JDBC. Java Data Base Connec.vity

Transkript

1 JDBC Java Data Base Connec.vity

2

3 Package java.sql

4 Package java.sql Array Blob CallableStatement Clob Connec.on DatabaseMetaData Driver NClob ParameterMetaData PreparedStatement Ref ResultSet ResultSetMetaData RowId Savepoint SQLData SQLInput SQLOutput SQLXML Statement Struct Wrapper

5 Package java.sql Array Blob CallableStatement Clob Connec.on DatabaseMetaData Driver NClob ParameterMetaData PreparedStatement Ref ResultSet ResultSetMetaData RowId Savepoint SQLData SQLInput SQLOutput SQLXML Statement Struct Wrapper

6 Package java.sql 7 klasser i java.sql. Vi trenger én av dem: DriverManager The basic service for managing a set of JDBC drivers Her finner vi metoder som gir oss en forbindelse. DeSe skjer med metoder som returnerer (en peker.l) et objekt av typen Connec.on.

7 DriverManager Her finner vi metoder som gir oss en forbindelse. DeSe skjer med metoder som returnerer (en peker.l) et objekt av typen Connec.on. sta.c Connec.on getconnec.on(string url, Proper.es info)

8 DriverManager Her finner vi metoder som gir oss en forbindelse. DeSe skjer med metoder som returnerer (en peker.l) et objekt av typen Connec.on. sta.c Connec.on getconnec.on(string url, Proper.es info) DriverManager.getConnec.on(url, p);

9 DriverManager.getConnec.on(url, p);

10 DriverManager.getConnec.on(url, p); String url = "jdbc:postgresql://dbpg-ifi-kurs.uio.no/fdb";

11 DriverManager.getConnec.on(url, p); String url = "jdbc:postgresql://dbpg-ifi-kurs.uio.no/fdb"; Properties p = new Properties();

12 DriverManager.getConnec.on(url, p); String url = "jdbc:postgresql://dbpg-ifi-kurs.uio.no/fdb"; Properties p = new Properties(); p.setproperty("ssl", "true");

13 DriverManager.getConnec.on(url, p); String url = "jdbc:postgresql://dbpg-ifi-kurs.uio.no/fdb"; Properties p = new Properties(); p.setproperty("ssl", "true"); p.setproperty("sslfactory", "org.postgresql.ssl.nonvalidatingfactory");

14 DriverManager.getConnec.on(url, p); String url = "jdbc:postgresql://dbpg-ifi-kurs.uio.no/fdb"; Properties p = new Properties(); p.setproperty("ssl", "true"); p.setproperty("sslfactory", "org.postgresql.ssl.nonvalidatingfactory"); p.put("user", "michael");

15 DriverManager.getConnec.on(url, p); String url = "jdbc:postgresql://dbpg-ifi-kurs.uio.no/fdb"; Properties p = new Properties(); p.setproperty("ssl", "true"); p.setproperty("sslfactory", "org.postgresql.ssl.nonvalidatingfactory"); p.put("user", "michael"); p.put("password", passord);

16 DriverManager.getConnec.on(url, p); String url = "jdbc:postgresql://dbpg-ifi-kurs.uio.no/fdb"; Properties p = new Properties(); p.setproperty("ssl", "true"); p.setproperty("sslfactory", "org.postgresql.ssl.nonvalidatingfactory"); p.put("user", "michael"); p.put("password", passord);

17 DriverManager.getConnec.on(url, p); String url = "jdbc:postgresql://dbpg-ifi-kurs.uio.no/fdb"; Properties p = new Properties(); p.setproperty("ssl", "true"); p.setproperty("sslfactory", "org.postgresql.ssl.nonvalidatingfactory"); p.put("user", "michael"); p.put("password", passord); Proper.es p String url "jdbc:postgresql://dbpg-ifi-kurs.uio.no/fdb"

18 DriverManager.getConnec.on(url, p); Klassedatastruktur for klassen DriverManager sta.c Connec.on getconnec.on(string url, Proper.es info) Proper.es p String url "jdbc:postgresql://dbpg-ifi-kurs.uio.no/fdb"

19 Connec.on con = DriverManager.getConnec.on(url, p); Klassedatastruktur for klassen DriverManager sta.c Connec.on getconnec.on(string url, Proper.es info) Proper.es p String url "jdbc:postgresql://dbpg-ifi-kurs.uio.no/fdb"

20 Connec.on Connec.on con = DriverManager.getConnec.on(url, p); Connec.on con

21 DriverManager Her finner vi metoder som gir oss en forbindelse. DeSe skjer med metoder som returnerer (en peker.l) et objekt av typen Connec.on. sta.c Connec.on getconnec.on(string url, Proper.es info)

22 Connec.on public interface Connec.on extends Wrapper, AutoCloseable Connec.on con

23 DriverManager Her finner vi metoder som gir oss en forbindelse. DeSe skjer med metoder som returnerer (en peker.l) et objekt av typen Connec.on. sta.c Connec.on getconnec.on(string url, Proper.es info)

24 Et Connec.on-objekt Connec.on Statement createstatement() con

25 Et Connec.on-objekt Connec.on Statement createstatement() con /* Creates a Statement object for sending SQL statements to the database. */

26 Et Connec.on-objekt Connec.on Statement createstatement() con /* Creates a Statement object for sending SQL statements to the database. */ Statement stm = con.createstatement();

27 Et Connec.on-objekt Connec.on Statement createstatement() con /* Creates a Statement object for sending SQL statements to the database. */ Statement stm = con.createstatement(); Statement stm

28 Et Statement-objekt Statement stm

29 Et Statement-objekt Statement stm

30 Et Statement-objekt ResultSet executequery(string sql) Statement stm Executes the given SQL statement, which returns a single ResultSet object.

31 Et Statement-objekt ResultSet executequery(string sql) Statement stm String spørring = " select F.filmid as fid, F..tle as.sel, F.prodyear as paar from film F natural join Filmcountry C where C.country='Norway " ;

32 Et Statement-objekt ResultSet executequery(string sql) Statement stm String spørring = " select F.filmid as fid, F..tle as.sel, F.prodyear as paar from film F natural join Filmcountry C where C.country='Norway " ; String spørring = "select F.filmid as fid, " +" F.title as tittel, " +" F.prodyear as paar " +"from film F natural join Filmcountry C " +"where C.country='Norway' " ;

33 Et Statement-objekt ResultSet executequery(string sql) Statement stm String spørring = "select F.filmid as fid, " +" F.title as tittel, " +" F.prodyear as paar " +"from film F natural join Filmcountry C " +"where C.country='Norway' " ;

34 Et Statement-objekt ResultSet executequery(string sql) Statement stm String spørring = "select F.filmid as fid, " +" F.title as tittel, " +" F.prodyear as paar " +"from film F natural join Filmcountry C " +"where C.country='Norway' " ; ResultSet norskefilmer = stm.executequery (spørring);

35 Et ResultSet-objekt fid tittel paar Varis Anolit Kvinnen i mitt liv Syx Portrettet Andre omgang Digre daier Stopp Tid for frokost ResultSet norskefilmer ResultSet norskefilmer = stm.executequery (spørring);

36 Et ResultSet-objekt fid tittel paar Varis Anolit Kvinnen i mitt liv Syx Portrettet Andre omgang Digre daier Stopp Tid for frokost ResultSet norskefilmer A table of data represen7ng a database result set, which is usually generated by execu7ng a statement that queries the database. ResultSet norskefilmer = stm.executequery (spørring);

37 Et ResultSet-objekt fid tittel paar Varis Anolit Kvinnen i mitt liv Syx Portrettet Andre omgang Digre daier Stopp Tid for frokost ResultSet norskefilmer A ResultSet object maintains a cursor poin7ng to its current row of data. Ini7ally the cursor is posi7oned before the first row. The next method moves the cursor to the next row, and because it returns false when there are no more rows in the ResultSet object, it can be used in a while loop to iterate through the result set.. ResultSet norskefilmer = stm.executequery (spørring);

38 Et ResultSet-objekt cursor fid tittel paar Varis Anolit Kvinnen i mitt liv Syx Portrettet Andre omgang Digre daier Stopp Tid for frokost ResultSet norskefilmer A ResultSet object maintains a cursor poin7ng to its current row of data. Ini7ally the cursor is posi7oned before the first row. The next method moves the cursor to the next row, and because it returns false when there are no more rows in the ResultSet object, it can be used in a while loop to iterate through the result set.. ResultSet norskefilmer = stm.executequery (spørring);

39 Et ResultSet-objekt cursor fid tittel paar Varis Anolit Kvinnen i mitt liv Syx Portrettet Andre omgang Digre daier Stopp Tid for frokost ResultSet norskefilmer A default ResultSet object is not updatable and has a cursor that moves forward only. Thus, you can iterate through it only once and only from the first row to the last row. It is possible to produce ResultSet objects that are scrollable and/or updatable. ResultSet norskefilmer = stm.executequery (spørring);

40 Et ResultSet-objekt cursor fid tittel paar Varis Anolit Kvinnen i mitt liv Syx Portrettet Andre omgang Digre daier Stopp Tid for frokost boolean next() ResultSet norskefilmer Moves the cursor froward one row from its current posi7on. ResultSet norskefilmer = stm.executequery (spørring);

41 Et ResultSet-objekt cursor fid tittel paar Varis Anolit Kvinnen i mitt liv Syx Portrettet Andre omgang Digre daier Stopp Tid for frokost boolean next() the current row ResultSet norskefilmer Moves the cursor froward one row from its current posi7on. ResultSet norskefilmer = stm.executequery (spørring);

42 Et ResultSet-objekt cursor fid tittel paar Varis Anolit Kvinnen i mitt liv Syx Portrettet Andre omgang Digre daier Stopp Tid for frokost boolean next() the current row ResultSet norskefilmer Moves the cursor froward one row from its current posi7on. ResultSet norskefilmer = stm.executequery (spørring);

43 Et ResultSet-objekt cursor fid tittel paar Varis Anolit Kvinnen i mitt liv Syx Portrettet Andre omgang Digre daier Stopp Tid for frokost boolean next() the current row ResultSet norskefilmer Moves the cursor froward one row from its current posi7on. ResultSet norskefilmer = stm.executequery (spørring);

44 Et ResultSet-objekt cursor fid tittel paar Varis Anolit Kvinnen i mitt liv Syx Portrettet Andre omgang Digre daier Stopp Tid for frokost boolean next() ResultSet norskefilmer Moves the cursor forward one row from its current posi7on. ResultSet norskefilmer = stm.executequery (spørring);

45 Et ResultSet-objekt cursor fid tittel paar Varis Anolit Kvinnen i mitt liv Syx Portrettet Andre omgang Digre daier Stopp Tid for frokost boolean next() String getstring(string columnlabel) int getint(int columnindex) the current row ResultSet norskefilmer Moves the cursor forward one row from its current posi7on. Retrieves the value of the designated column in the current row of this ResultSet object as a String. Retrieves the value of the designated column in the current row of this ResultSet object as an int.

46 cursor fid tittel paar Varis Anolit Kvinnen i mitt liv Syx Portrettet Andre omgang Digre daier Stopp Tid for frokost the current row ResultSet norskefilmer boolean next() String getstring(string columnlabel) int getint(int columnindex) while ( norskefilmer.next() ) { fm = new Film(norskeFilmer.getInt("fid")); fm.tittel = norskefilmer.getstring("tittel"); fm.produksjonsår = norskefilmer.getint("paar"); filmer.add(fm); }

47 Properties p = new Properties(); p.setproperty("ssl", "true"); p.setproperty("sslfactory", "org.postgresql.ssl.nonvalidatingfactory"); p.put("user", "michael"); p.put("password", passord); // "ifikurs_ro"); String url = "jdbc:postgresql://dbpg-ifi-kurs.uio.no/fdb"; Connection con = DriverManager.getConnection(url, p); } Statement stm = con.createstatement(); String spørring = "select F.filmid as fid, " +" F.title as tittel, " +" F.prodyear as paar " +"from film F natural join Filmcountry C " +"where C.country='Norway'" ; ResultSet norskefilmer = stm.executequery (spørring); while (norskefilmer.next() ) { fm = new Film(norskeFilmer.getInt("fid")); fm.tittel = norskefilmer.getstring("tittel"); fm.produksjonsår = norskefilmer.getint("paar"); filmer.add(fm); }