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。
其他回答
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
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。
为我的解决方案使用了Flapper的部分代码，它返回整个SQL字符串，包括在MS SQL SMS中运行的参数值。
public string ParameterValueForSQL(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:
if (sp.Value == DBNull.Value)
{
retval = "NULL";
}
else
{
retval = "'" + sp.Value.ToString().Replace("'", "''") + "'";
}
break;
case SqlDbType.Bit:
if (sp.Value == DBNull.Value)
{
retval = "NULL";
}
else
{
retval = ((bool)sp.Value == false) ? "0" : "1";
}
break;
default:
if (sp.Value == DBNull.Value)
{
retval = "NULL";
}
else
{
retval = sp.Value.ToString().Replace("'", "''");
}
break;
}
return retval;
}
public string CommandAsSql(SqlCommand sc)
{
string sql = sc.CommandText;
sql = sql.Replace("\r\n", "").Replace("\r", "").Replace("\n", "");
sql = System.Text.RegularExpressions.Regex.Replace(sql, @"\s+", " ");
foreach (SqlParameter sp in sc.Parameters)
{
string spName = sp.ParameterName;
string spValue = ParameterValueForSQL(sp);
sql = sql.Replace(spName, spValue);
}
sql = sql.Replace("= NULL", "IS NULL");
sql = sql.Replace("!= NULL", "IS NOT NULL");
return sql;
}
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#。
//For Oracle db in the sql text the parameters could be like :ID,:NAME etc.
//This is same as above Seyed Hossein Mirheydari, but slightly improved,
//this works with parameter names well.
//Further is straight simple one, you need to format for datatypes
//after query is generated.
private string GetFullOraQuery(OracleCommand cmd)
{
string query = cmd.CommandText;
foreach (OracleParameter p in cmd.Parameters)
{
query = query.Replace(":" + p.ParameterName, ((p.Value == null) ? "" : p.Value.ToString()));
}
return query;
}
