private static string GetInsertStatement(string tableName, DataRow row)
{
string columns = "";
string values = "";
foreach (DataColumn column in row.Table.Columns)
{
if (row[column] != DBNull.Value)
{
if (!string.IsNullOrWhiteSpace(columns))
{
columns += ", ";
values += ", ";
}
columns += string.Format("[{0}]", column.ColumnName);
dynamic value = row[column];
values += LiteralHelpers.ToSqlString(value);
}
}
return(string.Format("INSERT INTO [{0}] ({1}) VALUES ({2})", tableName, columns, values));
}
private string VisitConstantExpression(TypeUsage expressionType, object expressionValue)
{
StringBuilder result = new StringBuilder();
PrimitiveTypeKind typeKind;
// Model Types can be (at the time of this implementation):
// Binary, Boolean, Byte, DateTime, Decimal, Double, Guid, Int16, Int32, Int64,Single, String
if (expressionType.TryGetPrimitiveTypeKind(out typeKind))
{
switch (typeKind)
{
case PrimitiveTypeKind.Int32:
case PrimitiveTypeKind.Byte:
result.Append(expressionValue);
break;
case PrimitiveTypeKind.Binary:
result.Append(LiteralHelpers.ToSqlString((Byte[])expressionValue));
break;
case PrimitiveTypeKind.Boolean:
result.Append(LiteralHelpers.ToSqlString((bool)expressionValue));
break;
case PrimitiveTypeKind.DateTime:
result.Append(LiteralHelpers.SqlDateTime((System.DateTime)expressionValue));
break;
case PrimitiveTypeKind.Time:
result.Append(LiteralHelpers.SqlDayTime((System.DateTime)expressionValue));
break;
case PrimitiveTypeKind.DateTimeOffset:
throw new NotImplementedException("Jet does not implement DateTimeOffset");
case PrimitiveTypeKind.Decimal:
string strDecimal = ((Decimal)expressionValue).ToString(CultureInfo.InvariantCulture);
// if the decimal value has no decimal part, cast as decimal to preserve type
// if the number has precision > int64 max precision, it will be handled as decimal by sql server
// and does not need cast. if precision is lest then 20, then cast using Max(literal precision, sql default precision)
if (-1 == strDecimal.IndexOf('.') && (strDecimal.TrimStart(new char[] { '-' }).Length < 20))
{
byte precision = (Byte)strDecimal.Length;
FacetDescription precisionFacetDescription;
if (!expressionType.EdmType.TryGetTypeFacetDescriptionByName("precision", out precisionFacetDescription))
{
throw new InvalidOperationException("Decimal primitive type must have Precision facet");
}
if (precisionFacetDescription.DefaultValue != null)
{
precision = Math.Max(precision, (byte)precisionFacetDescription.DefaultValue);
}
if (precision <= 0)
{
throw new InvalidOperationException("Precision must be greater than zero");
}
result.Append("cast(");
result.Append(strDecimal);
result.Append(" as decimal(");
result.Append(precision.ToString(CultureInfo.InvariantCulture));
result.Append("))");
}
else
{
result.Append(strDecimal);
}
break;
case PrimitiveTypeKind.Double:
result.Append(((Double)expressionValue).ToString(CultureInfo.InvariantCulture));
break;
case PrimitiveTypeKind.Single:
result.Append(((Single)expressionValue).ToString(CultureInfo.InvariantCulture));
break;
case PrimitiveTypeKind.Int16:
case PrimitiveTypeKind.Int64:
result.Append(expressionValue);
break;
case PrimitiveTypeKind.String:
result.Append(LiteralHelpers.ToSqlString(expressionValue as string));
break;
case PrimitiveTypeKind.Guid:
result.Append(LiteralHelpers.ToSqlString((Guid)expressionValue));
break;
default:
// all known scalar types should been handled already.
throw new NotSupportedException("Primitive type kind " + typeKind + " is not supported by the Jet Provider");
}
}
else
{
throw new NotSupportedException();
}
return(result.ToString());
}