Hi leute,
Ich bin gerade mit einem Projekt beschäftigt. Und zwar ist mein Projekt ein Mp3 player in Java zu erstellen. Ich habe in dem Mp3 Player buttons Check Library,Update Library, Creat Playlist. So wenn ich auf Check Library gehe werden mir alle songs angezeigt.Durch eingeben des Track numbers wird mir der track gelistet.Dort steht dann wie viel mal dieser Track gespielt wurde und was für eine rating er bekommen hat.
Nun aber will ich zu diesem track ein Bild hinzufügen.Also wenn ich wieder den Track number eingebe soll dann wieder : Name des Tracks, diesmal Bild und dann noch wie viel mal er gespielt wurde.
Ich habe das mit dem Blob versucht jedoch bekomme ich hier auch Fehlermeldungen.
Mein Code
Meine Fehlermeldung:
Ich bin gerade mit einem Projekt beschäftigt. Und zwar ist mein Projekt ein Mp3 player in Java zu erstellen. Ich habe in dem Mp3 Player buttons Check Library,Update Library, Creat Playlist. So wenn ich auf Check Library gehe werden mir alle songs angezeigt.Durch eingeben des Track numbers wird mir der track gelistet.Dort steht dann wie viel mal dieser Track gespielt wurde und was für eine rating er bekommen hat.
Nun aber will ich zu diesem track ein Bild hinzufügen.Also wenn ich wieder den Track number eingebe soll dann wieder : Name des Tracks, diesmal Bild und dann noch wie viel mal er gespielt wurde.
Ich habe das mit dem Blob versucht jedoch bekomme ich hier auch Fehlermeldungen.
Mein Code
Code:
import java.sql.*;
import java.io.ObjectOutputStream;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import javax.swing.ImageIcon;
public class LibraryData {
private static Connection connection;
private static Statement stmt;
-----------------------------Das ist die Connection zur datenbank--------------------------------------------------
static {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
// Assumes Library.mdb is in the same folder as LibraryData.class
String sourceURL = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=Library.mdb;";
connection = DriverManager.getConnection(sourceURL, "admin", "");
stmt = connection.createStatement();
} catch (Exception e) {
// shouldn't happen if DB is set up correctly
System.out.println(e);
}
}
------------------------------------------------------------------------------------------------------------------------------
public static String listAll() {
String output = "";
try {
// Need single quote marks ' around the key field in SQL. This is easy to get wrong!
// For instance if key was "04" the SELECT statement would be:
// SELECT * FROM LibraryTable WHERE key = '04'
ResultSet res = stmt.executeQuery("SELECT * FROM LibraryTable");
while (res.next()) { // there is a result
// the name field is the second one in the ResultSet
// Note that with ResultSet we count the fields starting from 1
output += res.getString(1) + " " + " - " + res.getString(4) + " (Played Time) " + res.getString(5) + " - " + res.getString(2) + " - " + res.getString(3) + "\n";
}
} catch (Exception e) {
System.out.println(e);
return null;
}
return output;
}
public static String getName(String key) {
try {
// Need single quote marks ' around the key field in SQL. This is easy to get wrong!
// For instance if key was "04" the SELECT statement would be:
// SELECT * FROM LibraryTable WHERE key = '04'
ResultSet res = stmt.executeQuery("SELECT * FROM LibraryTable WHERE key = '" + key + "'");
if (res.next()) { // there is a result
// the name field is the second one in the ResultSet
// Note that with ResultSet we count the fields starting from 1
return res.getString(2);
} else {
return null;
}
} catch (Exception e) {
System.out.println(e);
return null;
}
}
-------------------------------------------------------------------- Das is der Part mit dem Blob---------------------------------------------------------------
public static String getPicture(String key) {
String sourceURL;
Connection con;
con = DriverManager.getConnection("jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=Library.mdb;");
PreparedStatement ps;
// ich verstehe nicht ganz was ich in den Klammern hineinschreiben muss (name,Photo)+(value(?,?)
ps = con.prepareStatement("insert into Pictrue(name,photo) " + "values(1,dj)");
ps.setString(1, "dj");
Blob blob = con.createBlob();
ImageIcon ii = new ImageIcon("dj.gif");
ObjectOutputStream oos;
oos = new ObjectOutputStream(blob.setBinaryStream(1));
oos.writeObject(ii);
oos.close();
ps.setBlob(2, blob);
ps.execute();
blob.free();
ps.close();
}
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------
public static String getArtist(String key) {
// Similar to getName - use res.getString(3). If no result, return null
try {
// Need single quote marks ' around the key field in SQL. This is easy to get wrong!
// For instance if key was "04" the SELECT statement would be:
// SELECT * FROM LibraryTable WHERE key = '04'
ResultSet res = stmt.executeQuery("SELECT * FROM LibraryTable WHERE key = '" + key + "'");
if (res.next()) { // there is a result
// the name field is the second one in the ResultSet
// Note that with ResultSet we count the fields starting from 1
return res.getString(3);
} else {
return null;
}
} catch (Exception e) {
System.out.println(e);
return null;
}
}
public static int getRating(String key) {
// Similar to getName - use res.getInt(4). If no result, return -1
//return -1;
try {
// Need single quote marks ' around the key field in SQL. This is easy to get wrong!
// For instance if key was "04" the SELECT statement would be:
// SELECT * FROM LibraryTable WHERE key = '04'
ResultSet res = stmt.executeQuery("SELECT * FROM LibraryTable WHERE key = '" + key +"'" );
if (res.next()) { // there is a result
// the name field is the second one in the ResultSet
// Note that with ResultSet we count the fields starting from 1
return res.getInt(4);
} else {
return -1;
}
} catch (Exception e) {
System.out.println(e);
return -1;
}
}
public static int getPlayCount(String key) {
// Similar to getName - use res.getInt(5). If no result, return -1
//return -1;
try {
// Need single quote marks ' around the key field in SQL. This is easy to get wrong!
// For instance if key was "04" the SELECT statement would be:
// SELECT * FROM LibraryTable WHERE key = '04'
ResultSet res = stmt.executeQuery("SELECT * FROM LibraryTable WHERE key = '" + key + "'");
if (res.next()) { // there is a result
// the name field is the second one in the ResultSet
// Note that with ResultSet we count the fields starting from 1
return res.getInt(5);
} else {
return +1;
}
} catch (Exception e) {
System.out.println(e);
return +1;
}
}
public static void setRating(String key, int rating) {
// SQL UPDATE statement required. For instance if rating is 5 and key is "04" then updateStr is
// UPDATE Libary SET rating = 5 WHERE key = '04'
String updateStr = ("UPDATE LibraryTable SET rating = " + rating + " WHERE key = '" + key + "'" );
//System.out.println(updateStr);
try {
stmt.executeUpdate(updateStr);
} catch (Exception e) {
System.out.println(e);
}
}
public static void incrementPlayCount(String key) {
int playCount = getPlayCount(key) + 1;
// SQL UPDATE statement required. For instance if rating is 5 and key is "04" then updateStr is
// UPDATE Libary SET rating = 5 WHERE key = '04'
String updateStr = "UPDATE LibraryTable SET playCount = " + playCount + " WHERE key = '" + key + "'";
//System.out.println(updateStr);
try {
stmt.executeUpdate(updateStr);
} catch (Exception e) {
System.out.println(e);
}
// Similar to setRating - but must getPlayCount first and increment by 1
}
// close the database
public static void close() {
try {
connection.close();
} catch (Exception e) {
// this shouldn't happen
System.out.println(e);
}
}
private String stars(int Rating) {
String stars = "";
// line 77-79 for loop assigning a control variable to a starting value
// the test is carried out prior to any execution of the loop
// it increments the control variable by 1
for (int i = 0; i < Rating; ++i) {
stars += "*";
}
// line 81 returns the value
return stars;
}
}Meine Fehlermeldung:
Code:
---------- Javac ----------
LibraryData.java:77: cannot find symbol
symbol : method getConnection(java.sql.Connection,java.lang.String)
location: class java.sql.DriverManager
con = DriverManager.getConnection(con, "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=Library.mdb;");
^
1 error
Output completed (0 sec consumed) - Normal Termination
Zuletzt bearbeitet:
dbc: Driver={Microsoft Access Driver (*.mdb)};DBQ=Library.mdb;";
