Category: Computer Programming

Java & MySQL – Insert Records Example ”; Previous Next This chapter provides an example on how to insert records in a table using JDBC application. Before executing following example, make sure you have the following in place − To execute the following example you can replace the username and password with your actual user name and password. Your MySQL database you are using is up and running. Required Steps The following steps are required to create a new Database using JDBC application − Import the packages − Requires that you include the packages containing the JDBC classes needed for database programming. Most often, using import java.sql.* will suffice. Register the JDBC driver − Requires that you initialize a driver so you can open a communications channel with the database. 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. Clean up the environment − try with resources automatically closes the resources. Sample Code Copy and paste the following example in TestApplication.java, compile and run as follows − import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.Statement; public class TestApplication { static final String DB_URL = “jdbc:mysql://localhost/TUTORIALSPOINT”; static final String USER = “guest”; static final String PASS = “guest123”; public static void main(String[] args) { // Open a connection try(Connection conn = DriverManager.getConnection(DB_URL, USER, PASS); Statement stmt = conn.createStatement(); ) { // Execute a query System.out.println(“Inserting records into the table…”); String sql = “INSERT INTO Registration VALUES (100, ”Zara”, ”Ali”, 18)”; stmt.executeUpdate(sql); sql = “INSERT INTO Registration VALUES (101, ”Mahnaz”, ”Fatma”, 25)”; stmt.executeUpdate(sql); sql = “INSERT INTO Registration VALUES (102, ”Zaid”, ”Khan”, 30)”; stmt.executeUpdate(sql); sql = “INSERT INTO Registration VALUES(103, ”Sumit”, ”Mittal”, 28)”; stmt.executeUpdate(sql); System.out.println(“Inserted records into the table…”); } catch (SQLException e) { e.printStackTrace(); } } } Now let us compile the above example as follows − C:>javac TestApplication.java C:> When you run TestApplication, it produces the following result − C:>java TestApplication Inserting records into the table… Inserted records into the table… C:> Print Page Previous Next Advertisements ”;

Java & MySQL – Sorting Data Example ”; Previous Next This chapter provides an example on how to sort records from a table using JDBC application. This would use asc and desc keywords to sort records in ascending or descending order. Before executing the following example, make sure you have the following in place − To execute the following example you can replace the username and password with your actual user name and password. Your MySQL database you are using, is up and running. Required Steps The following steps are required to create a new Database using JDBC application − Import the packages − Requires that you include the packages containing the JDBC classes needed for database programming. Most often, using import java.sql.* will suffice. 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 sort records from a table. These Queries make use of asc and desc clauses to sort data in ascending and descening orders. Clean up the environment − try with resources automatically closes the resources. Sample Code Copy and paste the following example in TestApplication.java, compile and run as follows − import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class TestApplication { static final String DB_URL = “jdbc:mysql://localhost/TUTORIALSPOINT”; static final String USER = “guest”; static final String PASS = “guest123”; static final String QUERY = “SELECT id, first, last, age FROM Registration”; public static void main(String[] args) { // Open a connection try(Connection conn = DriverManager.getConnection(DB_URL, USER, PASS); Statement stmt = conn.createStatement();) { System.out.println(“Fetching records in ascending order…”); ResultSet rs = stmt.executeQuery(QUERY + ” ORDER BY first ASC”); while(rs.next()){ //Display values System.out.print(“ID: ” + rs.getInt(“id”)); System.out.print(“, Age: ” + rs.getInt(“age”)); System.out.print(“, First: ” + rs.getString(“first”)); System.out.println(“, Last: ” + rs.getString(“last”)); } System.out.println(“Fetching records in descending order…”); rs = stmt.executeQuery(QUERY + ” ORDER BY first DESC”); while(rs.next()){ //Display values System.out.print(“ID: ” + rs.getInt(“id”)); System.out.print(“, Age: ” + rs.getInt(“age”)); System.out.print(“, First: ” + rs.getString(“first”)); System.out.println(“, Last: ” + rs.getString(“last”)); } rs.close(); } catch (SQLException e) { e.printStackTrace(); } } } Now let us compile the above example as follows − C:>javac TestApplication.java C:> When you run TestApplication, it produces the following result − C:>java TestApplication Fetching records in ascending order… ID: 103, Age: 28, First: Sumit, Last: Mittal ID: 102, Age: 30, First: Zaid, Last: Khan ID: 100, Age: 30, First: Zara, Last: Ali Fetching records in descending order… ID: 100, Age: 30, First: Zara, Last: Ali ID: 102, Age: 30, First: Zaid, Last: Khan ID: 103, Age: 28, First: Sumit, Last: Mittal C:> Print Page Previous Next Advertisements ”;

Java & MySQL – Select Database Example ”; Previous Next This chapter provides an example on how to select a Database using JDBC application. Before executing the following example, make sure you have the following in place − To execute the following example you need to replace the username and password with your actual user name and password. Your MySQL database you are using, is up and running. Required Steps The following steps are required to create a new Database using JDBC application − Import the packages − Requires that you include the packages containing the JDBC classes needed for the database programming. Most often, using import java.sql.* will suffice. Open a connection − Requires using the DriverManager.getConnection() method to create a Connection object, which represents a physical connection with a selected database. Selection of database is made while you prepare database URL. Following example would make connection with STUDENTS database. Clean up the environment − try with resources automatically closes the resources. Sample Code Copy and paste the following example in JDBCExample.java, compile and run as follows − import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.Statement; public class JDBCExample { static final String DB_URL = “jdbc:mysql://localhost/TUTORIALSPOINT”; static final String USER = “guest”; static final String PASS = “guest123”; public static void main(String[] args) { System.out.println(“Connecting to a selected database…”); // Open a connection try(Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);) { System.out.println(“Connected database successfully…”); } catch (SQLException e) { e.printStackTrace(); } } } Now let us compile the above example as follows − C:>javac JDBCExample.java C:> When you run JDBCExample, it produces the following result − C:>java JDBCExample Connecting to a selected database… Connected database successfully… C:> Print Page Previous Next Advertisements ”;

Java & MySQL – Delete Records Example ”; Previous Next This chapter provides an example on how to delete records from a table using JDBC application. Before executing following example, make sure you have the following in place − To execute the following example you can replace the username and password with your actual user name and password. Your MySQL database you are using is up and running. Required Steps The following steps are required to create a new Database using JDBC application − Import the packages − Requires that you include the packages containing the JDBC classes needed for database programming. Most often, using import java.sql.* will suffice. Register the JDBC driver − Requires that you initialize a driver so you can open a communications channel with the database. 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 delete records from a table. This Query makes use of the WHERE clause to delete conditional records. Clean up the environment − try with resources automatically closes the resources. Sample Code Copy and paste the following example in TestApplication.java, compile and run as follows − import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class TestApplication { static final String DB_URL = “jdbc:mysql://localhost/TUTORIALSPOINT”; static final String USER = “guest”; static final String PASS = “guest123”; static final String QUERY = “SELECT id, first, last, age FROM Registration”; public static void main(String[] args) { // Open a connection try(Connection conn = DriverManager.getConnection(DB_URL, USER, PASS); Statement stmt = conn.createStatement(); ) { String sql = “DELETE FROM Registration ” + “WHERE id = 101”; stmt.executeUpdate(sql); ResultSet rs = stmt.executeQuery(QUERY); while(rs.next()){ //Display values System.out.print(“ID: ” + rs.getInt(“id”)); System.out.print(“, Age: ” + rs.getInt(“age”)); System.out.print(“, First: ” + rs.getString(“first”)); System.out.println(“, Last: ” + rs.getString(“last”)); } rs.close(); } catch (SQLException e) { e.printStackTrace(); } } } Now let us compile the above example as follows − C:>javac TestApplication.java C:> When you run TestApplication, it produces the following result − C:>java TestApplication ID: 100, Age: 30, First: Zara, Last: Ali ID: 102, Age: 30, First: Zaid, Last: Khan ID: 103, Age: 28, First: Sumit, Last: Mittal C:> Print Page Previous Next Advertisements ”;

Java & MySQL – Streaming Data ”; Previous Next A PreparedStatement object has the ability to use input and output streams to supply parameter data. This enables you to place entire files into database columns that can hold large values, such as CLOB and BLOB data types. There are following methods, which can be used to stream data − setAsciiStream() − This method is used to supply large ASCII values. setCharacterStream() − This method is used to supply large UNICODE values. setBinaryStream() − This method is used to supply large binary values. The setXXXStream() method requires an extra parameter, the file size, besides the parameter placeholder. This parameter informs the driver how much data should be sent to the database using the stream. This example would create a database table XML_Data and then XML content would be written into this table. Copy and paste the following example in TestApplication.java, compile and run as follows − import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class TestApplication { static final String DB_URL = “jdbc:mysql://localhost/TUTORIALSPOINT”; static final String USER = “guest”; static final String PASS = “guest123”; static final String QUERY = “SELECT Data FROM XML_Data WHERE id=100″; static final String INSERT_QUERY=”INSERT INTO XML_Data VALUES (?,?)”; static final String CREATE_TABLE_QUERY = “CREATE TABLE XML_Data (id INTEGER, Data LONG)”; static final String DROP_TABLE_QUERY = “DROP TABLE XML_Data”; static final String XML_DATA = “<Employee><id>100</id><first>Zara</first><last>Ali</last><Salary>10000</Salary><Dob>18-08-1978</Dob></Employee>”; public static void createXMLTable(Statement stmt) throws SQLException{ System.out.println(“Creating XML_Data table…” ); //Drop table first if it exists. try{ stmt.executeUpdate(DROP_TABLE_QUERY); }catch(SQLException se){ } stmt.executeUpdate(CREATE_TABLE_QUERY); } public static void main(String[] args) { // Open a connection try(Connection conn = DriverManager.getConnection(DB_URL, USER, PASS); Statement stmt = conn.createStatement(); PreparedStatement pstmt = conn.prepareStatement(INSERT_QUERY); ) { createXMLTable(stmt); ByteArrayInputStream bis = new ByteArrayInputStream(XML_DATA.getBytes()); pstmt.setInt(1,100); pstmt.setAsciiStream(2,bis,XML_DATA.getBytes().length); pstmt.execute(); //Close input stream bis.close(); ResultSet rs = stmt.executeQuery(QUERY); // Get the first row if (rs.next ()){ //Retrieve data from input stream InputStream xmlInputStream = rs.getAsciiStream (1); int c; ByteArrayOutputStream bos = new ByteArrayOutputStream(); while (( c = xmlInputStream.read ()) != -1) bos.write(c); //Print results System.out.println(bos.toString()); } // Clean-up environment rs.close(); } catch (SQLException | IOException e) { e.printStackTrace(); } } } Now let us compile the above example as follows − C:>javac TestApplication.java C:> When you run TestApplication, it produces the following result − C:>java TestApplication Creating XML_Data table… <Employee><id>100</id><first>Zara</first><last>Ali</last><Salary>10000</Salary><Dob>18-08-1978</Dob></Employee> C:> Print Page Previous Next Advertisements ”;

Java & MySQL – Update Records Example ”; Previous Next This chapter provides an example on how to update records in a table using JDBC application. Before executing the following example, make sure you have the following in place − To execute the following example you can replace the username and password with your actual user name and password. Your MySQL database you are using is up and running. Required Steps The following steps are required to create a new Database using JDBC application − Import the packages − Requires that you include the packages containing the JDBC classes needed for database programming. Most often, using import java.sql.* will suffice. 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 update records in a table. This Query makes use of IN and WHERE clause to update conditional records. Clean up the environment − try with resources automatically closes the resources. Sample Code Copy and paste the following example in TestApplication.java, compile and run as follows − import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class TestApplication { static final String DB_URL = “jdbc:mysql://localhost/TUTORIALSPOINT”; static final String USER = “guest”; static final String PASS = “guest123”; static final String QUERY = “SELECT id, first, last, age FROM Registration”; public static void main(String[] args) { // Open a connection try(Connection conn = DriverManager.getConnection(DB_URL, USER, PASS); Statement stmt = conn.createStatement(); ) { String sql = “UPDATE Registration ” + “SET age = 30 WHERE id in (100, 101)”; stmt.executeUpdate(sql); ResultSet rs = stmt.executeQuery(QUERY); while(rs.next()){ //Display values System.out.print(“ID: ” + rs.getInt(“id”)); System.out.print(“, Age: ” + rs.getInt(“age”)); System.out.print(“, First: ” + rs.getString(“first”)); System.out.println(“, Last: ” + rs.getString(“last”)); } rs.close(); } catch (SQLException e) { e.printStackTrace(); } } } Now let us compile the above example as follows − C:>javac TestApplication.java C:> When you run TestApplication, it produces the following result − C:>java TestApplication ID: 100, Age: 30, First: Zara, Last: Ali ID: 101, Age: 30, First: Mahnaz, Last: Fatma ID: 102, Age: 30, First: Zaid, Last: Khan ID: 103, Age: 28, First: Sumit, Last: Mittal C:> Print Page Previous Next Advertisements ”;

Java & MySQL – Batching with Statement Object ”; Previous Next Here is a typical sequence of steps to use Batch Processing with Statement Object − Create a Statement object using either createStatement() methods. Set auto-commit to false using setAutoCommit(). Add as many as SQL statements you like into batch using addBatch() method on created statement object. Execute all the SQL statements using executeBatch() method on created statement object. Finally, commit all the changes using commit() method. This sample code has been written based on the environment and database setup done in the previous chapters. Copy and paste the following example in TestApplication.java, compile and run as follows − import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class TestApplication { static final String DB_URL = “jdbc:mysql://localhost/TUTORIALSPOINT”; static final String USER = “guest”; static final String PASS = “guest123”; public static void printResultSet(ResultSet rs) throws SQLException{ // Ensure we start with first row rs.beforeFirst(); while(rs.next()){ // Display values System.out.print(“ID: ” + rs.getInt(“id”)); System.out.print(“, Age: ” + rs.getInt(“age”)); System.out.print(“, First: ” + rs.getString(“first”)); System.out.println(“, Last: ” + rs.getString(“last”)); } System.out.println(); } public static void main(String[] args) { // Open a connection try(Connection conn = DriverManager.getConnection(DB_URL, USER, PASS); Statement stmt = conn.createStatement( ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE) ) { conn.setAutoCommit(false); ResultSet rs = stmt.executeQuery(“Select * from Employees”); printResultSet(rs); // Create SQL statement String SQL = “INSERT INTO Employees (first, last, age) ” + “VALUES(”Zia”, ”Ali”, 30)”; // Add above SQL statement in the batch. stmt.addBatch(SQL); // Create one more SQL statement SQL = “INSERT INTO Employees (first, last, age) ” + “VALUES(”Raj”, ”Kumar”, 35)”; // Add above SQL statement in the batch. stmt.addBatch(SQL); // Create one more SQL statement SQL = “UPDATE Employees SET age = 35 ” + “WHERE id = 7”; // Add above SQL statement in the batch. stmt.addBatch(SQL); // Create an int[] to hold returned values int[] count = stmt.executeBatch(); //Explicitly commit statements to apply changes conn.commit(); rs = stmt.executeQuery(“Select * from Employees”); printResultSet(rs); stmt.close(); rs.close(); } catch (SQLException e) { e.printStackTrace(); } } } Now let us compile the above example as follows − C:>javac TestApplication.java C:> When you run TestApplication, it produces the following result − C:>java TestApplication ID: 1, Age: 23, First: Zara, Last: Ali ID: 2, Age: 30, First: Mahnaz, Last: Fatma ID: 3, Age: 35, First: Zaid, Last: Khan ID: 4, Age: 33, First: Sumit, Last: Mittal ID: 5, Age: 40, First: John, Last: Paul ID: 7, Age: 20, First: Sita, Last: Singh ID: 8, Age: 20, First: Rita, Last: Tez ID: 9, Age: 20, First: Sita, Last: Singh ID: 1, Age: 23, First: Zara, Last: Ali ID: 2, Age: 30, First: Mahnaz, Last: Fatma ID: 3, Age: 35, First: Zaid, Last: Khan ID: 4, Age: 33, First: Sumit, Last: Mittal ID: 5, Age: 40, First: John, Last: Paul ID: 7, Age: 35, First: Sita, Last: Singh ID: 8, Age: 20, First: Rita, Last: Tez ID: 9, Age: 20, First: Sita, Last: Singh ID: 10, Age: 30, First: Zia, Last: Ali ID: 11, Age: 35, First: Raj, Last: Kumar C:> Print Page Previous Next Advertisements ”;

Java & MySQL – Create Table Example ”; Previous Next This chapter provides an example on how to create a table using JDBC application. Before executing the following example, make sure you have the following in place − To execute the following example you can replace the username and password with your actual user name and password. Your MySQL is up and running. Required Steps The following steps are required to create a new Database using JDBC application − Import the packages − Requires that you include the packages containing the JDBC classes needed for database programming. Most often, using import java.sql.* will suffice. 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 create a table in a seleted database. Clean up the environment − try with resources automatically closes the resources. Sample Code Copy and paste the following example in TestApplication.java, compile and run as follows − import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.Statement; public class TestApplication { static final String DB_URL = “jdbc:mysql://localhost/TUTORIALSPOINT”; static final String USER = “guest”; static final String PASS = “guest123”; public static void main(String[] args) { // Open a connection try(Connection conn = DriverManager.getConnection(DB_URL, USER, PASS); Statement stmt = conn.createStatement(); ) { String sql = “CREATE TABLE REGISTRATION ” + “(id INTEGER not NULL, ” + ” first VARCHAR(255), ” + ” last VARCHAR(255), ” + ” age INTEGER, ” + ” PRIMARY KEY ( id ))”; stmt.executeUpdate(sql); System.out.println(“Created table in given database…”); } catch (SQLException e) { e.printStackTrace(); } } } Now let us compile the above example as follows − C:>javac TestApplication.java C:> When you run TestApplication, it produces the following result − C:>java TestApplication Created table in given database… C:> Print Page Previous Next Advertisements ”;

Java & MySQL – Batching with PrepareStatement Object ”; Previous Next Here is a typical sequence of steps to use Batch Processing with PrepareStatement Object − Create SQL statements with placeholders. Create PrepareStatement object using either prepareStatement() methods. Set auto-commit to false using setAutoCommit(). Add as many as SQL statements you like into batch using addBatch() method on created statement object. Execute all the SQL statements using executeBatch() method on created statement object. Finally, commit all the changes using commit() method. This sample code has been written based on the environment and database setup done in the previous chapters. Copy and paste the following example in TestApplication.java, compile and run as follows − import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class TestApplication { static final String DB_URL = “jdbc:mysql://localhost/TUTORIALSPOINT”; static final String USER = “guest”; static final String PASS = “guest123”; static final String INSERT_QUERY = “INSERT INTO Employees(first,last,age) VALUES(?, ?, ?)”; public static void printResultSet(ResultSet rs) throws SQLException{ // Ensure we start with first row rs.beforeFirst(); while(rs.next()){ // Display values System.out.print(“ID: ” + rs.getInt(“id”)); System.out.print(“, Age: ” + rs.getInt(“age”)); System.out.print(“, First: ” + rs.getString(“first”)); System.out.println(“, Last: ” + rs.getString(“last”)); } System.out.println(); } public static void main(String[] args) { // Open a connection try(Connection conn = DriverManager.getConnection(DB_URL, USER, PASS); PreparedStatement stmt = conn.prepareStatement(INSERT_QUERY, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE) ) { conn.setAutoCommit(false); ResultSet rs = stmt.executeQuery(“Select * from Employees”); printResultSet(rs); // Set the variables stmt.setString( 1, “Pappu” ); stmt.setString( 2, “Singh” ); stmt.setInt( 3, 33 ); // Add it to the batch stmt.addBatch(); // Set the variables stmt.setString( 1, “Pawan” ); stmt.setString( 2, “Singh” ); stmt.setInt( 3, 31 ); // Add it to the batch stmt.addBatch(); // Create an int[] to hold returned values int[] count = stmt.executeBatch(); //Explicitly commit statements to apply changes conn.commit(); rs = stmt.executeQuery(“Select * from Employees”); printResultSet(rs); stmt.close(); rs.close(); } catch (SQLException e) { e.printStackTrace(); } } } Now let us compile the above example as follows − C:>javac TestApplication.java C:> When you run TestApplication, it produces the following result − C:>java TestApplication ID: 1, Age: 23, First: Zara, Last: Ali ID: 2, Age: 30, First: Mahnaz, Last: Fatma ID: 3, Age: 35, First: Zaid, Last: Khan ID: 4, Age: 33, First: Sumit, Last: Mittal ID: 5, Age: 40, First: John, Last: Paul ID: 7, Age: 35, First: Sita, Last: Singh ID: 8, Age: 20, First: Rita, Last: Tez ID: 9, Age: 20, First: Sita, Last: Singh ID: 10, Age: 30, First: Zia, Last: Ali ID: 11, Age: 35, First: Raj, Last: Kumar ID: 1, Age: 23, First: Zara, Last: Ali ID: 2, Age: 30, First: Mahnaz, Last: Fatma ID: 3, Age: 35, First: Zaid, Last: Khan ID: 4, Age: 33, First: Sumit, Last: Mittal ID: 5, Age: 40, First: John, Last: Paul ID: 7, Age: 35, First: Sita, Last: Singh ID: 8, Age: 20, First: Rita, Last: Tez ID: 9, Age: 20, First: Sita, Last: Singh ID: 10, Age: 30, First: Zia, Last: Ali ID: 11, Age: 35, First: Raj, Last: Kumar ID: 12, Age: 33, First: Pappu, Last: Singh ID: 13, Age: 31, First: Pawan, Last: Singh C:> Print Page Previous Next Advertisements ”;

Discuss Java & MySQL ”; Previous Next Java based application can connect to MySQL using JDBC API. JDBC works with Java on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. Print Page Previous Next Advertisements ”;