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
如果你要转换命令文本:
Private Function ConvToNonParm(ByRef Cmd As SqlClient.SqlCommand) As String
For myCnt As Int16 = 1 To Cmd.Parameters.Count
Dim myVal As String = Cmd.Parameters(myCnt - 1).Value
Select Case Cmd.Parameters(myCnt - 1).SqlDbType
Case SqlDbType.Char, SqlDbType.NChar, SqlDbType.VarChar, SqlDbType.NChar, SqlDbType.NVarChar 'and so on
myVal = "'" & myVal & "'"
'Case "others...."
Case Else
'please assing
End Select
Cmd.CommandText = Replace(Cmd.CommandText, Cmd.Parameters(myCnt - 1).ToString, myVal)
Next
Cmd.Parameters.Clear()
Return Cmd.CommandText
End Function
现在你可以像下面这样获得非参数commandtext:
myCmd.CommandText = "UPDATE someTable SET Value = @Value"
myCmd.CommandText &= " WHERE Id = @Id"
myCmd.Parameters.AddWithValue("@Id", 1234)
myCmd.Parameters.AddWithValue("@Value", "myValue")
myCmd.CommandText = ConvToNonParm(myCmd)
结果是“更新someTable SET值= 'myValue' WHERE Id = 1234”，不再带参数
其他回答
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());
}
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。
如果你要转换命令文本:
Private Function ConvToNonParm(ByRef Cmd As SqlClient.SqlCommand) As String
For myCnt As Int16 = 1 To Cmd.Parameters.Count
Dim myVal As String = Cmd.Parameters(myCnt - 1).Value
Select Case Cmd.Parameters(myCnt - 1).SqlDbType
Case SqlDbType.Char, SqlDbType.NChar, SqlDbType.VarChar, SqlDbType.NChar, SqlDbType.NVarChar 'and so on
myVal = "'" & myVal & "'"
'Case "others...."
Case Else
'please assing
End Select
Cmd.CommandText = Replace(Cmd.CommandText, Cmd.Parameters(myCnt - 1).ToString, myVal)
Next
Cmd.Parameters.Clear()
Return Cmd.CommandText
End Function
现在你可以像下面这样获得非参数commandtext:
myCmd.CommandText = "UPDATE someTable SET Value = @Value"
myCmd.CommandText &= " WHERE Id = @Id"
myCmd.Parameters.AddWithValue("@Id", 1234)
myCmd.Parameters.AddWithValue("@Value", "myValue")
myCmd.CommandText = ConvToNonParm(myCmd)
结果是“更新someTable SET值= 'myValue' WHERE Id = 1234”，不再带参数
虽然不完美，这里有一些我为TSQL做的东西-可以很容易地调整为其他口味…如果没有其他的话，它将为你自己的改进提供一个起点:)
这在数据类型和输出参数等方面做得很好，类似于在SSMS中使用“执行存储过程”。我们主要使用sp，所以“text”命令不考虑参数等
public static String ParameterValueForSQL(this SqlParameter sp)
{
String retval = "";
switch (sp.SqlDbType)
{
case SqlDbType.Char:
case SqlDbType.NChar:
case SqlDbType.NText:
case SqlDbType.NVarChar:
case SqlDbType.Text:
case SqlDbType.Time:
case SqlDbType.VarChar:
case SqlDbType.Xml:
case SqlDbType.Date:
case SqlDbType.DateTime:
case SqlDbType.DateTime2:
case SqlDbType.DateTimeOffset:
retval = "'" + sp.Value.ToString().Replace("'", "''") + "'";
break;
case SqlDbType.Bit:
retval = (sp.Value.ToBooleanOrDefault(false)) ? "1" : "0";
break;
default:
retval = sp.Value.ToString().Replace("'", "''");
break;
}
return retval;
}
public static String CommandAsSql(this SqlCommand sc)
{
StringBuilder sql = new StringBuilder();
Boolean FirstParam = true;
sql.AppendLine("use " + sc.Connection.Database + ";");
switch (sc.CommandType)
{
case CommandType.StoredProcedure:
sql.AppendLine("declare @return_value int;");
foreach (SqlParameter sp in sc.Parameters)
{
if ((sp.Direction == ParameterDirection.InputOutput) || (sp.Direction == ParameterDirection.Output))
{
sql.Append("declare " + sp.ParameterName + "\t" + sp.SqlDbType.ToString() + "\t= ");
sql.AppendLine(((sp.Direction == ParameterDirection.Output) ? "null" : sp.ParameterValueForSQL()) + ";");
}
}
sql.AppendLine("exec [" + sc.CommandText + "]");
foreach (SqlParameter sp in sc.Parameters)
{
if (sp.Direction != ParameterDirection.ReturnValue)
{
sql.Append((FirstParam) ? "\t" : "\t, ");
if (FirstParam) FirstParam = false;
if (sp.Direction == ParameterDirection.Input)
sql.AppendLine(sp.ParameterName + " = " + sp.ParameterValueForSQL());
else
sql.AppendLine(sp.ParameterName + " = " + sp.ParameterName + " output");
}
}
sql.AppendLine(";");
sql.AppendLine("select 'Return Value' = convert(varchar, @return_value);");
foreach (SqlParameter sp in sc.Parameters)
{
if ((sp.Direction == ParameterDirection.InputOutput) || (sp.Direction == ParameterDirection.Output))
{
sql.AppendLine("select '" + sp.ParameterName + "' = convert(varchar, " + sp.ParameterName + ");");
}
}
break;
case CommandType.Text:
sql.AppendLine(sc.CommandText);
break;
}
return sql.ToString();
}
这将产生沿着这些线的输出…
use dbMyDatabase;
declare @return_value int;
declare @OutTotalRows BigInt = null;
exec [spMyStoredProc]
@InEmployeeID = 1000686
, @InPageSize = 20
, @InPage = 1
, @OutTotalRows = @OutTotalRows output
;
select 'Return Value' = convert(varchar, @return_value);
select '@OutTotalRows' = convert(varchar, @OutTotalRows);
这个方法是我自己写的。我用了布鲁诺·拉尼克的代码。也许它对某人有用。
public static string getQueryFromCommand(SqlCommand cmd)
{
StringBuilder CommandTxt = new StringBuilder();
CommandTxt.Append("DECLARE ");
List<string> paramlst = new List<string>();
foreach (SqlParameter parms in cmd.Parameters)
{
paramlst.Add(parms.ParameterName);
CommandTxt.Append(parms.ParameterName + " AS ");
CommandTxt.Append(parms.SqlDbType.ToString());
CommandTxt.Append(",");
}
if (CommandTxt.ToString().Substring(CommandTxt.Length-1, 1) == ",")
CommandTxt.Remove(CommandTxt.Length-1, 1);
CommandTxt.AppendLine();
int rownr = 0;
foreach (SqlParameter parms in cmd.Parameters)
{
string val = String.Empty;
if (parms.DbType.Equals(DbType.String) || parms.DbType.Equals(DbType.DateTime))
val = "'" + Convert.ToString(parms.Value).Replace(@"\", @"\\").Replace("'", @"\'") + "'";
if (parms.DbType.Equals(DbType.Int16) || parms.DbType.Equals(DbType.Int32) || parms.DbType.Equals(DbType.Int64) || parms.DbType.Equals(DbType.Decimal) || parms.DbType.Equals(DbType.Double))
val = Convert.ToString(parms.Value);
CommandTxt.AppendLine();
CommandTxt.Append("SET " + paramlst[rownr].ToString() + " = " + val.ToString());
rownr += 1;
}
CommandTxt.AppendLine();
CommandTxt.AppendLine();
CommandTxt.Append(cmd.CommandText);
return CommandTxt.ToString();
}
