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。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。它经过了轻微的测试，但需要注意的是。
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;
将产生：
-- 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
实施：
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;
}
}
}