我有以下代码:
Using cmd As SqlCommand = Connection.CreateCommand
cmd.CommandText = "UPDATE someTable SET Value = @Value"
cmd.CommandText &= " WHERE Id = @Id"
cmd.Parameters.AddWithValue("@Id", 1234)
cmd.Parameters.AddWithValue("@Value", "myValue")
cmd.ExecuteNonQuery
End Using
我想知道是否有任何方法来获得最终的SQL语句作为字符串，它应该看起来像这样:
UPDATE someTable SET Value = "myValue" WHERE Id = 1234
如果有人想知道我为什么要这么做
用于记录(失败的)语句 可以将其复制粘贴到企业管理器中进行测试
当前回答
这个方法现在对我很有效。也许它对某人有用。请原谅所有的冗余。
Public Shared Function SqlString(ByVal cmd As SqlCommand) As String
Dim sbRetVal As New System.Text.StringBuilder()
For Each item As SqlParameter In cmd.Parameters
Select Case item.DbType
Case DbType.String
sbRetVal.AppendFormat("DECLARE {0} AS VARCHAR(255)", item.ParameterName)
sbRetVal.AppendLine()
sbRetVal.AppendFormat("SET {0} = '{1}'", item.ParameterName, item.Value)
sbRetVal.AppendLine()
Case DbType.DateTime
sbRetVal.AppendFormat("DECLARE {0} AS DATETIME", item.ParameterName)
sbRetVal.AppendLine()
sbRetVal.AppendFormat("SET {0} = '{1}'", item.ParameterName, item.Value)
sbRetVal.AppendLine()
Case DbType.Guid
sbRetVal.AppendFormat("DECLARE {0} AS UNIQUEIDENTIFIER", item.ParameterName)
sbRetVal.AppendLine()
sbRetVal.AppendFormat("SET {0} = '{1}'", item.ParameterName, item.Value)
sbRetVal.AppendLine()
Case DbType.Int32
sbRetVal.AppendFormat("DECLARE {0} AS int", item.ParameterName)
sbRetVal.AppendLine()
sbRetVal.AppendFormat("SET {0} = {1}", item.ParameterName, item.Value)
sbRetVal.AppendLine()
Case Else
Stop
End Select
Next
sbRetVal.AppendLine("")
sbRetVal.AppendLine(cmd.CommandText)
Return sbRetVal.ToString()
End Function
其他回答
我也有同样的问题，在阅读了这些回复后，我错误地认为不可能得到准确的结果查询。我错了。
解决方案: 在SQL Server Management Studio中打开活动监视器，将进程部分缩小为应用程序在连接字符串中使用的登录用户名、数据库或应用程序名称。当调用db刷新活动监视器时。当您看到流程时，右键单击它并查看详细信息。
注意，对于繁忙的db来说，这可能不是一个可行的选项。但是您应该能够使用这些步骤大大缩小结果。
我需要一个类似于字符串转换器的命令来允许更详细的日志记录，所以我写了这个命令。它将生成在新会话中重新执行命令所需的文本，包括输出参数和结构化参数。它经过了轻微的检验，但买者自负。
例子:
SqlCommand cmd = new SqlCommand("GetEntity", con);
cmd.Parameters.AddWithValue("@foobar", 1);
cmd.Parameters.Add(new SqlParameter(){
ParameterName = "@outParam",
Direction = ParameterDirection.Output,
SqlDbType = System.Data.SqlDbType.Int
});
cmd.Parameters.Add(new SqlParameter(){
Direction = ParameterDirection.ReturnValue
});
cmd.CommandType = CommandType.StoredProcedure;
会产生:
-- BEGIN COMMAND
DECLARE @foobar INT = 1;
DECLARE @outParam INT = NULL;
DECLARE @returnValue INT;
-- END PARAMS
EXEC @returnValue = GetEntity @foobar = @foobar, @outParam = @outParam OUTPUT
-- RESULTS
SELECT 1 as Executed, @returnValue as ReturnValue, @outParam as [@outParam];
-- END COMMAND
实现:
public class SqlCommandDumper
{
public static string GetCommandText(SqlCommand sqc)
{
StringBuilder sbCommandText = new StringBuilder();
sbCommandText.AppendLine("-- BEGIN COMMAND");
// params
for (int i = 0; i < sqc.Parameters.Count; i++)
logParameterToSqlBatch(sqc.Parameters[i], sbCommandText);
sbCommandText.AppendLine("-- END PARAMS");
// command
if (sqc.CommandType == CommandType.StoredProcedure)
{
sbCommandText.Append("EXEC ");
bool hasReturnValue = false;
for (int i = 0; i < sqc.Parameters.Count; i++)
{
if (sqc.Parameters[i].Direction == ParameterDirection.ReturnValue)
hasReturnValue = true;
}
if (hasReturnValue)
{
sbCommandText.Append("@returnValue = ");
}
sbCommandText.Append(sqc.CommandText);
bool hasPrev = false;
for (int i = 0; i < sqc.Parameters.Count; i++)
{
var cParam = sqc.Parameters[i];
if (cParam.Direction != ParameterDirection.ReturnValue)
{
if (hasPrev)
sbCommandText.Append(",");
sbCommandText.Append(" ");
sbCommandText.Append(cParam.ParameterName);
sbCommandText.Append(" = ");
sbCommandText.Append(cParam.ParameterName);
if (cParam.Direction.HasFlag(ParameterDirection.Output))
sbCommandText.Append(" OUTPUT");
hasPrev = true;
}
}
}
else
{
sbCommandText.AppendLine(sqc.CommandText);
}
sbCommandText.AppendLine("-- RESULTS");
sbCommandText.Append("SELECT 1 as Executed");
for (int i = 0; i < sqc.Parameters.Count; i++)
{
var cParam = sqc.Parameters[i];
if (cParam.Direction == ParameterDirection.ReturnValue)
{
sbCommandText.Append(", @returnValue as ReturnValue");
}
else if (cParam.Direction.HasFlag(ParameterDirection.Output))
{
sbCommandText.Append(", ");
sbCommandText.Append(cParam.ParameterName);
sbCommandText.Append(" as [");
sbCommandText.Append(cParam.ParameterName);
sbCommandText.Append(']');
}
}
sbCommandText.AppendLine(";");
sbCommandText.AppendLine("-- END COMMAND");
return sbCommandText.ToString();
}
private static void logParameterToSqlBatch(SqlParameter param, StringBuilder sbCommandText)
{
sbCommandText.Append("DECLARE ");
if (param.Direction == ParameterDirection.ReturnValue)
{
sbCommandText.AppendLine("@returnValue INT;");
}
else
{
sbCommandText.Append(param.ParameterName);
sbCommandText.Append(' ');
if (param.SqlDbType != SqlDbType.Structured)
{
logParameterType(param, sbCommandText);
sbCommandText.Append(" = ");
logQuotedParameterValue(param.Value, sbCommandText);
sbCommandText.AppendLine(";");
}
else
{
logStructuredParameter(param, sbCommandText);
}
}
}
private static void logStructuredParameter(SqlParameter param, StringBuilder sbCommandText)
{
sbCommandText.AppendLine(" {List Type};");
var dataTable = (DataTable)param.Value;
for (int rowNo = 0; rowNo < dataTable.Rows.Count; rowNo++)
{
sbCommandText.Append("INSERT INTO ");
sbCommandText.Append(param.ParameterName);
sbCommandText.Append(" VALUES (");
bool hasPrev = false;
for (int colNo = 0; colNo < dataTable.Columns.Count; colNo++)
{
if (hasPrev)
{
sbCommandText.Append(", ");
}
logQuotedParameterValue(dataTable.Rows[rowNo].ItemArray[colNo], sbCommandText);
hasPrev = true;
}
sbCommandText.AppendLine(");");
}
}
const string DATETIME_FORMAT_ROUNDTRIP = "o";
private static void logQuotedParameterValue(object value, StringBuilder sbCommandText)
{
try
{
if (value == null)
{
sbCommandText.Append("NULL");
}
else
{
value = unboxNullable(value);
if (value is string
|| value is char
|| value is char[]
|| value is System.Xml.Linq.XElement
|| value is System.Xml.Linq.XDocument)
{
sbCommandText.Append("N'");
sbCommandText.Append(value.ToString().Replace("'", "''"));
sbCommandText.Append('\'');
}
else if (value is bool)
{
// True -> 1, False -> 0
sbCommandText.Append(Convert.ToInt32(value));
}
else if (value is sbyte
|| value is byte
|| value is short
|| value is ushort
|| value is int
|| value is uint
|| value is long
|| value is ulong
|| value is float
|| value is double
|| value is decimal)
{
sbCommandText.Append(value.ToString());
}
else if (value is DateTime)
{
// SQL Server only supports ISO8601 with 3 digit precision on datetime,
// datetime2 (>= SQL Server 2008) parses the .net format, and will
// implicitly cast down to datetime.
// Alternatively, use the format string "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffK"
// to match SQL server parsing
sbCommandText.Append("CAST('");
sbCommandText.Append(((DateTime)value).ToString(DATETIME_FORMAT_ROUNDTRIP));
sbCommandText.Append("' as datetime2)");
}
else if (value is DateTimeOffset)
{
sbCommandText.Append('\'');
sbCommandText.Append(((DateTimeOffset)value).ToString(DATETIME_FORMAT_ROUNDTRIP));
sbCommandText.Append('\'');
}
else if (value is Guid)
{
sbCommandText.Append('\'');
sbCommandText.Append(((Guid)value).ToString());
sbCommandText.Append('\'');
}
else if (value is byte[])
{
var data = (byte[])value;
if (data.Length == 0)
{
sbCommandText.Append("NULL");
}
else
{
sbCommandText.Append("0x");
for (int i = 0; i < data.Length; i++)
{
sbCommandText.Append(data[i].ToString("x"));
}
}
}
else
{
sbCommandText.Append("/* UNKNOWN DATATYPE: ");
sbCommandText.Append(value.GetType().ToString());
sbCommandText.Append(" *" + "/ N'");
sbCommandText.Append(value.ToString());
sbCommandText.Append('\'');
}
}
}
catch (Exception ex)
{
sbCommandText.AppendLine("/* Exception occurred while converting parameter: ");
sbCommandText.AppendLine(ex.ToString());
sbCommandText.AppendLine("*/");
}
}
private static object unboxNullable(object value)
{
var typeOriginal = value.GetType();
if (typeOriginal.IsGenericType
&& typeOriginal.GetGenericTypeDefinition() == typeof(Nullable<>))
{
// generic value, unboxing needed
return typeOriginal.InvokeMember("GetValueOrDefault",
System.Reflection.BindingFlags.Public |
System.Reflection.BindingFlags.Instance |
System.Reflection.BindingFlags.InvokeMethod,
null, value, null);
}
else
{
return value;
}
}
private static void logParameterType(SqlParameter param, StringBuilder sbCommandText)
{
switch (param.SqlDbType)
{
// variable length
case SqlDbType.Char:
case SqlDbType.NChar:
case SqlDbType.Binary:
{
sbCommandText.Append(param.SqlDbType.ToString().ToUpper());
sbCommandText.Append('(');
sbCommandText.Append(param.Size);
sbCommandText.Append(')');
}
break;
case SqlDbType.VarBinary:
case SqlDbType.Image:
{
sbCommandText.Append("VARBINARY");
sbCommandText.Append("(MAX /* Specified as ");
sbCommandText.Append(param.Size);
sbCommandText.Append(" */)");
}
break;
case SqlDbType.VarChar:
case SqlDbType.Text:
{
sbCommandText.Append("VARCHAR");
sbCommandText.Append("(MAX /* Specified as ");
sbCommandText.Append(param.Size);
sbCommandText.Append(" */)");
}
break;
case SqlDbType.NVarChar:
case SqlDbType.NText:
{
sbCommandText.Append("NVARCHAR");
sbCommandText.Append("(MAX /* Specified as ");
sbCommandText.Append(param.Size);
sbCommandText.Append(" */)");
}
break;
// fixed length
case SqlDbType.Bit:
case SqlDbType.TinyInt:
case SqlDbType.SmallInt:
case SqlDbType.Int:
case SqlDbType.BigInt:
case SqlDbType.SmallMoney:
case SqlDbType.Money:
case SqlDbType.Decimal:
case SqlDbType.Real:
case SqlDbType.Float:
case SqlDbType.Date:
case SqlDbType.DateTime:
case SqlDbType.DateTime2:
case SqlDbType.DateTimeOffset:
case SqlDbType.UniqueIdentifier:
{
sbCommandText.Append(param.SqlDbType.ToString().ToUpper());
}
break;
// Unknown
case SqlDbType.Timestamp:
default:
{
sbCommandText.Append("/* UNKNOWN DATATYPE: ");
sbCommandText.Append(param.SqlDbType.ToString().ToUpper());
sbCommandText.Append(" *" + "/ ");
sbCommandText.Append(param.SqlDbType.ToString().ToUpper());
}
break;
}
}
}
这是我用来将存储过程的参数列表输出到调试控制台的:
string query = (from SqlParameter p in sqlCmd.Parameters where p != null where p.Value != null select string.Format("Param: {0} = {1}, ", p.ParameterName, p.Value.ToString())).Aggregate(sqlCmd.CommandText, (current, parameter) => current + parameter);
Debug.WriteLine(query);
这将生成一个类似于下面的控制台输出:
Customer.prGetCustomerDetails: @Offset = 1, Param: @Fetch = 10, Param: @CategoryLevel1ID = 3, Param: @VehicleLineID = 9, Param: @SalesCode1 = bce,
我把这段代码直接放在我希望调试的任何过程的下面，它类似于sql分析器会话，但使用c#。
我也有这个问题，一些参数化查询或sp的会给我一个SqlException(主要是字符串或二进制数据将被截断)，并且语句很难调试(据我所知，目前没有SQL分析器支持SQL Azure)
我在这里看到了很多类似的代码。我最终把我的解决方案放在一个Sql-Library项目中，以备将来使用。
生成器可以在这里使用: https://github.com/jeroenpot/SqlHelper/blob/master/Source/Mirabeau.MsSql.Library/SqlGenerator.cs
它支持两种CommandType。文本和命令类型。StoredProcedure
如果你安装了nuget-package，你可以用下面的语句生成它:
SqlDebugHelper.CreateExecutableSqlStatement(sql, parameters);
为了记录日志，恐怕没有更好的方法了，只能自己构造字符串:
string query = cmd.CommandText;
foreach (SqlParameter p in cmd.Parameters)
{
query = query.Replace(p.ParameterName, p.Value.ToString());
}
