Ok so basically I have this code:
resultSet = statement.executeQuery("select * from FEEDBACK.COMMENTS");
writeResultSet(resultSet);
private void writeResultSet(ResultSet resultSet) throws SQLException {
System.out.println("jestem w writeresultset");
// resultSet is initialised before the first data set
while (resultSet.next()) {
// it is possible to get the columns via name
// also possible to get the columns via the column number
// which starts at 1
// e.g., resultSet.getSTring(2);
String id = resultSet.getString("id");
String user = resultSet.getString("IMIE");
String website = resultSet.getString("NAZWISKO");
String summary = resultSet.getString("ADRES");
String date = resultSet.getString("EMAIL");
String comment = resultSet.getString("TELEFON");
String opisso = resultSet.getString("OPIS");
JTextField myOutput = new JTextField(1600);
myOutput.setText("id w bazie danych to " + id + " imie to " + user
+ " nazwisko to " + website + " adres to " + summary + " email to "
+ date + " teelefon to " + comment + " opis to " + opisso);
add(myOutput);
}
}
What I want to achieve is this:
resultSet = statement.executeQuery("select * from FEEDBACK.COMMENTS
where NAZWISKO LIKE " variable );
writeResultSet(resultSet);
I want to search by variable which is already defined, however I'm stuck and have no idea how to do it like that.
Use PreparedStatement:
String nazwisko = ...
String query = "select * from FEEDBACK.COMMENTS where NAZWISKO LIKE ?";
PreparedStatement pstmt = con.prepareStatement(query);
pstmt.setString(1, nazwisko);
ResultSet rs = pstmt.execute();
while (resultSet.next()) {
//...
}
In case you need to use a wildcard for your LIKE, choose one of these:
nazwisko = nazwisko + "%";
nazwisko = "%" + nazwisko;
nazwisko = "%" + nazwisko + "%";
up , there are alot weird errors with your code:
like cannot find symbol variable con or incompatible type boolean cannot be converted to resultset.
I have tried this: but there is an error when executing
preparedStatement = connect
.prepareStatement("select * from FEEDBACK.COMMENTS where NAZWISKO= ? ; ");
preparedStatement.setString(1, surname3);
while (resultSet.next()) {
String id = resultSet.getString("i
d");
String user = resultSet.getString("IMIE");
String website = resultSet.getString("NAZWISKO");
String summary = resultSet.getString("ADRES");
String date = resultSet.getString("EMAIL");
String comment = resultSet.getString("TELEFON");
String opisso = resultSet.getString("OPIS");
JTextField myOutput = new JTextField(1600);
myOutput.setText("id w bazie danych to " + id + " imie to " + user + " nazwisko to " + website + " adres to " + summary + " email to " + date + " teelefon to " + comment + " opis to " + opisso);
add(myOutput);
}
error:
the query went fine but , the error appears here "while (resultSet.next())"
SEVERE: null
java.lang.NullPointerException
at jdbcexample.Main.readDataBase(Main.java:416)
at jdbcexample.Main$7.mousePressed(Main.java:346)
Related
This is of course parts of a larger code. It will compile with no problem, but when I call this method I get the error
"syntax error near or at "."" at the position of stmt.executeQuery(SQL).
I would really appreciate the help!
private void Component() {
try {
Statement stmt = con.createStatement();
String SQL = "SELECT component.*, stock.amount_of_component, component.price component.component_type "
+ "FROM component JOIN stock "
+ "ON component.id = stock.component_id "
+ "ORDER BY component.component_type";
ResultSet rs = stmt.executeQuery(SQL);
rs.next();
int id = rs.getInt("ID");
int amount_of_component = rs.getInt("Amount");
String name = rs.getString("Name");
double price = rs.getDouble("Price");
String component_type = rs.getString("Type");
System.out.println(" " + id + amount_of_component + " " + name + " " + price + " " + component_type);
} catch (SQLException err)
{
System.out.println(err.getMessage());
}
}
Typo, missing a comma in the query between component.price and component.component_type :
SELECT component.*, stock.amount_of_component, component.price, component.component_type
FROM component JOIN stock
ON component.id = stock.component_id
ORDER BY component.component_type
Edit: To read the whole result set, put this cycle instead of rs.next()
while(result.next()) {
int id = rs.getInt("ID");
int amount_of_component = rs.getInt("Amount");
String name = rs.getString("Name");
double price = rs.getDouble("Price");
String component_type = rs.getString("Type");
System.out.println(" " + id + amount_of_component + " " + name + " " + price + " " + component_type);
}
Edit2: To print the header, you have to do it manually by putting a System.out.println(" id amount_of_component name price component_type "); before the while.
You missed a comma between 'component.price' and 'component.component_type'
String sql = "SELECT TOP 10 id, Trailer, Block, Location, Day, SetTime, Comment FROM TrailerLocation"
+ " ORDER BY id DESC";
rs = st.executeQuery(sql);
while(rs.next()){
//Retrieve by column name
int id = rs.getInt("id");
String trailer = rs.getString("Trailer");
String block = rs.getString("Block");
String location = rs.getString("Location");
String date = rs.getString("Day");
String comment = rs.getString("Comment");
//Display values
JOptionPane.showMessageDialog(null,
"ID: " + id
+ ", Trailer: " + trailer
+ ", Block: " + block
+ ", Location: " + location
+ ", Date & Time: " + date
+ ", Comment: " + comment);
}
I want the Joptionpane to only display once with all the data not ten times.
You could move the JOptionPane.showMessageDialog(null, ... ) after the while loop.
And, in the while loop, add the informations you want in one unique string which you will display in you JOptionPane.
rs = st.executeQuery(sql);
StringBuilder str = new StringBuilder();
while(rs.next()){
//Retrieve by column name
str.append("ID: " + rs.getInt("id"));
str.append(", Trailer: " + rs.getString("Trailer"));
str.append(", Block: " + rs.getString("Block"));
str.append(", Location: " + rs.getString("Location"));
str.append(", Date: " + rs.getString("Day"));
str.append(", Comment: " + rs.getString("Comment"));
//new line
str.append("\n");
}
JOptionPane.showMessageDialog(null,str.toString());
I am trying to update a table, but it isn't working and giving this sql error.
//Updating Buy Table
Integer stkbid = Integer.parseInt(request.getParameter("stockBid"));
System.out.println("stock buy id : " + stkbid);
//get buy details
PreparedStatement stmtbuy = conn.prepareStatement(
"SELECT \"StockSymbol\", \"Unit\", \"Price\", \"ClearingFee\", \"StampDuty\", \"BrokerFee\"" +
"FROM SPM.\"StockBuy\" WHERE \"StockBuyId\" = '"+ stkbid + "'");
System.out.println("Got stock buy details");
ResultSet rs=stmtbuy.executeQuery();
rs.next();
//String stkcode = rs.getString("StockSymbol");
Integer stkunit = Integer.parseInt(rs.getString("Unit"));
stkunit -= stock.getStockUnit();
Double stkprice = Double.parseDouble(rs.getString("Price"));
Double stkclear = Double.parseDouble(rs.getString("ClearingFee"));
Double stksd = Double.parseDouble(rs.getString("StampDuty"));
Double stkbfee = Double.parseDouble(rs.getString("BrokerFee"));
Double stkval = stkunit * stkprice;
Double stknv = stkval + stkval * (stkclear + stksd + stkbfee);
System.out.println(stknv);
PreparedStatement stmtbuy1 = conn.prepareStatement(
"UPDATE SPM.\"StockBuy\" SET \"Unit\" = " + stkunit + ", \"Value\" = " + stkval + ", \"NetValue\" = " + stknv +
"WHERE \"StockBuyId\" = "+ stkbid);
You are missing a space in before the WHERE clause, which messed up your stknv.
" WHERE \"StockBuyId\" = "+ stkbid);
I think it's an obligation of any poster to remind you that you should use parametrized query. So I shall do the same.
"Please use parametrized query!"
The query that is works has a quote at the end:
" WHERE \"StockBuyId\" = '"+ stkbid + "'");
The one that fails does not
"WHERE \"StockBuyId\" = "+ stkbid);
That might have something to do with it.
I've been getting this ArrayStoreException in my code for loading records from one mysql table to another. I tried truncating the destination table and running my code again and it seems that it encounters the said exception randomly.
I was going to implement a (Spring) JdbcTemplate based DAO when i've encountered an ArrayStoreException during unit testing. I tried to recreate it with ordinary JDBC code and still encounter the error.
For my DDL:
All the columns are of type varchar, except for brthdate and birthdate which are of type Date. DEFAULT CHARSET=utf8
My code snippet:
employeesSql = "select id_no, " +
"lastname, " +
"frstname, " +
"mdlename, " +
"brthdate,sex, " +
"sss_no, " +
"tin_no " +
"from lms.pms_empf " +
"where length(trim(id_no)) > 0 " +
"and id_no <> '000000' " +
" ORDER BY id_no";
employeeSql = "select count(*) "
+ "from dim_employees "
+ "where id_no=?";
updateSql = "update dim_employees " +
"set last_name = ?, " +
"first_name = ?, " +
"middle_name = ?, " +
"birthdate = ?, " +
"sex = ?, " +
"sss_no = ?, " +
"tin_no = ? " +
"where id_no = ?";
insertSql = "insert into dim_employees " +
"(id_no, last_name, first_name, " +
"middle_name,birthdate, sex, sss_no, tin_no) " +
"values (?,?,?,?,?,?,?,?)";
employeesStmt = con.createStatement();
employeeStmt = con.prepareStatement(employeeSql);
updateStmt = con.prepareStatement(updateSql);
insertStmt = con.prepareStatement(insertSql);
employeesCursor = employeesStmt.executeQuery(employeesSql);
while (employeesCursor.next()) {
idNo = new String(employeesCursor.getBytes(1), "UTF-8");
lastName = new String(employeesCursor.getBytes(2), "UTF-8");
firstName = new String(employeesCursor.getBytes(3), "UTF-8");
middleName = new String(employeesCursor.getBytes(4), "UTF-8");
birthDate = employeesCursor.getDate(5);
sex = new String(employeesCursor.getBytes(6), "UTF-8");
sssNo = new String(employeesCursor.getBytes(7), "UTF-8");
tinNo = new String(employeesCursor.getBytes(8), "UTF-8");
employeeStmt.setString(1, idNo);
employeeCursor = employeeStmt.executeQuery();
while (employeeCursor.next()) {
if (employeeCursor.getInt(1) > 0) {
//update
updateStmt.setString(1, lastName);
updateStmt.setString(2, firstName);
updateStmt.setString(3, middleName);
updateStmt.setDate(4, birthDate);
updateStmt.setString(5, sex);
updateStmt.setString(6, sssNo);
updateStmt.setString(7, tinNo);
updateStmt.setString(8, idNo);
updateStmt.executeUpdate();
updateStmt.executeUpdate();
}
else {
//insert
insertStmt.setString(1, idNo);
insertStmt.setString(2,lastName);
insertStmt.setString(3, firstName);
insertStmt.setString(4, middleName);
insertStmt.setDate(5, birthDate);
insertStmt.setString(6, sex);
insertStmt.setString(7, sssNo);
***//exception points here** insertStmt.setString(8, tinNo);
insertStmt.executeUpdate();
insertStmt.clearParameters();
}
}
employeeStmt.clearParameters();
Stack trace:
......
Caused by: java.lang.ArrayStoreException
at java.lang.String.getChars(String.java:854)
at com.mysql.jdbc.PreparedStatement.setString(PreparedStatement.java:4520)
......
at com.vdc.lmsprocs.EmployeeProc.setEmployees(EmployeeProc.java:135)
......
I'm sorry for the long post. I clearly could not explain well enough what happened here. It's the first time i've encountered such a flaw.
Thanks in advance.
while i am finding the data the field of TelephoneNo showing the result in float like 54435435.0.even when i inserted this phone no as 54435435 my code is
String findby =cbfind.getSelectedItem().toString();
if(findby.equals("")){
JOptionPane.showMessageDialog(null," SELECT EITHER REGISTRATION NO OR NAME");
return;
}
if(findby.equals("RegNo"))
{
int regno1= Integer.parseInt(cbregn.getSelectedItem().toString());
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("\n Driver loaded");
Connection con=DriverManager.getConnection("jdbc:odbc:wanisamajDB");
Statement stmt=con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM REGISTRATION1 WHERE RegistrationNo="+regno1);
System.out.println("Hi");
rs.next();
String per = rs.getString("SeniorPerson");
System.out.println("SeniorPerson: " + per );
String reg = rs.getString("RegistrationNo");
System.out.println("RegistrationNo: " + reg);
String nplace = rs.getString("NativePlace");
System.out.println("NativePlace: " + nplace);
String kul = rs.getString("Kul");
System.out.println("Kul: " + kul);
String gtr = rs.getString("Gotra");
System.out.println("Gotra: " + gtr);
String ksami = rs.getString("KulSwami");
System.out.println("KulSwami: " + ksami);
String raddr = rs.getString("ResidensialAddress");
System.out.println("ResidensialAddress: " + raddr);
String code = rs.getString("PinCode");
System.out.println("PinCode: " + code);
String stdcd = rs.getString("STDcode");
System.out.println("STDcode: " + stdcd);
String teleno = rs.getString("TelephoneNo");
System.out.println("TelephoneNo: " + teleno);
String mno = rs.getString("MobileNo");
System.out.println("MobileNo: " + mno);
String email = rs.getString("Email");
System.out.println("Email: " + email);
String web = rs.getString("Website");
System.out.println("Website: " + web);
String educ = rs.getString("Education");
System.out.println("Education: " + educ);
String brch = rs.getString("Branch");
System.out.println("Branch: " + brch);
String bgrp = rs.getString("BloodGroup");
System.out.println("BloodGroup: " + bgrp);
JOptionPane.showMessageDialog(null, "RECORD FOUND");
cbnm.setSelectedItem(per);
tfplace.setText(nplace);
tfkul.setText(kul);
tfgotra.setText(gtr);
tfswami.setText(ksami);
taraddr.setText(raddr);
tfpcd.setText(code);
tfstdcode.setText(stdcd);
tftele.setText(teleno);
tfmno.setText(mno);
tfemail.setText(email);
tfweb.setText(web);
tfedu.setText(educ);
tfbrch.setText(brch);
cbbldgrp.setSelectedItem(bgrp);
}
catch (Exception e)
{
System.out.println("EXCEPTION " + e);
}
}
if(findby.equals("Name"))
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("\n Driver loaded");
Connection con=DriverManager.getConnection("jdbc:odbc:wanisamajDB");
Statement stmt=con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM REGISTRATION1 WHERE SeniorPerson='"+cbnm.getSelectedItem().toString()+"'");
System.out.println("Hi");
rs.next();
String per = rs.getString("SeniorPerson");
System.out.println("SeniorPerson: " + per );
String reg = rs.getString("RegistrationNo");
System.out.println("RegistrationNo: " + reg);
String nplace = rs.getString("NativePlace");
System.out.println("NativePlace: " + nplace);
String kul = rs.getString("Kul");
System.out.println("Kul: " + kul);
String gtr = rs.getString("Gotra");
System.out.println("Gotra: " + gtr);
String ksami = rs.getString("KulSwami");
System.out.println("KulSwami: " + ksami);
String raddr = rs.getString("ResidensialAddress");
System.out.println("ResidensialAddress: " + raddr);
String code = rs.getString("PinCode");
System.out.println("PinCode: " + code);
String stdcd = rs.getString("STDcode");
System.out.println("STDcode: " + stdcd);
String teleno = rs.getString("TelephoneNo");
System.out.println("TelephoneNo: " + teleno);
String mno = rs.getString("MobileNo");
System.out.println("MobileNo: " + mno);
String email = rs.getString("Email");
System.out.println("Email: " + email);
String web = rs.getString("Website");
System.out.println("Website: " + web);
String educ = rs.getString("Education");
System.out.println("Education: " + educ);
String brch = rs.getString("Branch");
System.out.println("Branch: " + brch);
String bgrp = rs.getString("BloodGroup");
System.out.println("BloodGroup: " + bgrp);
JOptionPane.showMessageDialog(null, "RECORD FOUND");
cbregn.setSelectedItem(reg);
tfplace.setText(nplace);
tfkul.setText(kul);
tfgotra.setText(gtr);
tfswami.setText(ksami);
taraddr.setText(raddr);
tfpcd.setText(code);
tfstdcode.setText(stdcd);
tftele.setText(teleno);
tfmno.setText(mno);
tfemail.setText(email);
tfweb.setText(web);
tfedu.setText(educ);
tfbrch.setText(brch);
cbbldgrp.setSelectedItem(bgrp);
}
catch (Exception e)
{
System.out.println("EXCEPTION " + e);
}
}//if
I'm going to wager that it's because that's how it's stored in the DB.
Use varchar rather than whatever it is you're using.
The answer you are seeing is most likely due to:
defining the column type for the telephone number to be "float", "double", "decimal", "numeric" or "real", or
defining the column type as "char", "varchar", etc and populating it from a Java float, double or BigDecimal.
In either case, what you are seeing reflects the data stored in the database.