JDBC batch update
JDBC batch update is a collectively called when a
group of SQL statements are executed simultaneously to a database as a
single unit. The batch is sent to the database in a single request using
connection object. The advantage of batch is to reduce the network calls
between the front end application and its database rather than executing
single SQL statement.
Understand with Example
In this Tutorial we want to understand you an example
from JDBC batch update. For this we have a class JDBC Batch Update. Inside the
main method we have the list of following step : Before defining class we need
to import a java.sql package. This
package contains the definition for all the classes which provides network
interface to communicate between front end and back end. Loading a Driver - The next step is to
load a driver, that call a Class.forName( ).This help you in establishing a
connection between the front end -backend of application. The DriverManager.get connection( ) - This method return
you a connection object, that is used to built connection between url and database.
con.setAutoCommit(false)
: This method
return you the disable auto commit.
con.createStatement ( ) : This method return a SQL object. Once your
connection is built between your front end and backend, you can retrieve, update
the record in the database. A connection object is used to send and execute SQL
statement to a backend database.
st.addBatches (update ) : This is used to add the
values of the parameter in the database. This method return you the modify value
in the database using update query in the sql command. The method also shows the
number of rows affected in a table.
executeQuery ( ) :
This method is used to
retrieve the records from the database using select query.
rs.next ( ) : This method return you the next successive
value in the element series.
Finally the println print the updated value of the
element in the command prompt. Incase there is an exception occurred during a
connection between the front end and the backend. The catch block is used, to
handle an exception occurred using printstacktrace( ).
printstacktrace( ):
This method prints a
stack trace for Throw able object on the error output stream
.
JdbcBatchUpdate.java
import java.sql.*;
public class JdbcBatchUpdate {
public static void main(String args[]) {
Connection con = null;
Statement st = null;
ResultSet rs = null;
String url = "jdbc:mysql://localhost:3306/";
String db = "komal";
String driver = "com.mysql.jdbc.Driver";
String user = "root";
String pass = "root";
try {
Class.forName(driver);
con = DriverManager.getConnection(url + db, user, pass);
con.setAutoCommit(false);// Disables auto-commit.
st = con.createStatement();
st.addBatch("update person set cname='Ajay' where id='1'");
st.addBatch("update person set cname='Komal' where id='2'");
st.addBatch("update person set cname='Santosh' where id='3'");
st.executeBatch();
String sql = "select * from person";
rs = st.executeQuery(sql);
System.out.println("No \tName");
while (rs.next()) {
System.out.print(rs.getString(1) + " \t");
System.out.println(rs.getString(2));
}
rs.close();
st.close();
con.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
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Output
No Name
4 Komal
5 Ajay
6 Santosh
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