C# 将字节[]从C保存到SQL Server数据库中#

如何将字节[]数组保存到SQL Server数据库中？ 此字节[]包含哈希算法值

这些数据需要再次使用。所以转换它，而不是让它回到原来的状态，不是我想要的

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提前谢谢

使用

VARBINARY

您应该能够编写如下内容：

string queryStmt = "INSERT INTO dbo.YourTable(Content) VALUES(@Content)";

using(SqlConnection _con = new SqlConnection(--your-connection-string-here--))
using(SqlCommand _cmd = new SqlCommand(queryStmt, _con))
{
   SqlParameter param = _cmd.Parameters.Add("@Content", SqlDbType.VarBinary);
   param.Value = YourByteArrayVariableHere;

   _con.Open();
   _cmd.ExecuteNonQuery();
   _con.Close();
}

using(YourDataContextHere ctx = new YourDataContextHere())
{
   SomeClassOfYours item = new SomeClassOfYours();

   item.ByteContent = (your byte content here);

   ctx.SomeClassOfYourses.InsertOnSubmit(item);
   ctx.SubmitChanges();
}

using (var con = DapperConnection.Con)
{
    string firstValue = "any text...";
    string secondValue = "HTML code maybe ?";

    // Convert your string into byte array:
    byte[] htmlCode = Encoding.ASCII.GetBytes(secondValue);

    // Define your insert query and execute it:
    con.Execute($@" INSERT INTO [dbo].[YourTableName]
                    ( [firstColumnName], [secondColumnName] )
                    VALUES
                    ( {firstValue}, COMPRESS(@HTML) )", new { HTML = htmlCode });
}

SELECT [firstColumnName], CONVERT(varchar(MAX), DECOMPRESS([secondColumnName])) FROM [YourTableName];

使用Linq to SQL，您可以编写如下内容：

string queryStmt = "INSERT INTO dbo.YourTable(Content) VALUES(@Content)";

using(SqlConnection _con = new SqlConnection(--your-connection-string-here--))
using(SqlCommand _cmd = new SqlCommand(queryStmt, _con))
{
   SqlParameter param = _cmd.Parameters.Add("@Content", SqlDbType.VarBinary);
   param.Value = YourByteArrayVariableHere;

   _con.Open();
   _cmd.ExecuteNonQuery();
   _con.Close();
}

using(YourDataContextHere ctx = new YourDataContextHere())
{
   SomeClassOfYours item = new SomeClassOfYours();

   item.ByteContent = (your byte content here);

   ctx.SomeClassOfYourses.InsertOnSubmit(item);
   ctx.SubmitChanges();
}

using (var con = DapperConnection.Con)
{
    string firstValue = "any text...";
    string secondValue = "HTML code maybe ?";

    // Convert your string into byte array:
    byte[] htmlCode = Encoding.ASCII.GetBytes(secondValue);

    // Define your insert query and execute it:
    con.Execute($@" INSERT INTO [dbo].[YourTableName]
                    ( [firstColumnName], [secondColumnName] )
                    VALUES
                    ( {firstValue}, COMPRESS(@HTML) )", new { HTML = htmlCode });
}

SELECT [firstColumnName], CONVERT(varchar(MAX), DECOMPRESS([secondColumnName])) FROM [YourTableName];

---

这将把您的

byte[]

作为字节流插入SQL Server表中

VARBINARY

类型的

Content

列中，稍后您可以将其以1:1的比例读回。

VARBINARY或CHAR-值转换为十六进制。我经常使用散列值来执行此操作，因为它允许我轻松查看和比较它们（在打印输出时，在开发过程中），并且开销很小。

使用Dapper，您可以像这样轻松保存HTML代码：

string queryStmt = "INSERT INTO dbo.YourTable(Content) VALUES(@Content)";

using(SqlConnection _con = new SqlConnection(--your-connection-string-here--))
using(SqlCommand _cmd = new SqlCommand(queryStmt, _con))
{
   SqlParameter param = _cmd.Parameters.Add("@Content", SqlDbType.VarBinary);
   param.Value = YourByteArrayVariableHere;

   _con.Open();
   _cmd.ExecuteNonQuery();
   _con.Close();
}

using(YourDataContextHere ctx = new YourDataContextHere())
{
   SomeClassOfYours item = new SomeClassOfYours();

   item.ByteContent = (your byte content here);

   ctx.SomeClassOfYourses.InsertOnSubmit(item);
   ctx.SubmitChanges();
}

using (var con = DapperConnection.Con)
{
    string firstValue = "any text...";
    string secondValue = "HTML code maybe ?";

    // Convert your string into byte array:
    byte[] htmlCode = Encoding.ASCII.GetBytes(secondValue);

    // Define your insert query and execute it:
    con.Execute($@" INSERT INTO [dbo].[YourTableName]
                    ( [firstColumnName], [secondColumnName] )
                    VALUES
                    ( {firstValue}, COMPRESS(@HTML) )", new { HTML = htmlCode });
}

SELECT [firstColumnName], CONVERT(varchar(MAX), DECOMPRESS([secondColumnName])) FROM [YourTableName];

然后，您可以像这样从数据库中解压缩它：

string queryStmt = "INSERT INTO dbo.YourTable(Content) VALUES(@Content)";

using(SqlConnection _con = new SqlConnection(--your-connection-string-here--))
using(SqlCommand _cmd = new SqlCommand(queryStmt, _con))
{
   SqlParameter param = _cmd.Parameters.Add("@Content", SqlDbType.VarBinary);
   param.Value = YourByteArrayVariableHere;

   _con.Open();
   _cmd.ExecuteNonQuery();
   _con.Close();
}

using(YourDataContextHere ctx = new YourDataContextHere())
{
   SomeClassOfYours item = new SomeClassOfYours();

   item.ByteContent = (your byte content here);

   ctx.SomeClassOfYourses.InsertOnSubmit(item);
   ctx.SubmitChanges();
}

using (var con = DapperConnection.Con)
{
    string firstValue = "any text...";
    string secondValue = "HTML code maybe ?";

    // Convert your string into byte array:
    byte[] htmlCode = Encoding.ASCII.GetBytes(secondValue);

    // Define your insert query and execute it:
    con.Execute($@" INSERT INTO [dbo].[YourTableName]
                    ( [firstColumnName], [secondColumnName] )
                    VALUES
                    ( {firstValue}, COMPRESS(@HTML) )", new { HTML = htmlCode });
}

SELECT [firstColumnName], CONVERT(varchar(MAX), DECOMPRESS([secondColumnName])) FROM [YourTableName];

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回答得好。但是，根据该值是散列的语句，它可能具有恒定的长度。如果是这样的话，考虑使用二进制长度，而不是ValBoo.@ Sean Reilly：Trime-但是不同的哈希算法也会产生不同的长度哈希值，所以您可能希望使用具有合适的最大长度的ValBoin来容纳所有的哈希值。variations@marc_s我将使用linq。我必须做SqlDbType.VarBinary吗？@Yustme:更新了我的答案，将Linq也包括到了SQL中。是的，无论您以何种方式访问SQL Server表，都需要一个VARBINARY列。在Linq to SQL中，它将在实体类中显示为一个“二进制”列，您可以像设置（并读取）任何其他列一样设置它。@marc_也是如此-但是很可能所有行都是相同的哈希算法。如果（且仅当）是这样，我会坚持我的建议，使用定长二进制而不是varbinary。压缩和解压缩是SQL特性还是简洁的特性？蒂尔：不管怎样，这都很酷。