c#数据类型 与sql的对应关系 以及 取值范围
| Short Name | .NET Class | Type | Width | Range (bits) | SQL Datatype (Closest Match) | Constraint to use (if needed in table definition) |
|---|---|---|---|---|---|---|
|
byte |
Byte |
Unsigned integer |
8 |
0 to 255 |
tinyint | |
|
sbyte |
SByte |
Signed integer |
8 |
-128 to 127 |
smallint | [ColName] Between -128 AND 127 |
|
int |
Int32 |
Signed integer |
32 |
-2,147,483,648 to 2,147,483,647 |
int | |
|
uint |
UInt32 |
Unsigned integer |
32 |
0 to 4294967295 |
bigint | [ColName] Between 0 AND 4294967295 |
|
short |
Int16 |
Signed integer |
16 |
-32,768 to 32,767 |
smallint | |
|
ushort |
UInt16 |
Unsigned integer |
16 |
0 to 65535 |
int | [ColName] Between 0 AND 65535 |
|
long |
Int64 |
Signed integer |
64 |
-922337203685477508 to 922337203685477507 |
bigint | |
|
ulong |
UInt64 |
Unsigned integer |
64 |
0 to 18446744073709551615 |
decimal(20,0) | [ColName] Between 0 AND 18446744073709551615 |
|
float |
Single |
Single-precision floating point type |
32 |
-3.402823e38 to 3.402823e38 |
real | |
|
double |
Double |
Double-precision floating point type |
64 |
-1.79769313486232e308 to 1.79769313486232e308 |
float | |
|
bool |
Boolean |
Logical Boolean type |
8 |
True or false |
bit | |
|
decimal |
Decimal |
Precise fractional or integral type that can represent decimal numbers with 29 significant digits |
128 |
±1.0 × 10e-28 to ±7.9 × 10e28 |
decimal (can go 38 significant in SQL need to limit to 29 for here.) |
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