org.melati.poem.dbms
Class Oracle

java.lang.Object
  org.melati.poem.dbms.AnsiStandard
      org.melati.poem.dbms.Oracle

All Implemented Interfaces:

Dbms

public class Oracle
extends AnsiStandard

A Driver for Oracle (http://www.oracle.com/).

To do something:

Testing required, code has been added to keep up with the interface without testing.

Nested Class Summary

static class	Oracle.OracleBooleanPoemType Translates an Oracle Boolean into a Poem BooleanPoemType.
static class	Oracle.OracleStringPoemType Translates a Oracle String into a Poem StringPoemType.

Field Summary

static int

oracleTextHack Oracle does not have a pleasant TEXT datatype, so we use an arbetary value in a VARCHAR.

Fields inherited from class org.melati.poem.dbms.AnsiStandard

schema

Constructor Summary

Oracle()
Constructor.

Method Summary

String	booleanTrueExpression(Column booleanColumn) Accomodate lack of boolean types.
PoemType	canRepresent(PoemType storage, PoemType type) Enable one PoemType to represent another, for example a bit to represent a boolean.
SQLPoemType	defaultPoemTypeOfColumnMetaData(ResultSet md) The simplest POEM type corresponding to a JDBC description from the database.
String	getBinarySqlDefinition(int size) Accomodate different treatment of different sized binary data.
String	getForeignKeyDefinition(String tableName, String fieldName, String targetTableName, String targetTableFieldName, String fixName) If Foreign key definitions are part of field definitions, otherwise blank (silently unsupported).
String	getLongSqlDefinition() Accomodate Long / Bigint deviants.
String	getPrimaryKeyDefinition(String fieldName) Return the PRIMARY KEY definition string for this dbms.
String	getSchema() Get the user we are connected as and return that as the schema.
String	getSqlDefaultValue(SQLType sqlType) Used to set a not null value when creating a non nullable column.
String	getSqlDefinition(String sqlTypeName) Retrieve a SQL type keyword used by the DBMS for the given Melati type name.
String	getStringSqlDefinition(int size) Accomodate String / Text distinction.
String	melatiName(String name) Reverse the mapping in unreservedName.
String	sqlBooleanValueOfRaw(Object raw) Accomodate different true and false values.
String	unreservedName(String name) A pair of functions for getting around keywords which make your JDBC driver barf, as 'group' does for MySQL.

Methods inherited from class org.melati.poem.dbms.AnsiStandard

alterColumnNotNullableSQL, canBeIndexed, canDropColumns, canStoreBlobs, caseInsensitiveRegExpSQL, createTableOptionsSql, createTableSql, createTableTypeQualifierSql, exceptionForUpdate, exceptionForUpdate, getConnection, getDriverClassName, getDriverLoaded, getFixedPtSqlDefinition, getIndexLength, getJdbcMetadataName, getQuotedName, getQuotedValue, givesCapabilitySQL, loadDriver, preparedStatementPlaceholder, selectLimit, setDriverClassName, setDriverLoaded, shutdown, tableInitialisationSql, toString, unloadDriver

Methods inherited from class java.lang.Object

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

Field Detail

oracleTextHack

public static int oracleTextHack

Oracle does not have a pleasant TEXT datatype, so we use an arbetary value in a VARCHAR.

Constructor Detail

Oracle

public Oracle()

Constructor.

Method Detail

getSchema

public String getSchema()

Get the user we are connected as and return that as the schema. The db schema name to use, if any. This is typically the JDBC connection URL User string.

Specified by:

getSchema in interface Dbms

Overrides:

getSchema in class AnsiStandard

Returns:

the schema to use or null if not required

See Also:

AnsiStandard.getSchema(), Dbms.getSchema()

getStringSqlDefinition

public String getStringSqlDefinition(int size)
                              throws SQLException

Accomodate String / Text distinction.

Specified by:

getStringSqlDefinition in interface Dbms

Overrides:

getStringSqlDefinition in class AnsiStandard

Parameters:

size - the string length (-1 means no limit)

Returns:

the SQL definition for a string of this size

Throws:

SQLException

See Also:

AnsiStandard.getStringSqlDefinition(int)

getLongSqlDefinition

public String getLongSqlDefinition()

Accomodate Long / Bigint deviants.

Specified by:

getLongSqlDefinition in interface Dbms

Overrides:

getLongSqlDefinition in class AnsiStandard

Returns:

the keyword to use.

See Also:

AnsiStandard.getLongSqlDefinition()

getSqlDefinition

public String getSqlDefinition(String sqlTypeName)

Retrieve a SQL type keyword used by the DBMS for the given Melati type name. Override this in non-Ansi standard dbms to handle variants.

Specified by:

getSqlDefinition in interface Dbms

Overrides:

getSqlDefinition in class AnsiStandard

Parameters:

sqlTypeName - the Melati internal type name

Returns:

this dbms specific type keyword

See Also:

AnsiStandard.getSqlDefinition(java.lang.String)

sqlBooleanValueOfRaw

public String sqlBooleanValueOfRaw(Object raw)

Accomodate different true and false values.

Specified by:

sqlBooleanValueOfRaw in interface Dbms

Overrides:

sqlBooleanValueOfRaw in class AnsiStandard

Returns:

the DBMS specific truth and false values

See Also:

AnsiStandard.sqlBooleanValueOfRaw(java.lang.Object)

getBinarySqlDefinition

public String getBinarySqlDefinition(int size)
                              throws SQLException

Accomodate different treatment of different sized binary data.

Specified by:

getBinarySqlDefinition in interface Dbms

Overrides:

getBinarySqlDefinition in class AnsiStandard

Parameters:

size - how big the field is

Returns:

the keyword to use

Throws:

SQLException

See Also:

AnsiStandard.getBinarySqlDefinition(int)

unreservedName

public String unreservedName(String name)

A pair of functions for getting around keywords which make your JDBC driver barf, as 'group' does for MySQL. Translate special names to non special ones.

Specified by:

unreservedName in interface Dbms

Overrides:

unreservedName in class AnsiStandard

Parameters:

name - the field or table name

Returns:

the name translated if necessary

See Also:

AnsiStandard.unreservedName(java.lang.String)

melatiName

public String melatiName(String name)

Reverse the mapping in unreservedName.

Specified by:

melatiName in interface Dbms

Overrides:

melatiName in class AnsiStandard

Parameters:

name - an SQL name

Returns:

the coresponding name to use within Melati

See Also:

AnsiStandard.melatiName(java.lang.String)

canRepresent

public PoemType canRepresent(PoemType storage,
                             PoemType type)

Enable one PoemType to represent another, for example a bit to represent a boolean.

Specified by:

canRepresent in interface Dbms

Overrides:

canRepresent in class AnsiStandard

Parameters:

storage - the POEM native type

type - the current type

Returns:

the PoemType to use

See Also:

(org.melati.poem.PoemType, org.melati.poem.PoemType)

defaultPoemTypeOfColumnMetaData

public SQLPoemType defaultPoemTypeOfColumnMetaData(ResultSet md)
                                            throws SQLException

The simplest POEM type corresponding to a JDBC description from the database.

Specified by:

defaultPoemTypeOfColumnMetaData in interface Dbms

Overrides:

defaultPoemTypeOfColumnMetaData in class AnsiStandard

Parameters:

md - the JDBC metadata

Returns:

the PoemType to use

Throws:

SQLException - potentially

See Also:

AnsiStandard.defaultPoemTypeOfColumnMetaData(java.sql.ResultSet)

getForeignKeyDefinition

public String getForeignKeyDefinition(String tableName,
                                      String fieldName,
                                      String targetTableName,
                                      String targetTableFieldName,
                                      String fixName)

If Foreign key definitions are part of field definitions, otherwise blank (silently unsupported).

Specified by:

getForeignKeyDefinition in interface Dbms

Overrides:

getForeignKeyDefinition in class AnsiStandard

Parameters:

tableName - the table that this column is in, unquoted

fieldName - often the name of the foreign table, unquoted

targetTableName - the table that this is a foreign key into, unquoted

targetTableFieldName - name of the primary key field of the foreign table, often id, unquoted

fixName - name of the IntegrityFix

Returns:

The definition string

See Also:

AnsiStandard.getForeignKeyDefinition(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String)

getPrimaryKeyDefinition

public String getPrimaryKeyDefinition(String fieldName)

Return the PRIMARY KEY definition string for this dbms.

Specified by:

getPrimaryKeyDefinition in interface Dbms

Overrides:

getPrimaryKeyDefinition in class AnsiStandard

Parameters:

fieldName - the table Troid column, often id, unquoted

Returns:

The definition string

See Also:

AnsiStandard.getPrimaryKeyDefinition(java.lang.String)

booleanTrueExpression

public String booleanTrueExpression(Column booleanColumn)

Accomodate lack of boolean types.

Specified by:

booleanTrueExpression in interface Dbms

Overrides:

booleanTrueExpression in class AnsiStandard

Returns:

an expresion that evaluates to True ie the column name or column name = 1

See Also:

Dbms.booleanTrueExpression(org.melati.poem.Column)

getSqlDefaultValue

public String getSqlDefaultValue(SQLType sqlType)

Used to set a not null value when creating a non nullable column.

Specified by:

getSqlDefaultValue in interface Dbms

Overrides:

getSqlDefaultValue in class AnsiStandard

Parameters:

sqlType - the type name

Returns:

a String suitable for substitution in UPDATE table SET field = ?

See Also:

AnsiStandard.getSqlDefaultValue(org.melati.poem.SQLType)