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
如果你正在使用SQL Server，你可以使用SQL Server Profiler(如果你有的话)来查看实际执行的命令字符串。这对于复制/粘贴测试很有用，但对于日志记录恐怕就没用了。
修改版本的Kon的答案，因为它只是部分工作与类似的命名参数。使用String Replace函数的缺点。除此之外，我完全信任他的解决方案。
private string GetActualQuery(SqlCommand sqlcmd)
{
string query = sqlcmd.CommandText;
string parameters = "";
string[] strArray = System.Text.RegularExpressions.Regex.Split(query, " VALUES ");
//Reconstructs the second half of the SQL Command
parameters = "(";
int count = 0;
foreach (SqlParameter p in sqlcmd.Parameters)
{
if (count == (sqlcmd.Parameters.Count - 1))
{
parameters += p.Value.ToString();
}
else
{
parameters += p.Value.ToString() + ", ";
}
count++;
}
parameters += ")";
//Returns the string recombined.
return strArray[0] + " VALUES " + parameters;
}
如果只是检查结果查询中的参数是如何格式化的，大多数DBMS将允许从无开始查询字面量。因此:
Using cmd As SqlCommand = Connection.CreateCommand
cmd.CommandText = "SELECT @Value"
cmd.Parameters.AddWithValue("@Value", "myValue")
Return cmd.ExecuteScalar
End Using
这样你就可以看到引号是否被加倍等等。
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
扩展Kon的代码来帮助调试存储过程:
private void ExtractSqlCommandForDebugging(SqlCommand cmd)
{
string sql = "exec " + cmd.CommandText;
bool first = true;
foreach (SqlParameter p in cmd.Parameters)
{
string value = ((p.Value == DBNull.Value) ? "null"
: (p.Value is string) ? "'" + p.Value + "'"
: p.Value.ToString());
if (first)
{
sql += string.Format(" {0}={1}", p.ParameterName, value);
first = false;
}
else
{
sql += string.Format("\n , {0}={1}", p.ParameterName, value);
}
}
sql += "\nGO";
Debug.WriteLine(sql);
}
在我的第一个测试用例中，它生成:
exec dbo.MyStoredProcName @SnailMail=False
, @Email=True
, @AcceptSnailMail=False
, @AcceptEmail=False
, @DistanceMiles=-1
, @DistanceLocationList=''
, @ExcludeDissatisfied=True
, @ExcludeCodeRed=True
, @MinAge=null
, @MaxAge=18
, @GenderTypeID=-1
, @NewThisYear=-1
, @RegisteredThisYear=-1
, @FormersTermGroupList=''
, @RegistrationStartDate=null
, @RegistrationEndDate=null
, @DivisionList='25'
, @LocationList='29,30'
, @OneOnOneOPL=-1
, @JumpStart=-1
, @SmallGroup=-1
, @PurchasedEAP=-1
, @RedeemedEAP=-1
, @ReturnPlanYes=False
, @MinNetPromoter=-1
, @MinSurveyScore=-1
, @VIPExclusionTypes='-2'
, @FieldSelectionMask=65011584
, @DisplayType=0
GO
你可能需要添加一些有条件的“..is…”类型的赋值，例如日期和时间。
