程序包 org.hibernate.dialect

类 TypeNames

java.lang.Object

org.hibernate.dialect.TypeNames

public final class TypeNames
extends Object

This class maps a type to names. Associations may be marked with a capacity. Calling the get() method with a type and actual size n will return the associated name with smallest capacity >= n, if available and an unmarked default type otherwise. Eg, setting

        names.put( type,        "TEXT" );
        names.put( type,   255, "VARCHAR($l)" );
        names.put( type, 65534, "LONGVARCHAR($l)" );
 

will give you back the following:

  names.get( type )         // --> "TEXT" (default)
  names.get( type,    100 ) // --> "VARCHAR(100)" (100 is in [0:255])
  names.get( type,   1000 ) // --> "LONGVARCHAR(1000)" (1000 is in [256:65534])
  names.get( type, 100000 ) // --> "TEXT" (default)
 

On the other hand, simply putting

        names.put( type, "VARCHAR($l)" );
 

would result in

  names.get( type )        // --> "VARCHAR($l)" (will cause trouble)
  names.get( type, 100 )   // --> "VARCHAR(100)"
  names.get( type, 10000 ) // --> "VARCHAR(10000)"
 

作者:

Christoph Beck

构造器概要

构造器

构造器	说明
TypeNames()

方法概要

修饰符和类型	方法	说明
boolean	containsTypeName(String typeName)	Check whether or not the provided typeName exists.
String	get(int typeCode)	get default type name for specified type
String	get(int typeCode, long size, int precision, int scale)	get type name for specified type and size
void	put(int typeCode, long capacity, String value)	Register a weighted typeCode mapping
void	put(int typeCode, String value)	Register a default (non-weighted) typeCode mapping

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

TypeNames

public TypeNames()

方法详细资料

get

public String get(int typeCode)
           throws MappingException

get default type name for specified type

参数:

typeCode - the type key

返回:

the default type name associated with specified key

抛出:

MappingException - Indicates that no registrations were made for that typeCode

get

public String get(int typeCode,
                  long size,
                  int precision,
                  int scale)
           throws MappingException

get type name for specified type and size

参数:

typeCode - the type key

size - the SQL length

scale - the SQL scale

precision - the SQL precision

返回:

the associated name with smallest capacity >= size, if available and the default type name otherwise

抛出:

MappingException - Indicates that no registrations were made for that typeCode

put

public void put(int typeCode,
                long capacity,
                String value)

Register a weighted typeCode mapping

参数:

typeCode - the JDBC type code

capacity - The capacity for this weighting

value - The mapping (type name)

put

public void put(int typeCode,
                String value)

Register a default (non-weighted) typeCode mapping

参数:

typeCode - the type key

value - The mapping (type name)

containsTypeName

public boolean containsTypeName(String typeName)

Check whether or not the provided typeName exists.

参数:

typeName - the type name.

返回:

true if the given string has been registered as a type.