What is metadata in JDBC?
JDBC provides a Java API to read the actual data stored in database tables. Metadata means data about the data such as table names, column names, and column types. In this tutorial, we’ll learn how to extract different types of metadata using the DatabaseMetaData interface.
How do I find database metadata?
To get the metadata from your source, call the getMetaData() method using the Connection object that was created in the last part of this series. Here is a simple code to extract all the user defined tables from your data source. The important method calls to notice are the connection.
How we can retrieve table information in JDBC?
Retrieve data example
- Load the JDBC driver, using the forName(String className) API method of the Class.
- Create a Connection to the database.
- Create a Statement, using the createStatement() API method of the Connection.
- Execute the query to the database, using the executeQuery(String sql) API method.
What is the metadata in Java?
Metadata in Java is used to know the data about data. It means for example table field names, field data type, field data type length, database table names, number of databases that existed in the specific database, etc.
What is role of database metadata in JDBC?
The DatabaseMetaData interface provides methods to get information about the database you have connected with like, database name, database driver version, maximum column length etc… Following are some methods of DatabaseMetaData class. Retrieves the user name. Retrieves the name of the current database.
Which of the following is metadata interface of JDBC?
The API involves several interfaces that provide metadata information service to the client. The client retrieves this information via the JDBC Driver Manager. The Driver Manager acts as a interface between the actual database and the APIs. Vendor-specific databases provide their own Java driver (Type 4 driver).
Which of the following is the metadata interface of JDBC?
What is meta data and discuss their types which are available in JDBC?
Generally, Data about data is known as metadata. The DatabaseMetaData interface provides methods to get information about the database you have connected with like, database name, database driver version, maximum column length etc… Following are some methods of DatabaseMetaData class. Retrieves the user name.
What object is used to store the fetched data in JDBC?
Answer: ResultSet is used to store and retrieve the data from DB. When executeQuery() method has executed, it will return ResultSet object. We can use that ResultSet object in our program to perform the logic.
What is technical metadata?
Technical metadata provides information on the technical properties of a digital file or the particular hardware and software environments required in order to render or process digital information.
Which object do you can create an object of database metadata?
You obtain the DatabaseMetaData object from a Connection , like this: DatabaseMetaData databaseMetaData = connection. getMetaData(); Once you have obtained this DatabaseMetaData instance, you can call methods on it to obtain the meta data about the database.
What does metadata mean in the JDBC interface?
Metadata means data about the data such as table names, column names, and column types. In this tutorial, we’ll learn how to extract different types of metadata using the DatabaseMetaData interface. 2. DatabaseMetaData Interface
What do I need to know about database metadata?
Metadata generally includes the name, size, and number of rows of each table present in a database, along with the columns in each table, their data types, precisions, etc. With this in mind, let’s start with the tutorial and learn how you can fetch metadata from any data source.
What is the purpose of the databasemetadata interface?
DatabaseMetaData Interface DatabaseMetaData is an interface that provides a variety of methods to obtain comprehensive information about the database. This information is useful for creating database tools that allow users to explore the structure of different databases.
How is the interface implemented in JDBC driver?
This interface is implemented by JDBC driver to let users (programmers) know the capabilities of the DBMS as well as information about the JDBC driver itself. You know, different DBMSs often support different features, implement features in different ways, and use different data types.