The database has emerged as a major business tool across all enterprises, and the concept of database metadata has become a crucial topic. Metadata, which can be broadly defined as “data about data,” refers to the searchable definitions used to locate information. On the other hand, database metadata, which can be broadly defined as “data about database data,” refers to the searchable definitions used to locate database metadata(such as a list of all the tables for a specific schema). For example, you may use database metadata to generate web-based applications. Or, you may use database metadata to reverse-engineer the whole database and dynamically build your desired SQL queries.
JDBC allows clients to discover a large amount of metadata information about a database (including tables, views, columns, stored procedures, and so on) and any given ResultSet via metadata classes.
Most of JDBC’s metadata consists of information about one of two things:
You should use DatabaseMetaData to find information about your database, such as its capabilities and structure, and use ResultSetMetaData to find information about the results of a SQL query, such as size and types of columns.
JDBC provides the following important interfaces that deal with database and result set metadata:
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