// <summary>
// Constructs a SqlCeParameter
// </summary>
internal static DbParameter CreateSqlCeParameter(
string name, TypeUsage type, object value, bool ignoreMaxLengthFacet, bool isLocalProvider)
{
var rdpSqlCeParameter = Type.GetType(RemoteProvider.SqlCeParameter);
// No other parameter type is supported.
//
DebugCheck.NotNull(type);
int? size;
byte?precision;
byte?scale;
var result = isLocalProvider
? new SqlCeParameter()
: (DbParameter)RemoteProviderHelper.CreateRemoteProviderType(RemoteProvider.SqlCeParameter);
result.ParameterName = name;
result.Value = value;
// .Direction
// parameter.Direction - take the default. we don't support output parameters.
result.Direction = ParameterDirection.Input;
// .Size, .Precision, .Scale and .SqlDbType
var sqlDbType = GetSqlDbType(type, out size, out precision, out scale);
// Skip guessing the parameter type (only for strings & blobs) if parameter size is not available
// Instead, let QP take proper guess at execution time with available details.
//
if ((null != size) ||
(!TypeSemantics.IsPrimitiveType(type, PrimitiveTypeKind.String) &&
!TypeSemantics.IsPrimitiveType(type, PrimitiveTypeKind.Binary)))
{
if (isLocalProvider)
{
var sqlCeParameter = (SqlCeParameter)result;
if (sqlCeParameter.SqlDbType != sqlDbType)
{
sqlCeParameter.SqlDbType = sqlDbType;
}
}
else
{
// Remote Provider is loaded by reflection. As SqlDbType is not part of the base interface
// We need to access this using reflection only.
var rdpType = RemoteProviderHelper.GetRemoteProviderType(RemoteProvider.SqlCeParameter);
var rdpInfo = rdpType.GetProperty("SqlDbType");
rdpInfo.SetValue(result, sqlDbType, null);
}
}
// Note that we overwrite 'facet' parameters where either the value is different or
// there is an output parameter. This is because output parameters in SqlClient have their
// facets clobbered if they are implicitly set (e.g. if the Precision was implicitly set
// by setting the value)
if (!ignoreMaxLengthFacet &&
size.HasValue &&
(result.Size != size.Value))
{
result.Size = size.Value;
}
if (precision.HasValue &&
(((IDbDataParameter)result).Precision != precision.Value))
{
((IDbDataParameter)result).Precision = precision.Value;
}
if (scale.HasValue &&
(((IDbDataParameter)result).Scale != scale.Value))
{
((IDbDataParameter)result).Scale = scale.Value;
}
// .IsNullable
var isNullable = TypeSemantics.IsNullable(type);
if (isNullable != result.IsNullable)
{
result.IsNullable = isNullable;
}
return(result);
}
private DbCommand CreateCommand(DbProviderManifest providerManifest, DbCommandTree commandTree)
{
// DEVNOTE/CAUTION: This method could be called either from Remote or Local Provider.
// Ensure that the code works well with the both provider types.
// The methods called from the below code also need to be capable
// of handling both provider types.
//
// NOTE: Remote Provider is loaded at runtime, if available.
// This is done to remove hard dependency on Remote Provider and
// it might not be present in all scenarios. All Remote Provider
// type checks need to be done using RemoteProviderHelper class.
//
Check.NotNull(providerManifest, "providerManifest");
Check.NotNull(commandTree, "commandTree");
if (commandTree is DbFunctionCommandTree)
{
throw ADP1.NotSupported(EntityRes.GetString(EntityRes.StoredProceduresNotSupported));
}
var command = _isLocalProvider
? new SqlCeMultiCommand()
: (DbCommand)RemoteProviderHelper.CreateRemoteProviderType(RemoteProvider.SqlCeCommand);
command.Connection = null; // don't hold on to the connection when we're going to cache this forever;
List <DbParameter> parameters;
CommandType commandType;
var commandTexts = SqlGenerator.GenerateSql(commandTree, out parameters, out commandType, _isLocalProvider);
if (_isLocalProvider)
{
Debug.Assert(command is SqlCeMultiCommand, "SqlCeMultiCommand expected");
// Set the multiple command texts for the command object
((SqlCeMultiCommand)command).CommandTexts = commandTexts;
}
else
{
// Set the command text for the RDP case.
Debug.Assert(commandTexts.Length == 1, "BatchQueries are not supported in designer scenarios");
command.CommandText = commandTexts[0];
}
command.CommandType = commandType;
// Now make sure we populate the command's parameters from the CQT's parameters:
//
foreach (var queryParameter in commandTree.Parameters)
{
DbParameter parameter;
const bool ignoreMaxLengthFacet = false;
parameter = CreateSqlCeParameter(
queryParameter.Key, queryParameter.Value, DBNull.Value, ignoreMaxLengthFacet, _isLocalProvider);
command.Parameters.Add(parameter);
}
// Now add parameters added as part of SQL gen (note: this feature is only safe for DML SQL gen which
// does not support user parameters, where there is no risk of name collision)
//
if (null != parameters &&
0 < parameters.Count)
{
if (!(commandTree is DbDeleteCommandTree ||
commandTree is DbInsertCommandTree ||
commandTree is DbUpdateCommandTree))
{
throw ADP1.InternalError(ADP1.InternalErrorCode.SqlGenParametersNotPermitted);
}
foreach (var parameter in parameters)
{
command.Parameters.Add(parameter);
}
}
return(command);
}
