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This is the database after the deletion: mysql> select id, filename from datafiles; +----+----------+ | id | filename | +----+----------+ | 20 | file2 | +----+----------+ 1 row in set (0.00 sec)

Returns a list of catalogs of information (as a ResultSet object) in that database. With the JDBC-ODBC bridge driver, you get a list of databases registered with ODBC. According to JDBC, a database may have a set of catalogs, and each catalog may have a set of schemas. The terms catalog and schema can have different meanings depending on the database vendor. In general, the DBMS maintains a set of tables containing information about most of the objects in the database. These tables and views are collectively known as the catalog. The catalog tables contain metadata about objects such as tables, views, indexes, stored procedures, triggers, and constraints. To do anything (read, write, update) with these catalog tables and views, you need a special privilege. It is the DBMS s responsibility to ensure that the catalog contains accurate descriptions of the metadata objects in the database at all times. Oracle treats schema as a database name, while MySQL treats catalog as a database name. So, to get the name of databases from Oracle, you must use getSchemas(); to get the name of databases from MySQL, you must use getCatalogs(). Retrieves the schema names (as a ResultSet object) available in this database. Typically, a schema is a set of named objects. Schemas provide a logical classification of database objects (tables, views, aliases, stored procedures, user-defined types, and triggers) in an RDBMS. Returns table names for all tables matching tableNames and all columns matching columnNames.

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The MySQL solution is identical to the Oracle solution with the exception of getConnection(), which returns a MySQL Connection object. You can download the complete MySQL solution from the book s Web site.

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The following is getConnection() for the MySQL database: public static Connection getConnection() throws Exception { String driver = "org.gjt.mm.mysql.Driver"; String url = "jdbc:mysql://localhost/octopus"; String username = "root"; String password = "root"; Class.forName(driver); // load MySQL driver return DriverManager.getConnection(url, username, password); }

getSchemas()

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If you have the choice of manipulating large text data (a large text column of a record such as the CLOB data type), should you use java.lang.String or java.sql.Clob Which has the best performance For better performance, you should use java.sql.Clob, since it does not extract any data from the database until you explicitly ask it to (by invoking the getAsciiStream() or getCharacterStream() method). The JDBC data type java.sql.Clob wraps a database locator (which is essentially a pointer to char). That pointer is a rather large number (between 32 and 256 bits in size), but the effort to extract it from the database is insignificant next to extracting the full CLOB content. For insertion into the database, you should use java.lang.String since data has not been uploaded to the database yet. Therefore, use the java.sql.Clob object only for data extraction (whenever possible).

ate, Time, and Timestamp are important data types in commercial and banking applications For example, the following are some of their uses: Time of airline arrival Date of purchase Hire date of an employee Update date of employee s salary Purge date of database Purchase date of items Account creation date Account expiration date The purpose of this chapter is to provide snippets and code samples that deal with Date, Time, and Timestamp Please note that most of the solutions are provided as independent static methods (In other words, these methods do not depend on external static data structures and rely only on the passed input arguments; therefore, you can use these methods just as they appear in this chapter) The javasql package provides the following classes that deal with date-related data types (portions of these descriptions were taken from the Java 2 Platform, Standard Edition 14.

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