Type Mapping

Type Mapping (Default)

Note: Due to formatting issues, not all supported databases are displayed.

CSharp	MySql	SqlServer	PostgreSQL	Oracle	Sqlite	Dameng
bool | bool?	bit(1)	bit	bool	number(1)	boolean	number(1)
sbyte | sbyte?	tinyint(3)	smallint	int2	number(4)	smallint	number(4)
short | short?	smallint(6)	smallint	int2	number(6)	smallint	number(6)
int | int?	int(11)	int	int4	number(11)	integer	number(11)
long | long?	bigint(20)	bigint	int8	number(21)	integer	number(21)
byte | byte?	tinyint(3) unsigned	tinyint	int2	number(3)	int2	number(3)
ushort | ushort?	smallint(5) unsigned	int	int4	number(5)	unsigned	number(5)
uint | uint?	int(10) unsigned	bigint	int8	number(10)	decimal(10,0)	number(10)
ulong | ulong?	bigint(20) unsigned	decimal(20,0)	numeric(20,0)	number(20)	decimal(21,0)	number(20)
double | double?	double	float	float8	float(126)	double	double
float | float?	float	real	float4	float(63)	float	real
decimal | decimal?	decimal(10,2)	decimal(10,2)	numeric(10,2)	number(10,2)	decimal(10,2)	number(10,2)
Guid | Guid?	char(36)	uniqueidentifier	uuid	char(36 CHAR)	character(36)	char(36)
TimeSpan | TimeSpan?	time	time	time	interval day(2) to second(6)	bigint	-
DateTime | DateTime?	datetime	datetime	timestamp	timestamp(6)	datetime	timestamp(6)
DateTimeOffset | DateTimeOffset?	-	datetimeoffset	-	timestamp(6) with local time zone	-	timestamp(6)
Enum | Enum?	enum	int	int4	number(16)	mediumint	number(16)
FlagsEnum | FlagsEnum?	set	bigint	int8	number(32)	bigint	number(32)
byte[]	varbinary(255)	varbinary(255)	bytea	blob	blob	blob
string	varchar(255)	nvarchar(255)	varchar(255)	nvarchar2(255)	nvarchar(255)	nvarchar2(255)

For string specifying length [Column(DbType = "varchar(max)")] or [MaxLength(-1)] or [Column(StringLength = -1)], when length is -1, the mapping is as follows:

MySql	PostgreSQL	SqlServer	Oracle	Sqlite	Firebird	DuckDB	MsAccess	Dameng	Kingbase
text	text	varchar(max)	nclob	text	blob sub_type 1	text	longtext	text	text

Note: MySql [MaxLength(-2)] or [Column(StringLength = -2)] maps to longtext

For decimal specifying length [Column(Precision = 10, Scale = 2)]

MapType

Using MapType Enum -> string/int etc.:

class Table
{
    [Column(MapType = typeof(string))]
    public PeopleType t1 { get; set; }

    [Column(MapType = typeof(int))]
    public PeopleType t2 { get; set; }

    [Column(MapType = typeof(string))]
    public BigInteger t3 { get; set; }
}
public enum PeopleType { TaiWan, abc, HongKong }

Json

dotnet add package FreeSql.Extensions.JsonMap

fsql.UseJsonMap(); //Open

class Table
{
    public int Id { get; set; }

    [JsonMap]
    public TableOptions Options { get; set; }
}
class TableOptions
{
    public int Value1 { get; set; }
    public string Value2 { get; set; }
}

fsql.Select<Table>().Where(a => a.Options.Value1 == 100 && a.Options.Value2 == "xx").ToList();
//WHERE json_extract(a."Options",'$.Value1') = 100 AND json_extract(a."Options",'$.Value2') = 'xx'

TypeHandlers (Custom)

FreeSql.Internal.Utils.TypeHandlers.TryAdd(typeof(JsonPoco), new JsonPocoTypeHandler());
FreeSql.Internal.Utils.TypeHandlers.TryAdd(typeof(DateOnly), new DateOnlyTypeHandler());
FreeSql.Internal.Utils.TypeHandlers.TryAdd(typeof(DateTimeOffset), new DateTimeOffsetTypeHandler());

class Product
{
    public JsonPoco json { get; set; }
    public DateOnly date { get; set; }
    public DateTimeOffset dateTimeOffset { get; set; }
}
class JsonPoco
{
    public int a { get; set; }
    public int b { get; set; }
}
class JsonPocoTypeHandler : TypeHandler<JsonPoco>
{
    public override object Serialize(JsonPoco value) => JsonConvert.SerializeObject(value);
    public override JsonPoco Deserialize(object value) => JsonConvert.DeserializeObject<JsonPoco>((string)value);
    public override void FluentApi(FluentColumn col) => col.MapType(typeof(string)).StringLength(-1);
}
class DateOnlyTypeHandler : TypeHandler<DateOnly>
{
    public override object Serialize(DateOnly value) => value.ToString("yyyy-MM-dd");
    public override DateOnly Deserialize(object value) => DateOnly.TryParse(string.Concat(value), out var trydo) ? trydo : DateOnly.MinValue;
    public override void FluentApi(FluentColumn col) => col.MapType(typeof(string)).StringLength(12);
}
class DateTimeOffsetTypeHandler : TypeHandler<DateTimeOffset>
{
    public override object Serialize(DateTimeOffset value) => value.ToUniversalTime().ToString("yyyy-MM-dd HH:mm:ss");
    public override DateTimeOffset Deserialize(object value) => DateTimeOffset.TryParse((string)value, out var dts) ? dts : DateTimeOffset.MinValue;
    public override void FluentApi(FluentColumn col) => col.MapType(typeof(string)).DbType("datetime");
}

Type Mapping (Special)

FreeSql.Provider.MySql/MySqlConnector：

CSharp	MySql
MygisPoint	point
MygisLineString	linestring
MygisPolygon	polygon
MygisMultiPoint	multipoint
MygisMultiLineString	multilinestring
MygisMultiPolygon	multipolygon

If int, byte types specify DbType="tinyint(1)", please note that tinyint(1) is by default mapped to bool in ado.net. You can specify TreatTinyAsBoolean=false in the connection string to map tinyint(1) to SByte instead of bool.

FreeSql.Provider.PostgreSQL：

CSharp	PostgreSQL
BitArray	varbit(64)
NpgsqlPoint | NpgsqlPoint?	point
NpgsqlLine | NpgsqlLine?	line
NpgsqlLSeg | NpgsqlLSeg?	lseg
NpgsqlBox | NpgsqlBox?	box
NpgsqlPath | NpgsqlPath?	path
NpgsqlPolygon | NpgsqlPolygon?	polygon
NpgsqlCircle | NpgsqlCircle?	circle
(IPAddress Address, int Subnet) | (IPAddress Address, int Subnet)?

csharp	PostgreSQL
BitArray	varbit(64)
NpgsqlPoint | NpgsqlPoint?	point
NpgsqlLine | NpgsqlLine?	line
NpgsqlLSeg | NpgsqlLSeg?	lseg
NpgsqlBox | NpgsqlBox?	box
NpgsqlPath | NpgsqlPath?	path
NpgsqlPolygon | NpgsqlPolygon?	polygon
NpgsqlCircle | NpgsqlCircle?	circle
(IPAddress Address, int Subnet) | (IPAddress Address, int Subnet)?	cidr
IPAddress	inet
PhysicalAddress	macaddr
NpgsqlRange<int> | NpgsqlRange<int>?	int4range
NpgsqlRange<long> | NpgsqlRange<long>?	int8range
NpgsqlRange<decimal> | NpgsqlRange<decimal>?	numrange
NpgsqlRange<DateTime> | NpgsqlRange<DateTime>?	tsrange
PostgisPoint	geometry
PostgisLineString	geometry
PostgisPolygon	geometry
PostgisMultiPoint	geometry
PostgisMultiLineString	geometry
PostgisMultiPolygon	geometry
PostgisGeometry	geometry
PostgisGeometryCollection	geometry
Dictionary<string, string>	hstore
JToken	jsonb
JObject	jsonb
JArray	jsonb
Array	All the above types are supported, including default types

Rewrite/Re-read

Rewrite SQL on write and rewrite SQL on read, suitable for read/write scenarios with geography types.

[Column(DbType = "geography", 
    RewriteSql = "geography::STGeomFromText({0}, 4236)", 
    RereadSql = "{0}.STAsText()")]
public string geo { get; set; }

// Insert: INSERT INTO [ts_geocrud01]([id], [geo]) VALUES(@id_0, geography::STGeomFromText(@geo_0, 4236))

// Query: SELECT TOP 1 a.[id], a.[geo].STAsText() 
// FROM [ts_geocrud01] a 
// WHERE (a.[id] = 'c7227d5e-0bcf-4b71-8f0f-d69a552fe84e')