Develop Reference

How can you get a JTextField to work in a SQLite Select statement?

I am working on a program which will when finished allow the end user to keep track of there sound packs in a database through SQLite. The newest problem I am running into is that I can not get the Select statement to take a JTextField input. The reason that I want to do this is that I already have the text fields linked through the insert method. I have tried switching the variable types in the readAllData method and I am not entirely sure what other way to fix it.
The fields are as follows
PackId
PackName
VendorName
PackValue
what I want to happen is when I hit the Update button I want the data in the database to print out to the console (for now) and I am also going to be adding a select specified records method as well.
Here is the code I do apologize in advance this is a very long project:
public void readAllData() throws SQLException {
Connection conn = DriverManager.getConnection("jdbc:sqlite:packsver3.db");
PreparedStatement ps = null;
ResultSet rs = null;
try {
String sql = "SELECT * FROM packs";
ps = conn.prepareStatement(sql);
rs = ps.executeQuery();
while(rs.next()) {
String PackId = PackId.getText();
String PackName = PackName.getText();
String VendorName = VendorName.getTextField();
String PackValue = rs.getTextField;
System.out.println("All Packs\n");
System.out.println("PackId: " +PackId);
System.out.println("PackName: " +PackName);
System.out.println("VendorName: " +VendorName);
System.out.println("PackValue: " +PackValue+"\n\n");
}
} catch (SQLException e) {
System.out.println(e.toString());
}finally {
try {
assert rs != null;
rs.close();
ps.close();
conn.close();
} catch (SQLException e) {
System.out.println(e.toString());
}
Console Output

i can't add Arabic numbers thru java to oracle 10g

I'm facing a problem with adding Arabic number to oracle 10g database. Arabic words are added successfully but if i add number in my string then numbers are saved as ?? in the database.
I thing i should fix the java code so it can add number cause if i change ?? with Arabic number in oracle SQL developer it's work fine.
Here is a example : 'قبل اكثر من ?? شهر' --> this should be like this 'قبل اكثر من ١٢ شهر'
i have change the database character set and NLS_LANG so oracle could support Arabic.
Please i need help.

this is servlet part.
String PeriodNameList=request.getParameter("PeriodNameList");
DataBaseConnection DataBaseConnection=new DataBaseConnection();
Con = DataBaseConnection.getConnection();
AgendaPeriodesBean AgendaPeriodesBean=null;
String [] SplitedPeriodNameList=PeriodNameList.split(",");
for(int j=0;j<SplitedPeriodNameList.length;j++){
AgendaPeriodesBean=new AgendaPeriodesBean();
AgendaPeriodesBean.setAGENDA_PERIODE_TRANS_NAME(SplitedPeriodNameList[j].trim());
Agenda.AddAgendaPeriodTrans(AgendaPeriodesBean);
j++;
}
DAO Part.
public Integer AddAgendaPeriodTrans(AgendaPeriodesBean Bean) throws UnsupportedEncodingException {
Integer updated = null;
PreparedStatement preparedStatement = null;
StringBuffer query = new StringBuffer();
query.append("INSERT INTO AGENDA_PERIODE_TRANSLATION ( ");
query.append(" AGENDA_PERIODE_TRANS_NAME ");
query.append(" ) ");
query.append(" VALUES (?)");
int counter = 1;
try {
preparedStatement = con.prepareStatement(new String(query));
String str = new String(Bean.getAGENDA_PERIODE_TRANS_NAME().getBytes("8859_1"), "UTF-8");
System.out.println("str : str : "+str);
if (Bean.getAGENDA_PERIODE_TRANS_NAME()!= null) {
preparedStatement.setString(counter++, Bean.getAGENDA_PERIODE_TRANS_NAME());
} else {
preparedStatement.setNull(counter++, Types.NVARCHAR);
}
updated = preparedStatement.executeUpdate();
} catch (SQLException sqlException) {
System.out.println("AddAgendaPeriodTrans : "+sqlException.getMessage());
updated=null;
} finally {
query = null;
try {
if (preparedStatement != null) {
preparedStatement.close();
}
} catch (Exception exception) {
}
}
return updated ;
}

Assign to string instead of resultset for jdbc query

I need to get the output of a jdbc query, but wherever I google, it returns a resultset. But, its just a single row. Here is my query
ResultSet rsLocationId = null;
rsLocationId = stmtLocation.executeQuery("SELECT apmcid FROM userbusinesstoapmc WHERE userbusinessid='"+userBusinessKey+"'");
It should return a single record as a string. How can I convert it? Any ideas would be greatly appreciated.

I suggest you use PreparedStatement and bind the parameter, currently you are vulnerable to SQL Injection attacks.
PreparedStatement ps = null;
ResultSet rs = null;
String result = null;
final String sql = "SELECT apmcid FROM userbusinesstoapmc "
+ "WHERE userbusinessid=?";
try {
ps = conn.prepareStatement(sql);
ps.setString(1, userBusinessKey);
rs = ps.executeQuery();
if (rs.next()) {
result = rs.getString("apmcid");
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (ps != null) {
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

you can try like this
ResultSet rsLocationId = null;String result="";
rsLocationId = stmtLocation.executeQuery("SELECT apmcid FROM userbusinesstoapmc WHERE userbusinessid='"+userBusinessKey+"'");
if(rsLocationId.next())
{
result=rsLocationId.getString('apmcid');
}

Even though your particular query only returns a single column, presumably some CHAR type if you expect the result to be a String, the executeQuery method returns a result set object, not a String object. So, you have to process the result set to get your String data. SpringLearner has provided a good example of how to do this.

Can't populate jtable with mysql "like" statement

I am building an application in which you can save deals to database. I'd like to search deals in my database and populate my jtable with relevant results. I want to query my database on keyrelease event. I know it is not an efficient method but I am curious why I can't get it to work.
Below is a sample code that tries to query a database table with ID and country names. There are only 3 country names that start with "D". Somehow I can get country names printed out but can't get them to populate jtable.
The error -
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException" I can't get ResultSet rs1 into a Object[][] . It works fine if I do System.out.println(rs1.getString("Name")
Below is the code -
private void jTextField1KeyReleased(java.awt.event.KeyEvent evt) {
String columnName[] = new String[] { "Name" };
Object oss[][] = new Object[3][];
ResultSet rs1 = null;
int li = 0;
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
java.sql.Connection con = DriverManager.getConnection(Url, User, Password);
Statement st = con.createStatement();
String query = "SELECT * from unit.cntry WHERE Name LIKE '" + abc.getText() + "%';";
rs1 = st.executeQuery(query);
} catch (Exception e) {}
try {
while (rs1.next()) {
oss[li][0] = rs1.getString("Name");
li++;
}
myTable.setModel(new DefaultTableModel(oss, columnName));
} catch (SQLException ex) {
System.out.println(ex.toString());
} finally {
try {
if (rs1 != null) rs1.close();
} catch (SQLException e) {}
}
}

oss[li] = new Object[1];
oss[li][0] = rs1.getString("Name");
Other data structures might be more appealing.

Getting a specific cell from specific row and column out of MySQL database, jdbc, java

I'm trying to get a specifc customer id out of a MySQL table from a telephone number input from the user to use it to add a new order to that customer id. I'm trying to use a method that creates a list being filled by resultset but I keep being returned nothing, more specificly empty square brackets "[]"
This is the code im using.
if((getCustomerID.getCustomerID(inputContactNumber).toString()).equals("[]")){
JOptionPane.showMessageDialog(null, "Customer phone number does not exist.\nTry again or create new customer.");
return;
} else {
customerID = Integer.parseInt(getCustomerID.getCustomerID(inputContactNumber).toString());
insertOrder.insertOrder(customerID);
}
getCustomerID():
public List<Customer> getCustomerID(String phoneNumber) throws SQLException{
List<Customer> customerList = new ArrayList();
String selectCustomerID = "SELECT idcustomer FROM customer WHERE contactNumber = " + phoneNumber;
try {
MyConnection mc = new MyConnection();
dbConnection = mc.getConnection();
statement = dbConnection.createStatement();
ResultSet rs = statement.executeQuery(selectCustomerID);
while (rs.next()){
int customerID = rs.getInt("idcustomer");
Customer c;
c = new Customer (customerID);
customerList.add(c);
}
}
catch (SQLException e){
System.err.println(e);
return null;
}
finally{
if (statement != null){
statement.close();
}
if (dbConnection != null){
dbConnection.close();
}
}
return customerList;
}//end of getGetCustomerID()
Any input is greatly appreciated
-Edit-
MyConnection()
public class MyConnection {
public Connection connection = null;
public Connection getConnection()
{
System.out.println("---- MySql Connecting ----");
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
System.out.println("Can't find MySQl Driver.");
e.printStackTrace();
}
System.out.println("Driver Registered.");
try {
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/quotedb","root","");
} catch (SQLException e) {
System.out.println("Connection Failed.");
}
if (connection != null) {
System.out.println("Connection Established.");
} else {
System.out.println("Connection Failed.");
}
return connection ;
}

Have you tried executing this query in a SQL Programm? As it looks like simply no result is returned, thus the empty square brackets which is the String equivalent of an empty Array.
toString() on an Array is generally a bad idea, you better use length to determine if the Array is empty. Furthermore it is not clear if the result should be unique or not:
If the function getCustomerID.getCustomerID(inputContactNumber) returns more than one result you try to parse a Int like [3453,3543] which will never be what you want. Instead you should use .get(0) on the Array to retrieve the first element.

Please change your select query to
"SELECT idcustomer FROM customer WHERE contactNumber = '"+phoneNumber+"'"
it will work fine i hope

Change the if condition to:
if(getCustomerID(inputContactNumber) == null || getCustomerID(inputContactNumber).isEmpty()){