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JDBC Articles
Page 22 of 22
How to find the current row of a ResultSet object using JDBC?
The getRow() method of the ResultSet class returns the row number at which the ResultSet pointer exists in the current instance.Assume we have a table named cricketers_data with 6 records as shown below:+------------+------------+---------------+----------------+-------------+ | First_Name | Last_Name | Date_Of_Birth | Place_Of_Birth | Country | +------------+------------+---------------+----------------+-------------+ | Shikhar | Dhawan | 1981-12-05 | Delhi | India | | Jonathan | Trott | 1981-04-22 | CapeTown | SouthAfrica | | Lumara | Sangakkara | 1977-10-27 | Matale ...
Read MoreHow to insert a row into a ResultSet object using JDBC?
The insertRow() method of the ResultSet interface inserts a new row into the ResultSet object as well as the table.//Deleting a column from the ResultSet object rs.insertRow();Assume we have a table named cricketers_data with 6 records as shown below:+----+------------+------------+---------------+----------------+-------------+ | ID | First_Name | Last_Name | Year_Of_Birth | Place_Of_Birth | Country | +----+------------+------------+---------------+----------------+-------------+ | 1 | Shikhar | Dhawan | 1981-12-05 | Delhi | India | | 2 | Jonathan | Trott | 1981-04-22 | CapeTown | SouthAfrica | | ...
Read MoreHow to move the pointer of a ResultSet to the default position using JDBC?
The beofreFirst() method of the ResultSet interface moves the cursor/pointer to its default position i.e. before the first record.rs.beforeFirst();Assume we have a table named cricketers_data with 6 records as shown below:+----+------------+------------+---------------+----------------+-------------+ | ID | First_Name | Last_Name | Year_Of_Birth | Place_Of_Birth | Country | +----+------------+------------+---------------+----------------+-------------+ | 1 | Shikhar | Dhawan | 1981-12-05 | Delhi | India | | 2 | Jonathan | Trott | 1981-04-22 | CapeTown | SouthAfrica | | 3 | Lumara | Sangakkara ...
Read MoreHow to move the pointer of a ResultSet to the end of the table using JDBC?
The afterLast() method of the ResultSet interface moves the cursor/pointer after the last row of the ResultSet object.rs.afterLast();Assume we have a table name dataset as shown below:+--------------+-----------+ | mobile_brand | unit_sale | +--------------+-----------+ | Iphone | 3000 | | Samsung | 4000 | | Nokia | 5000 | | Vivo | 1500 | | Oppo | 900 | | MI | 6400 | | MotoG ...
Read MoreHow to get the current value of a particular row from a database using JDBC?
The refreshRow() method of the ResultSet interface refreshes the current row with the most recent value in the database.rs.refreshRow()Assume we have a table named cricketers_data with 7 records as shown below:+----+------------+------------+---------------+----------------+-------------+ | ID | First_Name | Last_Name | Year_Of_Birth | Place_Of_Birth | Country | +----+------------+------------+---------------+----------------+-------------+ | 1 | Shikhar | Dhawan | 1981-12-05 | Delhi | India | | 2 | Jonathan | Trott | 1981-04-22 | CapeTown | SouthAfrica | | 3 | Lumara | Sangakkara | ...
Read MoreHow to retrieve multiple ResultSets from a stored procedure using a JDBC program?
Stored procedures are sub routines, segment of SQL statements which are stored in SQL catalog. All the applications that can access Relational databases (Java, Python, PHP etc.), can access stored procedures.Stored procedures contain IN and OUT parameters or both. They may return result sets in case you use SELECT statements. Stored procedures can return multiple result sets.Retrieving Results from a procedure:You can call an existing stored procedure using the CallableStatement. The prepareCall() method of the Connection interface accepts the procedure call in string format and returns a callable statement object.CallableStatement cstmt = con.prepareCall("{call sampleProcedure()}");Execute the above created callable statement using ...
Read MoreWhat is RowSet? How to retrieve contents of a table using RowSet? Explain?
A RowSet object is similar to ResultSet, it also stores tabular data, in addition to the features of a ResultSet a RowSet follows JavaBeans component model. This can be used as a JavaBeans component in a visual Bean development environment, i.e. in environments like IDE’s you can visually manipulate these properties.Connecting RowSet with databaseThe RowSet interface provides methods to set Java bean properties to connect it to the required database −void setURL(String url):void setUserName(String user_name):void setPassword(String password):PropertiesA RowSet object contains properties and each property have Setter and getter methods. Using these you can set and get values from a command ...
Read MoreIs RowSet Scrollable? Explain with an example?
A RowSet object is similar to ResultSet, it also stores tabular data, in addition to the features of a ResultSet. A RowSet follows the JavaBeans component model.If you Retrieve a ResultSet object by default the cursor of it moves only in forward direction. i.e. you can retrieve the contents of it from first to last.But, in a scrollable result set, the cursor can scroll forward and backward and you can retrieve data backward too.To make ResultSet object scrollable, you need to create one as shown below −Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);Whereas, a RowSet object is Scrollable by default. Therefore, whenever ...
Read MoreWhat is a CachedRowSet in JDBC? Explain?
The CachedRowSet is the base implementation of disconnected row sets. It connects to the data source, reads data from it, disconnects with the data source and the processes the retrieved data, reconnects to the data source and writes the modifications.Creating a CachedRowSetYou can create a Cached RowSet object using the createCachedRowSet() method of the RowSetFactory.You can create a RowSetFactory object using the newfactory() method of the RowSetProvider method.Create a CachedRowSet object using the above-mentioned methods as shown below −//Creating the RowSet object RowSetFactory factory = RowSetProvider.newFactory(); CachedRowSet rowSet = factory.createCachedRowSet();Connecting to the data sourceAfter creating a RowSet object you need ...
Read MoreWhat is the MySQL JDBC driver connection string?
The MySQL JDBC connection string look like this − Class.forName("com.mysql.jdbc.Driver"); Above, Driver is an interface. Whenever your JDBC is running outside an application server, then the class DriverManager establish the connection. The DriverManager class is as follows − conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost/yourdatabaseName",”yourRootName","yourPassword"); Now, I am applying the above connection string to connect Java to MySQL database. The code is as follows. The following is the output that shows that MySQL connection with Java is successful.
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