Java and C # with SQL Server, MySQL and Oracle data types comparison map

SQL Server 's default mapping, JDBC, and Java programming language data types

SQL Server Type	JDBC type (java.sql.Types)	Java language types
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 Ncःahri (6.0 Java)	String
nvarchar	VARCHAR NVARCHAR (6.0 Java)	String
nvarchar(max) ntext	LONGVARCHAR LONGNVARCHAR (6.0 Java)	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数据类型对应关系表

  

 

Mysql数据类型与java类型对应关系

 

 

Sql Server 数据类型与 C# 数据类型对照表

数据库	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 数据类型与 C# 数据类型对照表

C#	MySQL
类型	库类型	GetFieldType(#)	转换	备注
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		极值溢出
float?	FLOAT NULL	Single		极值溢出
double	DOUBLE NOT NULL	Double
double?	DOUBLE NULL	Double
decimal	DECIMAL NOT NULL	Decimal		极值溢出
decimal?	DECIMAL NULL	Decimal		极值溢出
char	CHARACTER NOT NULL	String		中文报错
char?	CHARACTER NULL	String		中文报错
string	VARCHAR(50) NOT NULL	String
string	VARCHAR(50) NULL	String
DateTime	DATETIME NOT NULL	DateTime
DateTime?	DATETIME NULL	DateTime

 

Oracle 数据类型与 C# 数据类型对照表

C#	Oracle
类型	库类型	GetFieldType(#)	转换	备注
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		极值溢出
double?	BINARY_DOUBLE	Double		极值溢出
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		不允许空字符
string	VARCHAR(50)	String		不允许空字符
DateTime	TIMESTAMP NOT NULL	DateTime		大值读取报错
DateTime?	TIMESTAMP	DateTime		大值读取报错