Interface database metadata
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The DatabaseMetaData interface encapsulates information related to the database and driver, such as supported features, data types, and details like the database name and version. It provides methods to check support for specific functionality like correlated subqueries, batch updates, and whether deletions are visible in result sets. The Connection object's getMetaData() method is used to retrieve the DatabaseMetaData instance.
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Midao is a project that unites several data-oriented projects under an umbrella. It aims to simplify working with local, remote, distributed, document, and relational databases with a single API. Midao JDBC, which was already released, simplifies working with relational databases using Java JDBC by handling transactions, metadata, types, input/output processing, and more. Future Midao components will simplify working with other data storage systems and are planned for release by the end of 2014 or 2015. The Midao libraries are developed in Java and licensed under the Apache License Version 2.0.
4-INTERDUCATION TO JDBC-2019.ppt
JDBC provides a standard interface for connecting Java applications to different database systems. It allows Java programs to contain database-independent code. The key steps in a basic JDBC program are: 1) importing JDBC packages, 2) loading and registering the JDBC driver, 3) connecting to the database, 4) creating statements to execute queries, 5) executing queries and processing result sets, and 6) closing connections. JDBC supports different types of drivers including JDBC-ODBC bridge drivers, native API drivers, and pure Java drivers that communicate directly with databases.
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Interface database metadata
- 2. • public interface DatabaseMetaDataextends Wrapper
- 3. • • • • • • • • • The java.sql.DatabaseMetaData is an interface implemented by the JDBC driver provider. The DatabaseMetaData object encapsulates all the information related to the database and driver. We know that different DBMS often support different features and data types and implement those features in different ways. The DatabaseMetaData object is useful for the following operations while creating a generic application, such as Hibernate, with maximum portability and frameworks: 1. to use the functionalities of DBMS in combination with JDBC Driver. For example, the DatabaseMetaData.supportsCorrelatedSubquries() method is used to find whether it is possible to use a correlated subquery or not. 2. to get the database details, such as DB vendor name, product name, and version. 3. to find the support for optional JDBC features from a JDBC driver. For example, the DatabaseMetaData.supportsBatchUpdates() method is used to find whether it is possible to use batch updates or not. 4. to find the approach used with JDBC driver to implement the advanced JDBC options. We use the Connection.getMetaData() method to get the DatabaseMetaData object.
- 4. ownDeleteAreVisible() • Used to find whether the deletion is visible as replaced with an empty row in the ResultSet object of the given type. • It returns false if the ResultSet object still contains the deleted row, if the deletion is not visible as a change to the ResultSet object of the given type.