Package org.firebirdsql.jdbc.metadata

Class TypeMetadata

java.lang.Object

org.firebirdsql.jdbc.metadata.TypeMetadata

public class TypeMetadata
extends Object

Helper class to determine type metadata conforming to expectations of DatabaseMetaData.

Since:

4.0

Author:

Mark Rotteveel

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	TypeMetadata.Builder
static enum	TypeMetadata.TypeBehaviour

Method Summary

Modifier and Type	Method	Description
static TypeMetadata.Builder	builder(FirebirdSupportInfo supportInfo)	Creates type metadata builder.
Integer	getCharOctetLength()
Integer	getColumnSize()	Returns the column size (precision) of the type.
static int	getDataType(int sqlType, int sqlSubType, int sqlScale, int characterSetId)	Derives the JDBC data type from Types or JaybirdTypeCodes from metadata information.
static String	getDataTypeName(int sqlType, int sqlSubType, int sqlScale)	Derives the JDBC/SQL type name from metadata information.
int	getJdbcType()
Integer	getLength()
int	getRadix()
Integer	getScale()	Returns the scale of the field.
String	getSqlTypeName()

Methods inherited from class java.lang.Object

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

Method Details

getJdbcType

public int getJdbcType()

Returns:

The Types or JaybirdTypeCodes code for this datatype

getSqlTypeName

public String getSqlTypeName()

Returns:

The SQL datatype name, returns "NULL" if the type is unknown

getColumnSize

public Integer getColumnSize()

Returns the column size (precision) of the type.

The value returned follows the definition used in DatabaseMetaData, as established in DatabaseMetaData.getColumns(String, String, String, String) for COLUMN_SIZE. The same definition is used for database metadata columns PRECISION in, among others, DatabaseMetaData.getFunctionColumns(String, String, String, String).

This method will also return any non-zero precision information stored for other datatypes than those listed in the COLUMN_SIZE definition in the JDBC API.

Returns:

The column size as defined in DatabaseMetaData, or null.

getLength

public Integer getLength()

Returns:

The field length in bytes

getScale

public Integer getScale()

Returns the scale of the field.

For numerical types, returns a zero or positive scale. For types without scale, it returns null, for types that have a non-zero scale in the Firebird metadata, it returns the scale as stored.

Returns:

The scale of a field, or null.

getRadix

public int getRadix()

Returns:

The radix of numerical precision (either 2 or 10; returns 10 for non-numerical, non-boolean types.

getCharOctetLength

public Integer getCharOctetLength()

Returns:

The maximum number of bytes for a character type column, null otherwise

builder

public static TypeMetadata.Builder builder(FirebirdSupportInfo supportInfo)

Creates type metadata builder.

Parameters:

supportInfo - Firebird support info

Returns:

Builder for type metadata

getDataType

public static int getDataType(int sqlType,
 int sqlSubType,
 int sqlScale,
 int characterSetId)

Derives the JDBC data type from Types or JaybirdTypeCodes from metadata information.

Parameters:

sqlType - Firebird type code as used in the metadata tables

sqlSubType - Firebird sub-type code as used in the metadata tables

sqlScale - Firebird scale as used in the metadata tables

characterSetId - Character set id as used in the metadata tables

Returns:

JDBC data type code.

getDataTypeName

public static String getDataTypeName(int sqlType,
 int sqlSubType,
 int sqlScale)

Derives the JDBC/SQL type name from metadata information.

Parameters:

sqlType - Firebird type code as used in the metadata tables

sqlSubType - Firebird sub-type code as used in the metadata tables

sqlScale - Firebird scale as used in the metadata tables

Returns:

JDBC/SQL type name