it.unibz.inf.ontop.dbschema

Class RDBMetadataExtractionTools

java.lang.Object

it.unibz.inf.ontop.dbschema.RDBMetadataExtractionTools

public class RDBMetadataExtractionTools
extends Object

HSQLDB http://www.hsqldb.org/doc/1.8/src/org/hsqldb/jdbc/jdbcDatabaseMetaData.html HSQLDB treats unquoted identifiers as case insensitive in SQL but stores them in upper case; it treats quoted identifiers as case sensitive and stores them verbatim. All jdbcDatabaseMetaData methods perform case-sensitive comparison between name (pattern) arguments and the corresponding identifier values as they are stored in the database. HSQLDB uses the standard SQL identifier quote character (the double quote character); getIdentifierQuoteString() always returns ". PostgreSQL ---------- http://www.postgresql.org/docs/9.1/static/sql-syntax-lexical.html Unquoted names are always folded to lower (!) case. Quoted identifier is formed by enclosing an arbitrary sequence of characters in double-quotes ("). (To include a double quote, write two double quotes.) A variant of quoted identifiers allows including escaped Unicode characters identified by their code points. This variant starts with U& (upper or lower case U followed by ampersand) immediately before the opening double quote, without any spaces in between, for example U&"foo". H2 -- http://h2database.com/html/grammar.html Names are not case sensitive (but it appears that the upper-case is the canonical form). Quoted names are case sensitive, and can contain spaces. Two double quotes can be used to create a single double quote inside an identifier. MS SQL Server ------------- https://msdn.microsoft.com/en-us/library/ms378535(v=sql.110).aspx When using the Microsoft JDBC Driver with a SQL Server database, getIdentifierQuoteString returns double quotation marks (""). MySQL ----- http://dev.mysql.com/doc/refman/5.0/en/identifier-case-sensitivity.html How table and database names are stored on disk and used in MySQL is affected by the lower_case_table_names system variable, which you can set when starting mysqld. Column, index, and stored routine names are not case sensitive on any platform, nor are column aliases.

Constructor Summary

Constructors

Constructor and Description
RDBMetadataExtractionTools()

Method Summary

Modifier and Type	Method and Description
static RDBMetadata	createMetadata(Connection conn, it.unibz.inf.ontop.model.type.TypeFactory typeFactory) Creates database metadata description (but does not load metadata)
static void	loadMetadata(RDBMetadata metadata, Connection conn, Set<it.unibz.inf.ontop.dbschema.RelationID> realTables) Retrieves the database metadata (table schema and database constraints) This method either uses the given list of tables or if it is null then it retrieves all the complete list of tables from the connection metadata

Methods inherited from class java.lang.Object

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

Constructor Detail

RDBMetadataExtractionTools

public RDBMetadataExtractionTools()

Method Detail

createMetadata

public static RDBMetadata createMetadata(Connection conn,
                                         it.unibz.inf.ontop.model.type.TypeFactory typeFactory)
                                  throws SQLException

Creates database metadata description (but does not load metadata)

Returns:

The database metadata object.

Throws:

SQLException

loadMetadata

public static void loadMetadata(RDBMetadata metadata,
                                Connection conn,
                                Set<it.unibz.inf.ontop.dbschema.RelationID> realTables)
                         throws SQLException

Retrieves the database metadata (table schema and database constraints) This method either uses the given list of tables or if it is null then it retrieves all the complete list of tables from the connection metadata

Throws:

SQLException