Skip to main content

Q) Explain the architecture of ResultSet?



A)
->A Resultset is divided into 3 parts.

1) Zero record area
2) Records area
3) No record area

->when the resultSet is open a logical pointer known as “cursor” points to zero record area.
->when cursor is pointing to zero record or no record area we should not process the record.     We get SQL Exception.
->java.sql.ResultSet object has around 15 methods to deal with cursor.
->next() method is most frequently used method.
->when next() method is called on ResultSet object, 2 things happen in the background.
  1) Cursor is moved in forward direction by one record area.
  2) It returns true if record exists there otherwise false.
->To process the record, i.e. to retrieve the record each column value of the record (row) of the ResultSet object, getxxx() methods are available. These methods take column member in the ResultSet records as argument and return the column value. Relational table column type influences the kind of getxxx method we need to call on ResultSet object.

Some example for getxxx() methods :
getFloat()
getString()
getInt()
getBytes()

Comments

Post a Comment

Popular posts from this blog

Q) What is JDBC driver? What is its role in java database connection?

A) ->A translation software written in java according o JDBC specification is nothing but “JDBC driver”. -> JDBC driver implements JDBC API. Use single API. JDBC driver role: They are 4 roles   1)       Establishing connection between JDBC client and database server. 2)       Receiving JDBC method calls made by JDBC client while performing database (CRUD) operations. 3)       Translating java method calls into DBMS understandable calls and forwarding them to database server. 4)       Receiving the results from database server. Translating them into java format and handling over the same to the JDBC client.
Post a Comment
Read more

Q) What is ODBC?

A) ->open database connectivity is a technology from MS that enables any language program (other than java) to communication with database Management System. ->in java program ODBC is directly not allowed for the fallowing reasons 1) OS dependency 2) Procedural oriented approach 3) Security thread
Post a Comment
Read more

Q) What is MyEclipse?

A) ->MyEclipse is one of the IDEs (Integrated Development Environment) used in software industry to develop java based applications. ->using My Eclipse IDE we can develop, deploy, execute, debug and test java applications.
Post a Comment
Read more