i'm doing my first applications using JDBC/Oracle... Today i had a problem and i can't find out what's wrong.
That's my code (some parts)
My global variables:
public class Esercizio02_GestioneDB {
public Esercizio02_GestioneDB(){
}
public Connection conn = null;
public Statement s = null;
public ResultSet rs = null;
public ResultSet rs1 = null;
ResultSetMetaData rsmd = null;
ResultSetMetaData rsmd1 = null;
[...]
My connection method:
public void connetti(String user, String pwd) throws ClassNotFoundException, SQLException {
//DRIVER
Class.forName("oracle.jdbc.driver.OracleDriver");
//URL
String url = "jdbc:oracle:thin:@//localhost:1521/xe";
//CONNECTION
conn = DriverManager.getConnection(url, user, pwd);
//AUTOCOMMIT
conn.setAutoCommit(true);
//STATEMENT
s = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
}
So, i have a method to delete a row in a table:
private void eliminaPrenotazione() {
try {
String message1 = "Scegli la prenotazione da cancellare:\n\n";
String query = "SELECT * FROM camere_prenotate";
rs1 = s.executeQuery(query);
rsmd1 = rs1.getMetaData();
message1 += "INDICE ";
for (int i=1; i<=rsmd1.getColumnCount(); i++) {
message1 += rsmd1.getColumnName(i);
message1 += " \t ";
}
message1 += "\n_______________________________\n";
int rowIndex = 1;
String columnType = "";
while (rs1.next()) {
message1 += "["+rowIndex+"]. ";
rowIndex++;
for (int i=1; i<=rsmd1.getColumnCount(); i++) {
columnType = rsmd1.getColumnTypeName(i);
if(columnType.substring(0, 3).equalsIgnoreCase("num")) message1 += rs1.getInt(i);
if(columnType.substring(0, 3).equalsIgnoreCase("var") || columnType.substring(0, 3).equalsIgnoreCase("dat"))
message1 += rs1.getString(i);
message1 += " \t ";
}
message1 +="\n";
}
message1 +="\n";
String scelta = JOptionPane.showInputDialog(null, message1);
int sceltaInt = Integer.parseInt(scelta);
rs1.absolute(sceltaInt);
rs1.deleteRow();
} catch (Exception e) {
JOptionPane.showMessageDialog(null, "Errore: " + e.getMessage());
}
}
deleteRow() returns me an error... it says me that my ResultSet is read only, but in my statement it's delcared as
s = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
so, what's wrong?
sry for the noobish code and the bad english -.-'''
select *
makes the Resultset
instance readonly.
select COLUMNNAME
makes it updatable.