL Server 2008 R2 中的表的列名.

I'm trying to get the column names of a table I have stored in SQL Server 2008 R2.

我确实尝试了所有方法，但我似乎无法找到如何做到这一点.

I've literally tried everything but I can't seem to find how to do this.

现在这是我的 C# 代码

Right now this is my code in C#

public string[] getColumnsName()
{
        List<string> listacolumnas=new List<string>();

        using (SqlConnection connection = new SqlConnection(Connection))
        using (SqlCommand command = connection.CreateCommand())
        {
            command.CommandText = "SELECT TOP 0 * FROM Usuarios";
            connection.Open();

            using (var reader = command.ExecuteReader(CommandBehavior.KeyInfo))
            {
                reader.Read();

                var table = reader.GetSchemaTable();

                foreach (DataColumn column in table.Columns)
                {
                    listacolumnas.Add(column.ColumnName);
                }
            }
        }
        return listacolumnas.ToArray();
    }

但这给我带来了以下内容

But this is returning me the following

<string>ColumnName</string>
<string>ColumnOrdinal</string>
<string>ColumnSize</string>
<string>NumericPrecision</string>
<string>NumericScale</string>
<string>IsUnique</string>
<string>IsKey</string>
<string>BaseServerName</string>
<string>BaseCatalogName</string>
<string>BaseColumnName</string>
<string>BaseSchemaName</string>
<string>BaseTableName</string>
<string>DataType</string>
<string>AllowDBNull</string>
<string>ProviderType</string>
<string>IsAliased</string>
<string>IsExpression</string>
<string>IsIdentity</string>
<string>IsAutoIncrement</string>
<string>IsRowVersion</string>
<string>IsHidden</string>
<string>IsLong</string>
<string>IsReadOnly</string>
<string>ProviderSpecificDataType</string>
<string>DataTypeName</string>
<string>XmlSchemaCollectionDatabase</string>
<string>XmlSchemaCollectionOwningSchema</string>
<string>XmlSchemaCollectionName</string>
<string>UdtAssemblyQualifiedName</string>
<string>NonVersionedProviderType</string>
<string>IsColumnSet</string>

有什么想法吗?

它显示了 标签，因为这是我的网络服务发送数据的方式.

It shows the <string> tags as this is how my web service sends the data.

推荐答案

您可以使用下面的查询来获取表的列名.下面的查询获取给定名称的用户表的所有列:

You can use the query below to get the column names for your table. The query below gets all the columns for a user table of a given name:

select c.name from sys.columns c
inner join sys.tables t 
on t.object_id = c.object_id
and t.name = 'Usuarios' and t.type = 'U'

<小时>

在您的代码中，它看起来像这样:

---

In your code, it will look like that:

public string[] getColumnsName()
{
    List<string> listacolumnas=new List<string>();
    using (SqlConnection connection = new SqlConnection(Connection))
        using (SqlCommand command = connection.CreateCommand())
        {
            command.CommandText = "select c.name from sys.columns c inner join sys.tables t on t.object_id = c.object_id and t.name = 'Usuarios' and t.type = 'U'";
            connection.Open();
            using (var reader = command.ExecuteReader())
            {
                while (reader.Read())
                {
                    listacolumnas.Add(reader.GetString(0));
                }
            }
        }
    return listacolumnas.ToArray();
}

这篇关于从 SQL Server 获取列名的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！