What is ResultSet in JDBC with example?
What is ResultSet in JDBC with example?
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. viewTable method creates a ResultSet , rs , when it executes the query through the Statement object, stmt .
How does ResultSet work in Java?
A ResultSet is a Java object that contains the results of executing an SQL query. In other words, it contains the rows that satisfy the conditions of the query. The data stored in a ResultSet object is retrieved through a set of get methods that allows access to the various columns of the current row.
How do you add data to a ResultSet?
Procedure
- Call the ResultSet. moveToInsertRow method to create the row that you want to insert. The row is created in a buffer outside the ResultSet.
- Call ResultSet. updateXXX methods to assign values to the row that you want to insert.
- Call ResultSet. insertRow to insert the row into the ResultSet.
Which method is use to insert records in database using JDBC?
Open a connection − Requires using the DriverManager. getConnection() method to create a Connection object, which represents a physical connection with a database server. Execute a query − Requires using an object of type Statement for building and submitting an SQL statement to insert records into a table.
What is RS next () in Java?
The next() method of the ResultSet interface moves the pointer of the current (ResultSet) object to the next row, from the current position. Statement stmt = con. createStatement(); ResultSet rs = stmt. And on calling the next() method for the second time the result set cursor will be moved to the 2nd row.
What is use of isFirst () method?
This isFirst method is specified by the isFirst method in the java. sql. ResultSet interface. If this method is used with forward and dynamic cursors, an exception is thrown.
Is ResultSet empty Java?
The JDBC ResultSet doesn’t provide any isEmpty(), length() or size() method to check if its empty or not. Hence, when a Java programmer needs to determine if ResultSet is empty or not, it just calls the next() method and if next() returns false it means ResultSet is empty.
How can you retrieve data from the ResultSet?
Invoke the Statement. executeQuery method to obtain the result table from the SELECT statement in a ResultSet object. In a loop, position the cursor using the next method, and retrieve data from each column of the current row of the ResultSet object using getXXX methods.
What happens if you call deleteRow () on a ResultSet object?
What happens if you call deleteRow() on a ResultSet object? The row you are positioned on is deleted from the ResultSet, but not from the database.
What is executeUpdate in Java?
The executeUpdate( ) method works just like the execute( ) method, except that it returns an integer value that reports the number of rows affected by the SQL statement. Then, the Statement object’s executeUpdate( ) method is called to execute the SQL DELETE statement, returning the number of rows affected into rslt .
How do you insert in Java?
insert(int offset, char c) method inserts the string representation of the char argument into this sequence. The offset argument must be greater than or equal to 0, and less than or equal to the length of this sequence.
How to update a result set in JDBC?
Following is the example, which makes use of the ResultSet.CONCUR_UPDATABLE and ResultSet.TYPE_SCROLL_INSENSITIVE described in the Result Set tutorial. This example would explain INSERT, UPDATE and DELETE operation on a table. It should be noted that tables you are working on should have Primary Key set properly.
How to get resultset from INSERT statement in Java?
If you’re doing an insert statement, you can use the : Connection.PreparedStatement (String, String []) constructor, and assign those to a ResultSet with ps.getGeneratedKeys ().
How to insert records into a table in JDBC?
Execute a query − Requires using an object of type Statement for building and submitting an SQL statement to insert records into a table. Clean up the environment try with resources automatically closes the resources.
How to update the content of the resultset object?
Using step-2 we can modify the content of ResultSet object and the content of ResultSet object must be updated to the database permanently by calling the following method which is present in ResultSet interface. System.out.println (“1 ROW UPDATED…”);