What is ResultSet meta data explain with example?
The metadata means data about data i.e. we can get further information from the data. If you have to get metadata of a table like total number of column, column name, column type etc. , ResultSetMetaData interface is useful because it provides methods to get metadata from the ResultSet object.
What are the functions of the JDBC ResultSetMetaData interface?
The ResultSetMetaData provides information about the obtained ResultSet object like, the number of columns, names of the columns, datatypes of the columns, name of the table etc… Following are some methods of ResultSetMetaData class. Retrieves the number of columns in the current ResultSet object.
What will be returned by the getMetaData () method of ResultSet interface?
The getMetaData() method of ResultSet interface retrieves the ResultSetMetaData object of the current ResultSet. This method returns a ResultSetMetaData object which holds the description of this ResultSet object’s columns.
Which one of the following method of ResultSetMetaData is used to get the data type of a column of a table?
getColumnType() method
The getColumnType() method of the ResultSetMetaData (interface) retrieves the type of the specified column in the current ResultSet object.
What is the difference between ResultSet and ResultSetMetaData?
ResultSetMetaData is an interface in java. sql package of JDBC API which is used to get the metadata about a ResultSet object. Whenever you query the database using SELECT statement, the result will be stored in a ResultSet object. Every ResultSet object is associated with one ResultSetMetaData object.
What is metadata in Java with example?
Given that metadata is a set of descriptive, structural and administrative data about a group of computer data (for example such as a database schema), Java Metadata Interface (or JMI) is a platform-neutral specification that defines the creation, storage, access, lookup and exchange of metadata in the Java programming …
Can we return ResultSet in Java?
Yes, just like any other objects in Java we can pass a ResultSet object as a parameter to a method and, return it from a method.
What is meta data in Java?
What is the use of wasNull () in ResultSet interface?
The wasNull() method of the ResultSet interface determines whether the last column read had a Null value. i.e. whenever you read the contents of a column of the ResultSet using the getter methods (getInt(), getString etc…) you can determine whether it (column) contains null values, using the wasNull() method.
What is the different between ResultSet and ResultSetMetaData?
What is difference between ResultSet and RowSet?
A ResultSet always maintains connection with the database. A RowSet can be connected, disconnected from the database. It cannot be serialized. A RowSet object can be serialized.
How do you pass ResultSet from one class to another?
- create an int variable in the correct scope and assign the value of exParam.
- My setPwdExpiryDays getter and setter are set to void return type.
- public Integer getPwdExpiryDays this is not returning void.
- Hello, I was taking about setPwdExpiryDays.
What is metadata example?
A simple example of metadata for a document might include a collection of information like the author, file size, the date the document was created, and keywords to describe the document. Metadata for a music file might include the artist’s name, the album, and the year it was released.
What is ResultSetMetaData in Java?
public interface ResultSetMetaData extends Wrapper. An object that can be used to get information about the types and properties of the columns in a ResultSet object.
What are types of ResultSet?
ResultSet Types
- 1) Forward Only (ResultSet. TYPE_FORWARD_ONLY) This type of ResultSet instance can move only in the forward direction from the first row to the last row.
- 2) Scroll Insensitive (ResultSet. TYPE_SCROLL_INSENSITIVE)
- 3) Scroll Sensitive (ResultSet. TYPE_SCROLL_SENSITIVE)
How do I convert a ResultSet to a list?
You need to use ResultSet#getString to fetch the name . Now, each time you fetch one record, get the name field and add it to your list. Now, since you haven’t given enough information about your DTO , so that part you need to find out, how to add this ArrayList to your DTO .
What is metadata and types?
There are three main types of metadata: descriptive, administrative, and structural. Descriptive metadata enables discovery, identification, and selection of resources. It can include elements such as title, author, and subjects. Administrative metadata facilities the management of resources.
Can ResultSet return null?
For get methods that return objects, the return value is null when the column in the ResultSet is null. For primitive types, null cannot be returned. In these cases, the value is 0 or false.
How many RowSet are available in JDBC?
A JDBC RowSet object holds tabular data in a style that makes it more adaptable and simpler to use than a result set. Oracle has defined five RowSet interfaces for the most frequent uses of a RowSet: JdbcRowSet. CachedRowSet.
What are the advantages of RowSet?
The advantage of RowSet is as follows: It is easy and flexible to use. It is by default scrollable and can be updated by default whereas ResultSet by default is only forwardable and read-only operation is valid there only.
How do I get all the ResultSet rows?
Getting the number of rows using methods
The last() method of the ResultSet interface moves the cursor to the last row of the ResultSet and, the getRow() method returns the index/position of the current row.
How do I create a ResultSet object?
JDBC ResultSet and Generic Class List Using Java Reflection Annotations
- Create a custom annotation.
- Create a Model class, which contains mapping fields to the ResultSet column names with the created annotation.
- Call the ResultSet.
- Load the ResultSet for each value into the object.
- Check for the Primitive type.
What are the 4 types of metadata?
Descriptive Metadata
- Unique identifiers (such as an ISBN)
- Physical attributes (such as file dimensions or Pantone colors)
- Bibliographic attributes (such as the author or creator, title, and keywords)
What is JDBC ODBC bridge driver in Java?
The JDBC-ODBC Bridge allows applications written in the Java programming language to use the JDBC API with many existing ODBC drivers. The Bridge is itself a driver based on JDBC technology (“JDBC driver”) that is defined in the class sun.
What is DatabaseMetaData in JDBC in Java?
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. Method.