That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. All rights reserved.
Use is subject to license terms. Also see the documentation redistribution policy. The constant indicating the concurrency mode for a ResultSet object that may be updated. The constant indicating that the rows in a result set will be processed in a forward direction; first-to-last. The constant indicating that the rows in a result set will be processed in a reverse direction; last-to-first.
The constant indicating that the order in which rows in a result set will be processed is unknown. The constant indicating that open ResultSet objects with this holdability will remain open when the current transaction is commited. The constant indicating the type for a ResultSet object whose cursor may move only forward. The constant indicating the type for a ResultSet object that is scrollable but generally not sensitive to changes to the data that underlies the ResultSet.
The constant indicating the type for a ResultSet object that is scrollable and generally sensitive to changes to the data that underlies the ResultSet. Moves the cursor to the end of this ResultSet object, just after the last row.
Moves the cursor to the front of this ResultSet object, just before the first row. Cancels the updates made to the current row in this ResultSet object. Releases this ResultSet object's database and JDBC resources immediately instead of waiting for this to happen when it is automatically closed. Deletes the current row from this ResultSet object and from the underlying database. Maps the given ResultSet column label to its ResultSet column index. Retrieves the value of the designated column in the current row of this ResultSet object as an Array object in the Java programming language.
Retrieves the value of the designated column in the current row of this ResultSet object as a stream of uninterpreted bytes.
Retrieves the value of the designated column in the current row of this ResultSet object as a stream of uninterpreted byte s. Retrieves the value of the designated column in the current row of this ResultSet object as a Blob object in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a boolean in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a byte in the Java programming language.
Retrieves the value of the designated column in the current row of this ResultSet object as a byte array in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a Clob object in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a double in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a float in the Java programming language.
Retrieves the value of the designated column in the current row of this ResultSet object as an int in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a long in the Java programming language. Retrieves the number, types and properties of this ResultSet object's columns. Retrieves the value of the designated column in the current row of this ResultSet object as a NClob object in the Java programming language.
Retrieves the value of the designated column in the current row of this ResultSet object as a String in the Java programming language. Gets the value of the designated column in the current row of this ResultSet object as an Object in the Java programming language.
Retrieves the value of the designated column in the current row of this ResultSet object and will convert from the SQL type of the column to the requested Java data type, if the conversion is supported. Retrieves the value of the designated column in the current row of this ResultSet object as an Object in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet object as a Ref object in the Java programming language.
Retrieves the value of the designated column in the current row of this ResultSet object as a short in the Java programming language. Retrieves the value of the designated column in the current row of this ResultSet as a java. Retrieves the Statement object that produced this ResultSet object. Retrieves the first warning reported by calls on this ResultSet object. Inserts the contents of the insert row into this ResultSet object and into the database. Retrieves whether the cursor is after the last row in this ResultSet object.
Retrieves whether the cursor is before the first row in this ResultSet object. Retrieves whether the cursor is on the first row of this ResultSet object. Retrieves whether the cursor is on the last row of this ResultSet object.
Gives a hint as to the direction in which the rows in this ResultSet object will be processed. Gives the JDBC driver a hint as to the number of rows that should be fetched from the database when more rows are needed for this ResultSet object. Updates the designated column with an ascii stream value, which will have the specified number of bytes.
Updates the designated column with a binary stream value, which will have the specified number of bytes. Updates the designated column using the given input stream, which will have the specified number of bytes. Updates the designated column with a character stream value, which will have the specified number of bytes. Updates the designated column using the given Reader object, which is the given number of characters long.
Updates the designated column using the given Reader The data will be read from the stream as needed until end-of-stream is reached. Updates the underlying database with the new contents of the current row of this ResultSet object. The constant indicating that open ResultSet objects with this holdability will be closed when the current transaction is commited. Moves the cursor froward one row from its current position. Retrieves the value of the designated column in the current row of this ResultSet object as as a stream of two-byte 3 characters.
Retrieves the value of the designated column in the current row of this ResultSet object as a stream of two-byte Unicode characters. Clears all warnings reported on this ResultSet object. Retrieves the current row number. Moves the cursor to the given row number in this ResultSet object.
Moves the cursor a relative number of rows, either positive or negative. Moves the cursor to the previous row in this ResultSet object.
Retrieves the type of this ResultSet object. Retrieves the concurrency mode of this ResultSet object. Retrieves whether the current row has been updated. Retrieves whether the current row has had an insertion. Retrieves whether a row has been deleted. Updates the designated column with a null value. Updates the designated column with a boolean value.
Updates the designated column with a byte value. Updates the designated column with a short value. Updates the designated column with an int value. Updates the designated column with a long value. Connection; import java. DriverManager; import java. Though you can use the isBeforeFirst method to check if ResultSet contains any row or not, it's not guaranteed to be supported in all databases e.
It's simple, elegant, and readable. Date, java. Timestamp, and java. Date in JDBC? Date to java. Date in Java?
If you found this example helpful please share it with your friends and colleagues. I would really appreciate it. Share to Twitter Share to Facebook. Labels: core java interview question , JDBC. This comment has been removed by the author. Thank you again October 10, at AM javin paul said November 29, at AM. Newer Post Older Post Home. Subscribe to: Post Comments Atom. Subscribe for Discounts and Updates Follow. Search This Blog. Interview Questions core java interview question data structure and algorithm 78 Coding Interview Question 75 interview questions 70 design patterns 35 SQL Interview Questions 34 object oriented programming 34 thread interview questions 30 spring interview questions 28 collections interview questions 25 database interview questions 16 servlet interview questions 15 Programming interview question 6 hibernate interview questions 6.
Because of that, you should account for the case and use the returned boolean to guard your access:. From the official documentation which you should have read btw :. Initially the cursor is positioned before the first row. The next method moves the cursor to the next row, and because it returns false when there are no more rows in the ResultSet object, it can be used in a while loop to iterate through the result set. A ResultSet cursor is initially positioned before the first row, the first call to the method next makes the first row the current row, the second call makes the second row the current row, and so on.
There are different types of Executing the Commands. Cursors are used to read the data from your executed queries. When you execute to Read, you using Forward Only Cursor by default hence you are only getting next result after calling Recorset. I don't want to go in much deeper here. The best solution in your case is to use Scalar Resultset which will return only ONE CELL thats exactly what you want to implement without having to loop through your result set.
Following example shows how you can implement such :. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Why is "while rs. Ask Question. Asked 3 years, 3 months ago. Active 3 years, 3 months ago. Viewed 7k times.
Improve this question. Zabuzard Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available. The following method, CoffeesTable. A ResultSet object is a table of data representing a database result set, which is usually generated by executing a statement that queries the database.
For example, the CoffeeTables. You access the data in a ResultSet object through a cursor. Note that this cursor is not a database cursor. This cursor is a pointer that points to one row of data in the ResultSet. Initially, the cursor is positioned before the first row. The method ResultSet. This method returns false if the cursor is positioned after the last row. This method repeatedly calls the ResultSet. The ResultSet interface provides methods for retrieving and manipulating the results of executed queries, and ResultSet objects can have different functionality and characteristics.
These characteristics are type, concurrency, and cursor holdability. The type of a ResultSet object determines the level of its functionality in two areas: the ways in which the cursor can be manipulated, and how concurrent changes made to the underlying data source are reflected by the ResultSet object. The sensitivity of a ResultSet object is determined by one of three different ResultSet types:.
The method DatabaseMetaData. The concurrency of a ResultSet object determines what level of update functionality is supported. The method CoffeesTable. Calling the method Connection. In some cases, however, this may not be the desired behavior. The ResultSet property holdability gives the application control over whether ResultSet objects cursors are closed when commit is called.
The following ResultSet constants may be supplied to the Connection methods createStatement , prepareStatement , and prepareCall :.
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