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Jdbc Drivers In Java Pdf Free

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MessagePosté le: Sam 15 Oct - 09:14 (2016)    Sujet du message: Jdbc Drivers In Java Pdf Free Répondre en citant

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It supports executing different SQL statements and handling results coming from different data sources.In this section we will try to summarize and list the most important JDBC components that are part of every Java application, all of them will be explained in more detail in the next chapters.First of all, Java applications need to create and establish a connection ao a specific database. Java Interview Questions6. For this purpose, the interface javax.sql.DataSource can be used. These types has different mappings for sql types in real databases.create table cant be named as create statement in context of CRUD. This method establishes a connection to a database.Here is an example of its use: // Create the connection with the default credentials java.sql.Connection conn = DriverManager.getConnection("jdbc:hsqldb:mem:mydb", "SA", "" ); We can register drivers using the method DriverManager.registerDriver().: new org.hsqldb.jdbc.JDBCDriver(); DriverManager.registerDriver( new org.hsqldb.jdbc.JDBCDriver() ); We can also load a driver by calling the Class.forName() method: // Loading the HSQLDB JDBC driver Class.forName( "org.hsqldb.jdbc.JDBCDriver" ); . JDBC contains a mechanism called PreparedStatement with predetermined execution path that provides more efficiency and better use of the resources.Result Sets are the representation used for rows coming out from a query.Stored Procedures are sets of SQL statements grouped together, they can be called by name without the need to call each separately.Transactions are groups of SQL statements. It is called Spring Data JDBC Extensions. First column is not SQL types its JDBC type name. It undoes or reverts all changes done in the current transaction.And here is an example of usage where we can see how to disable the auto commit mode by using the method setAutoCommit(false). TYPESCROLLINSENSITIVE, ResultSet.CONCURUPDATABLE, ResultSet.CLOSECURSORSATCOMMIT ); Using this kind of result sets it is possible to move the cursor in both directions and to update or insert new data into the database using the result set with this purpose.7.

Select Statement. Inserts are supported in JDBC. All changes are committed when calling commit() and current transaction changes are rolled back by using the method rollback(): Class.forName( "com.mysql.jdbc.Driver" ); Connection connect = null; try { // connection to JDBC using mysql driver connect = DriverManager.getConnection( "jdbc:mysql://localhost/countries?" + "user=root&password=root" ); connect.setAutoCommit( false ); System.out.println( "Inserting row for Japan." ); String sql = "INSERT INTO COUNTRIES (NAME,POPULATION) VALUES ('JAPAN', '45000000')"; PreparedStatement insertStmt = connect.prepareStatement( sql ); // insert statement using executeUpdate insertStmt.executeUpdate( sql ); connect.rollback(); System.out.println( "Updating row for Japan." ); // update statement using executeUpdate -> will cause an error, update will not be // executed becaues the row does not exist sql = "UPDATE COUNTRIES SET POPULATION='1000000' WHERE NAME='JAPAN'"; PreparedStatement updateStmt = connect.prepareStatement( sql ); updateStmt.executeUpdate( sql ); connect.commit(); } catch( SQLException ex ) { ex.printStackTrace(); //undoes all changes in current transaction connect.rollback(); } finally { connect.close(); } 11. The last ones are more efficient when executing the same statement several times and provide other benefits that we will list in this tutorial. This is the basic interface that contains all the basic methods like java.sql.Statement.executeQuery(String) or java.sql.Statement.executeUpdate(String).Implementations of this interface are recommended when programmers do not need to execute same query multiple times or when queries and statements do not need to be parameterized. Download 17. Here is an example of its usage: Statement stmt = conn.createStatement( ); String sql = "SELECT NAME, POPULATION FROM COUNTRIES"; ResultSet rs = stmt.executeQuery(sql); int id = rs.getInt(1); if( rs.wasNull( ) ) { id = 0; } 4.

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MessagePosté le: Sam 15 Oct - 09:14 (2016)    Sujet du message: Publicité

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