What comments can be added to this code? package attendance; import java.sql.ResultSet; import java.sql.SQLException; import javafx.collections.FXCollections; import javafx.collections.ObservableList; public class RFIDTagsDB { privateSqliteDB db; privatestaticObservableList dbData; publicRFIDTagsDB() throwsClassNotFoundException{ db = new SqliteDB(); dbData = FXCollections.observableArrayList(); } publicObservableListgetDBData(){ return dbData; } publicvoidreadOne(intid) { System.out.println("READ One"); try { this.db.stmt =this.db.conn.createStatement(); System.out.println(db.stmt); String sql ="SELECT * FROM RFIDTags " +"WHERE id = "+ id +""; System.out.println(sql); ResultSet rs =this.db.stmt.executeQuery(sql); while( rs.next() ) { dbData.add( newRFID( rs.getInt("id"), rs.getString("content"), rs.getString("status") ) ); } }catch(Exception e) { System.out.println("Read, Error: "+ e.getMessage()); } } publicvoidread() { System.out.println("READ"); try { this.db.stmt =this.db.conn.createStatement(); System.out.println(db.stmt); String sql ="SELECT * FROM RFIDTags"; System.out.println(sql); ResultSet rs =this.db.stmt.executeQuery(sql); System.out.println(rs); while( rs.next() ) { dbData.add( newRFID( rs.getInt("id"), rs.getString("content"), rs.getString("status") ) ); } }catch(Exception e) { System.out.println("Read, Error: "+ e.getMessage()); } } publicvoidadd(RFIDrfid) throwsSQLException{ try { String sql ="INSERT INTO RFIDTags(content, status) " +"SELECT '"+ rfid.getContent() +"', '"+ rfid.getStatus() +"' " +"WHERE NOT EXISTS(" +"SELECT content " +"FROM RFIDTags " +"WHERE content = '"+ rfid.getContent() +"' " +")"; db.executeQuery(sql); }catch(Exception e) { System.out.println("Add, Error: "+ e.getMessage() ); } } publicvoidmodify(RFIDrfid) { System.out.println(rfid.getId() +" - "+ rfid.getContent() +" - "+ rfid.getStatus() ); try { String sql ="UPDATE RFIDTags " +"SET " +"content = '"+ rfid.getContent() +"', " +"status = '"+ rfid.getStatus() +"' " +"WHERE " +" id = '"+ rfid.getId()+"'"; db.executeQuery(sql); }catch(Exception e) { System.out.println("Modify, Error: "+ e.getMessage()); } } publicvoidremove(RFIDrfid) { try { String sql ="DELETE FROM RFIDTags " +"WHERE id = '"+ rfid.getId() +"'"; db.executeQuery(sql); }catch(Exception e) { System.out.println("Remove, Error: "+ e.getMessage()); } } publicintgetLastInsertedId() throwsSQLException { ResultSet rs = db.stmt.getGeneratedKeys(); if( rs.next() ) { return rs.getInt(1); } return-1; } publicvoidclose() { this.db.closeConnection(); } }
What comments can be added to this code? package attendance; import java.sql.ResultSet; import java.sql.SQLException; import javafx.collections.FXCollections; import javafx.collections.ObservableList; public class RFIDTagsDB { privateSqliteDB db; privatestaticObservableList dbData; publicRFIDTagsDB() throwsClassNotFoundException{ db = new SqliteDB(); dbData = FXCollections.observableArrayList(); } publicObservableListgetDBData(){ return dbData; } publicvoidreadOne(intid) { System.out.println("READ One"); try { this.db.stmt =this.db.conn.createStatement(); System.out.println(db.stmt); String sql ="SELECT * FROM RFIDTags " +"WHERE id = "+ id +""; System.out.println(sql); ResultSet rs =this.db.stmt.executeQuery(sql); while( rs.next() ) { dbData.add( newRFID( rs.getInt("id"), rs.getString("content"), rs.getString("status") ) ); } }catch(Exception e) { System.out.println("Read, Error: "+ e.getMessage()); } } publicvoidread() { System.out.println("READ"); try { this.db.stmt =this.db.conn.createStatement(); System.out.println(db.stmt); String sql ="SELECT * FROM RFIDTags"; System.out.println(sql); ResultSet rs =this.db.stmt.executeQuery(sql); System.out.println(rs); while( rs.next() ) { dbData.add( newRFID( rs.getInt("id"), rs.getString("content"), rs.getString("status") ) ); } }catch(Exception e) { System.out.println("Read, Error: "+ e.getMessage()); } } publicvoidadd(RFIDrfid) throwsSQLException{ try { String sql ="INSERT INTO RFIDTags(content, status) " +"SELECT '"+ rfid.getContent() +"', '"+ rfid.getStatus() +"' " +"WHERE NOT EXISTS(" +"SELECT content " +"FROM RFIDTags " +"WHERE content = '"+ rfid.getContent() +"' " +")"; db.executeQuery(sql); }catch(Exception e) { System.out.println("Add, Error: "+ e.getMessage() ); } } publicvoidmodify(RFIDrfid) { System.out.println(rfid.getId() +" - "+ rfid.getContent() +" - "+ rfid.getStatus() ); try { String sql ="UPDATE RFIDTags " +"SET " +"content = '"+ rfid.getContent() +"', " +"status = '"+ rfid.getStatus() +"' " +"WHERE " +" id = '"+ rfid.getId()+"'"; db.executeQuery(sql); }catch(Exception e) { System.out.println("Modify, Error: "+ e.getMessage()); } } publicvoidremove(RFIDrfid) { try { String sql ="DELETE FROM RFIDTags " +"WHERE id = '"+ rfid.getId() +"'"; db.executeQuery(sql); }catch(Exception e) { System.out.println("Remove, Error: "+ e.getMessage()); } } publicintgetLastInsertedId() throwsSQLException { ResultSet rs = db.stmt.getGeneratedKeys(); if( rs.next() ) { return rs.getInt(1); } return-1; } publicvoidclose() { this.db.closeConnection(); } }
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
Related questions
Question
What comments can be added to this code?
package attendance; | |
import java.sql.ResultSet; | |
import java.sql.SQLException; | |
import javafx.collections.FXCollections; | |
import javafx.collections.ObservableList; | |
public class RFIDTagsDB { | |
privateSqliteDB db; | |
privatestaticObservableList<RFID> dbData; | |
publicRFIDTagsDB() throwsClassNotFoundException{ | |
db = new SqliteDB(); | |
dbData = FXCollections.observableArrayList(); | |
} | |
publicObservableList<RFID>getDBData(){ | |
return dbData; | |
} | |
publicvoidreadOne(intid) { | |
System.out.println("READ One"); | |
try { | |
this.db.stmt =this.db.conn.createStatement(); | |
System.out.println(db.stmt); | |
String sql ="SELECT * FROM RFIDTags " | |
+"WHERE id = "+ id +""; | |
System.out.println(sql); | |
ResultSet rs =this.db.stmt.executeQuery(sql); | |
while( rs.next() ) { | |
dbData.add( | |
newRFID( | |
rs.getInt("id"), | |
rs.getString("content"), | |
rs.getString("status") | |
) | |
); | |
} | |
}catch(Exception e) { | |
System.out.println("Read, Error: "+ e.getMessage()); | |
} | |
} | |
publicvoidread() { | |
System.out.println("READ"); | |
try { | |
this.db.stmt =this.db.conn.createStatement(); | |
System.out.println(db.stmt); | |
String sql ="SELECT * FROM RFIDTags"; | |
System.out.println(sql); | |
ResultSet rs =this.db.stmt.executeQuery(sql); | |
System.out.println(rs); | |
while( rs.next() ) { | |
dbData.add( | |
newRFID( | |
rs.getInt("id"), | |
rs.getString("content"), | |
rs.getString("status") | |
) | |
); | |
} | |
}catch(Exception e) { | |
System.out.println("Read, Error: "+ e.getMessage()); | |
} | |
} | |
publicvoidadd(RFIDrfid) throwsSQLException{ | |
try { | |
String sql ="INSERT INTO RFIDTags(content, status) " | |
+"SELECT '"+ rfid.getContent() +"', '"+ rfid.getStatus() +"' " | |
+"WHERE NOT EXISTS(" | |
+"SELECT content " | |
+"FROM RFIDTags " | |
+"WHERE content = '"+ rfid.getContent() +"' " | |
+")"; | |
db.executeQuery(sql); | |
}catch(Exception e) { | |
System.out.println("Add, Error: "+ e.getMessage() ); | |
} | |
} | |
publicvoidmodify(RFIDrfid) { | |
System.out.println(rfid.getId() +" - "+ rfid.getContent() +" - "+ rfid.getStatus() ); | |
try { | |
String sql ="UPDATE RFIDTags " | |
+"SET " | |
+"content = '"+ rfid.getContent() +"', " | |
+"status = '"+ rfid.getStatus() +"' " | |
+"WHERE " | |
+" id = '"+ rfid.getId()+"'"; | |
db.executeQuery(sql); | |
}catch(Exception e) { | |
System.out.println("Modify, Error: "+ e.getMessage()); | |
} | |
} | |
publicvoidremove(RFIDrfid) { | |
try { | |
String sql ="DELETE FROM RFIDTags " | |
+"WHERE id = '"+ rfid.getId() +"'"; | |
db.executeQuery(sql); | |
}catch(Exception e) { | |
System.out.println("Remove, Error: "+ e.getMessage()); | |
} | |
} | |
publicintgetLastInsertedId() throwsSQLException { | |
ResultSet rs = db.stmt.getGeneratedKeys(); | |
if( rs.next() ) { | |
return rs.getInt(1); | |
} | |
return-1; | |
} | |
publicvoidclose() { | |
this.db.closeConnection(); | |
} | |
} |
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