SQL Server、JDBC 和 Java 編程語言數據類型之間的默認映射
| SQL Server 類型 |
JDBC 類型 (java.sql.Types) |
Java 語言類型 |
| bigint |
BIGINT |
long |
| timestamp binary |
BINARY |
byte[] |
| bit |
BIT |
boolean |
| char |
CHAR |
String |
| decimal money smallmoney |
DECIMAL |
java.math.BigDecimal |
| float |
DOUBLE |
double |
| int |
INTEGER |
int |
| image varbinary(max) |
LONGVARBINARY |
byte[] |
| varchar(max) text |
LONGVARCHAR |
String |
| nchar |
CHAR NCHAR (Java SE 6.0) |
String |
| nvarchar |
VARCHAR NVARCHAR (Java SE 6.0) |
String |
| nvarchar(max) ntext |
LONGVARCHAR LONGNVARCHAR (Java SE 6.0) |
String |
| numeric |
NUMERIC |
java.math.BigDecimal |
| real |
REAL |
float |
| smallint |
SMALLINT |
short |
| datetime smalldatetime |
TIMESTAMP |
java.sql.Timestamp |
| varbinary udt |
VARBINARY |
byte[] |
| varchar |
VARCHAR |
String |
| tinyint |
TINYINT |
short |
| uniqueidentifier |
CHAR |
String |
| xml |
LONGVARCHAR SQLXML (Java SE 6.0) |
String SQLXML |
| time |
TIME (1) |
java.sql.Time (1) |
| date |
DATE |
java.sql.Date |
| datetime2 |
TIMESTAMP |
java.sql.Timestamp |
| datetimeoffset (2) |
microsoft.sql.Types.DATETIMEOFFSET |
microsoft.sql.DateTimeOffset |
Oracle和Java數據類型對應關系表
Mysql數據類型與java類型對應關系
Sql Server 數據類型與 C# 數據類型對照表
| 數據庫 |
C#程序 |
| int |
int32 |
| text |
string |
| bigint |
int64 |
| binary |
System.Byte[] |
| bit |
Boolean |
| char |
string |
| datetime |
System.DateTime |
| decimal |
System.Decimal |
| float |
System.Double |
| image |
System.Byte[] |
| money |
System.Decimal |
| nchar |
String |
| ntext |
String |
| numeric |
System.Decimal |
| nvarchar |
String |
| real |
System.Single |
| smalldatetime |
System.DateTime |
| smallint |
Int16 |
| smallmoney |
System.Decimal |
| timestamp |
System.DateTime |
| tinyint |
System.Byte |
| varbinary |
System.Byte[] |
| varchar |
String |
| Variant |
Object |
| unique identifier |
System.Guid |
MySQL 數據類型與 C# 數據類型對照表
| C# |
MySQL |
|||
| 類型 |
庫類型 |
GetFieldType(#) |
轉換 |
備注 |
| bool |
BOOL NOT NULL |
Boolean |
|
|
| bool? |
BOOL NULL |
Boolean |
|
|
| sbyte |
TINYINT NOT NULL |
SByte |
sbyte_ |
|
| sbyte? |
TINYINT NULL |
SByte |
sbyte_ |
|
| byte |
TINYINT UNSIGNED NOT NULL |
Byte |
|
|
| byte? |
TINYINT UNSIGNED NULL |
Byte |
|
|
| short |
SMALLINT NOT NULL |
Int16 |
|
|
| short? |
SMALLINT NULL |
Int16 |
|
|
| ushort |
SMALLINT UNSIGNED NOT NULL |
UInt16 |
ushort_ |
|
| ushort? |
SMALLINT UNSIGNED NULL |
UInt16 |
ushort_ |
|
| int |
INT NOT NULL |
Int32 |
|
|
| int? |
INT NULL |
Int32 |
|
|
| uint |
INT UNSIGNED NOT NULL |
UInt32 |
uint_ |
|
| uint? |
INT UNSIGNED NULL |
UInt32 |
uint_ |
|
| long |
BIGINT NOT NULL |
Int64 |
|
|
| long? |
BIGINT NULL |
Int64 |
|
|
| ulong |
BIGINT UNSIGNED NOT NULL |
UInt64 |
ulong_ |
|
| ulong? |
BIGINT UNSIGNED NULL |
UInt64 |
ulong_ |
|
| float |
FLOAT NOT NULL |
Single |
|
極值溢出 |
| float? |
FLOAT NULL |
Single |
|
極值溢出 |
| double |
DOUBLE NOT NULL |
Double |
|
|
| double? |
DOUBLE NULL |
Double |
|
|
| decimal |
DECIMAL NOT NULL |
Decimal |
|
極值溢出 |
| decimal? |
DECIMAL NULL |
Decimal |
|
極值溢出 |
| char |
CHARACTER NOT NULL |
String |
|
中文報錯 |
| char? |
CHARACTER NULL |
String |
|
中文報錯 |
| string |
VARCHAR(50) NOT NULL |
String |
|
|
| string |
VARCHAR(50) NULL |
String |
|
|
| DateTime |
DATETIME NOT NULL |
DateTime |
|
|
| DateTime? |
DATETIME NULL |
DateTime |
|
|
Oracle 數據類型與 C# 數據類型對照表
| C# |
Oracle |
|||
| 類型 |
庫類型 |
GetFieldType(#) |
轉換 |
備注 |
| bool |
CHAR(1) NOT NULL |
String |
bool_string |
|
| bool? |
CHAR(1) |
String |
bool_string |
|
| sbyte |
NUMBER(3) NOT NULL |
Int16 |
sbyte_short |
|
| sbyte? |
NUMBER(3) |
Int16 |
sbyte_short |
|
| byte |
NUMBER(3) NOT NULL |
Int16 |
byte_short |
|
| byte? |
NUMBER(3) |
Int16 |
byte_short |
|
| short |
NUMBER(5) NOT NULL |
Int32 |
short_int |
|
| short? |
NUMBER(5) |
Int32 |
short_int |
|
| ushort |
NUMBER(5) NOT NULL |
Int32 |
ushort_int |
|
| ushort? |
NUMBER(5) |
Int32 |
ushort_int |
|
| int |
NUMBER(10) NOT NULL |
Int64 |
int_long |
|
| int? |
NUMBER(10) |
Int64 |
int_long |
|
| uint |
NUMBER(10) NOT NULL |
Int64 |
uint_long |
|
| uint? |
NUMBER(10) |
Int64 |
uint_long |
|
| long |
NUMBER(19) NOT NULL |
Decimal |
long_decimal |
|
| long? |
NUMBER(19) |
Decimal |
long_decimal |
|
| ulong |
NUMBER(19) NOT NULL |
Decimal |
ulong_decimal |
|
| ulong? |
NUMBER(19) |
Decimal |
ulong_decimal |
|
| float |
BINARY_FLOAT NOT NULL |
Single |
|
|
| float? |
BINARY_FLOAT |
Single |
|
|
| double |
BINARY_DOUBLE NOT NULL |
Double |
|
極值溢出 |
| double? |
BINARY_DOUBLE |
Double |
|
極值溢出 |
| decimal |
DECIMAL(33,3) NOT NULL |
Decimal |
|
|
| decimal? |
DECIMAL(33,3) |
Decimal |
|
|
| char |
CHAR(1) NOT NULL |
String |
|
|
| char? |
CHAR(1) |
String |
|
|
| string |
VARCHAR(50) NOT NULL |
String |
|
不允許空字符 |
| string |
VARCHAR(50) |
String |
|
不允許空字符 |
| DateTime |
TIMESTAMP NOT NULL |
DateTime |
|
大值讀取報錯 |
| DateTime? |
TIMESTAMP |
DateTime |
|
大值讀取報錯 |