1. Structura bazei de date MS Access

2. Ce face o aplicatie JDBC?
Incarca dinamic driverelele de care este nevoie;
Initiaza conexiunea cu sistemul de gestiunea a bazelor de date;
Defineste contextul tranzactiilor (BEGIN,…, {COMMIT | ROLLBACK}),
Verifica lock-urile;
Genereaza si trimite instructiunele SQL;
Receptioneaza date;
Prelucreaza datele;
Genereaza rezultate si mesajele de eroare;
Decide daca face commit sau roll-back pe tranzactie;
Se deconecteaza de la baza de date (termina sesiunea).

3. Managerul de driver JDBC
Incarca driver-ul necesar pentru comunicatei;
Transfera apelurile de functii JDBC de la apliactia catre driverul corect
Trateaza initializarea JDBC din aplicatie si realizeazaza cateva verificari de eororu rudimentare.

4. SGBD-ul si driverul JDBC
trebuie sa exista un driver specific pentru accesul la SGBDR care:
stabileste conexiunea cu BD
transfera cererile de manipulare a datelor;
accepta rezultatele intoarse de cerere;
transforma tipurile datelor specifice SGBDR in tipuri de date Java si mesajele de eroare.
SGBDR (sistemul de gestiune al bazelor de date relationale):
prelucreaza comenzile de manipulare a datelor si;
intoarce datele.

5. Configurare JDBC in Windows 7/ 64

6. Aplicatia 1
Aplicatia utilizeaza JDBC pentru accesul din Java la o baza de date MS Access. Structura bazei de date este prezentata in slide-ul anterior impreuna cu modalitatea de configurarea a lucrului cu JDBC din W7/64.

7. Aplicatia 1 / 1 import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class cuJDBC {
private static final String accessDBURLPrefix = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=";
private static final String accessDBURLSuffix = ";DriverID=22;READONLY=false}";
//aceasta cale trebuie "adaptata" la locul in care este baza de date MS Access
private static final String filename = "D:\\work\\Curs Master Java\\App\\l13-Database\\PrDb\\test.mdb";
public static Connection getAccessDBConnection(String filename) throws SQLException {
filename = filename.trim();
String databaseURL = accessDBURLPrefix + filename + accessDBURLSuffix;
return DriverManager.getConnection(databaseURL, "", ""); }
public static void afisare(ResultSet resultSet) throws SQLException {
String out="";
for(int i=1;i<=resultSet.getMetaData().getColumnCount();++i)
out+=resultSet.getMetaData().getColumnName(i) + " ";
System.out.println(out);
while(resultSet.next()) {
out="";
out+=resultSet.getString(i) + " ";

8. Aplicatia 1 / 2 public static void main(String[] args) { try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection connection =getAccessDBConnection(filename);
DatabaseMetaData dbMetaData = connection.getMetaData();
String productName = dbMetaData.getDatabaseProductName();
System.out.println("Baza de date: " + productName);
String productVersion = dbMetaData.getDatabaseProductVersion();
System.out.println("Versiune: " + productVersion);
Statement statement = connection.createStatement();
System.out.println("\nSelectie * instructiuni");
String query = "SELECT * FROM Table1";
ResultSet resultSet = statement.executeQuery(query);
afisare(resultSet);
java.sql.Date dataazi =new java.sql.Date(new java.util.Date().getTime());
String ins ="INSERT INTO Table1" + "([program],[instructiune],[parametri],[data],[real]) VALUES('program2','linie','x1=1;x2=2',#"+ dataazi+"#, 1211)";
System.out.println(ins);
statement.executeUpdate(ins);
System.out.println("\nSelectie numai instructiuni program2");
query = "SELECT * FROM Table1 WHERE [program]='program2'";
resultSet = statement.executeQuery(query);
System.out.println("\nSterge linii din Table1");
query = "DELETE * FROM Table1 WHERE [real]=1211";
int rowsEffected= statement.executeUpdate(query);
System.out.println(rowsEffected + " rows effected");

9. Aplicatia 1 / 3 System.out.println("\nActualizare linii din Table1");
query = "UPDATE Table1 SET [real] = WHERE [program] = 'program1'";
rowsEffected = statement.executeUpdate(query);
System.out.println(rowsEffected + " rows effected");
statement.close();
connection.close();
} catch(ClassNotFoundException e) {
System.err.println("Eroare la incarcarea de driver: " + e);
} catch (SQLException e) {
System.err.println("Exceptie SQL: " + e); }

10. Aplicatia 1 / 4 Baza de date: ACCESS Versiune: 2.0
Selectie * instructiuni
ID program instructiune parametri data real
1 program1 linie x1=10,y1=10;x2=20,y2= :00:
2 program1 arc x1=10,y1=20;r= :00:
3 program1 grip open :00:
4 program2 linie x1=1;x2= :00:
5 program2 linie x1=1;x2= :00:
6 program2 linie x1=1;x2= :00:
7 program2 linie x1=1;x2= :00:
8 program2 linie x1=1;x2= :00:
9 program2 linie x1=1;x2= :00:
10 program2 linie x1=1;x2= :00:
11 program2 linie x1=1;x2= :00:
INSERT INTO Table1([program],[instructiune],[parametri],[data],[real]) VALUES('program2','linie','x1=1;x2=2',# #, 1211)
Selectie numai instructiuni program2
32 program2 linie x1=1;x2= :00:
Sterge linii din Table1
1 rows effected
Actualizare linii din Table1
3 rows effected

11. Bibliografie
> Java: course, IDE (JDeveloper), JDK and JRE, JDeveloper labs.
> Getting Started With the JDeveloper IDE