private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
if (evt.getSource() == jButton1) {
String ab = jTextField1.getText();
String bc = jPasswordField1.getText().toString();
String cd = jTextField2.getText();
String de = jTextField3.getText();
PreparedStatement ps1 = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection c = DriverManager.getConnection("jdbc:oracle:thin:#localhost:1521:xe", "system", "hr");
ps = c.prepareStatement("Select User_Name from AdminLogin where Password =?");
ps.setString(1, bc);
rs = ps.executeQuery();
rs.next();
if (ab.equals(rs.getString(1))) {
ps1 = c.prepareStatement("Update AdminLogin SET Date1=?,Time=? WHERE Password=?");
ps1.setString(1, cd);
ps1.setString(2, de);
ps1.setString(3, bc);
int e = ps1.executeUpdate();
JOptionPane.showMessageDialog(this, "Welcome", "Logged In", JOptionPane.INFORMATION_MESSAGE);
//MainMenuAAI mainMenuAAI = new MainMenuAAI();
//setVisible(false);}
} else if (!(ab.equals(rs.getString(1)))) {
JOptionPane.showMessageDialog(this, "<html>YOU ARE NOT A<br>ADMIN</br></html>", "ERROR", JOptionPane.ERROR_MESSAGE);
//AdminLogin admin=new AdminLogin();
//setVisible(false);
}
c.close();
} catch (Exception e) {
System.out.println(e);
}
}// TODO add your handling code here:
}
Everything is working fine in the code. It is executing the code inside
if(ab.equals(rs.getString(1)))
and showing "Welcome" but not d one inside
if(!(ab.equals(rs.getString(1))))
Whenever I enter wrong username or password it shows the error
java.sql.SQLException: Exhausted Resultset
That is correct, because if you enter wrong username or password, NO record will be returned. So, when you use the rs.next(); in this case, it is trying to access the first row of the empty result set! And that is where it is throwing the exception.
You could fix your code like this:
rs = ps.executeQuery();
//rs.next();
int counter=0;
while (rs.next()) {
counter++;
if (ab.equals(rs.getString(1))) {
ps1 = c.prepareStatement("Update AdminLogin SET Date1=?,Time=? WHERE Password=?");
ps1.setString(1, cd);
ps1.setString(2, de);
ps1.setString(3, bc);
int e = ps1.executeUpdate();
JOptionPane.showMessageDialog(this, "Welcome", "Logged In", JOptionPane.INFORMATION_MESSAGE);
//MainMenuAAI mainMenuAAI = new MainMenuAAI();
//setVisible(false);}
}
}
if(counter==0){
JOptionPane.showMessageDialog(this, "<html>YOU ARE NOT A<br>ADMIN</br></html>", "ERROR", JOptionPane.ERROR_MESSAGE);
}
Related
I'm trying to get values from resulset, but it return nothing.
When i'm trying to do it through plain sql it return some values.
List<String> res = new ArrayList<String>();
try {
String query = "SELECT COLUMN_NAME FROM idoc.columns_to_show where user = ? "
+ DAO.DB2_UR_POSTFIX;
Connection connection = Properties.getDocsConnection();
try {
PreparedStatement pr = connection.prepareStatement(query);
try {
pr.setString(1, user.getDomainName());
ResultSet rs = pr.executeQuery();
try {
while (rs.next()) {
res.add(rs.getString("COLUMN_NAME"));
}
} finally {
rs.close();
}
} finally {
pr.close();
}
} finally {
connection.close();
}
} catch (SQLException e) {
throw new RuntimeException(e);
}
return res;
Don't use column name "user" it is reserved name for DB2 database.
Therefore I couldn't find any result.
What is the best way to get the max id of table? Below I have paste the error and code. So I was planning on using afterLast() method to get the max id but I get an error.
ERROR:
SQLException: feature not supported
Code:
public class ex03 {
public static void main(String[] args) {
String url = "jdbc:ucanaccess://C:/Users/dave_000/My_WorkSpace/Eclipse_Workspaces/workspace-jsp/T_01_JDBC_01.accdb";
Connection con;
// Get Max ID
Statement stmt0;
String query0 = "select * from user";
try {
Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
} catch (java.lang.ClassNotFoundException e) {
System.err.print("ClassNotFoundException: ");
System.err.println(e.getMessage());
}
try {
con = DriverManager.getConnection(url, "", "");
stmt0 = con.createStatement();
// Get last ID
ResultSet rs = stmt0.executeQuery(query0);
rs.afterLast();
int maxID = rs.getInt("ID");
System.out.println(maxID);
pstmt1.close();
con.close();
} catch (SQLException ex) {
System.err.println("SQLException: " + ex.getMessage());
}
}
}
It is much more efficient to use SQL to find the maximum value:
select max(id) from user
Run cmd :
./jsvc64/jsvc64 -pidfile ./log/jsvc.pid -outfile ./log/out.txt -errfile ./log/error.txt -Xmx512m -Djava.util.Arrays.useLegacyMergeSort=true -cp :./tools/lib/:./tools/ com.g2us.hbase.cmdlog.monitor.CmdLogHbase ./
SQL :
UPSERT INTO CMDLOG_20130818(game,roleid,otime,logtype,passport,subgame,cmdid,exception,moreinfo,pname_0,pname_1,pname_2) VALUES(?,?,?,?,?,?,?,?,?,?,?,?)
upsert 90000 row data,the exception occored.
How to solve it.
Exception in thread "Thread-0" java.lang.OutOfMemoryError: GC overhead limit exceeded
at java.lang.reflect.Method.copy(Method.java:143)
at java.lang.reflect.ReflectAccess.copyMethod(ReflectAccess.java:118)
at sun.reflect.ReflectionFactory.copyMethod(ReflectionFactory.java:282)
at java.lang.Class.copyMethods(Class.java:2748)
at java.lang.Class.getMethods(Class.java:1410)
at org.apache.hadoop.hbase.ipc.Invocation.<init>(Invocation.java:67)
at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:86)
at $Proxy8.getClosestRowBefore(Unknown Source)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:1019)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:885)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:846)
at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:271)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:211)
at org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:160)
at org.apache.hadoop.hbase.client.MetaScanner.access$000(MetaScanner.java:54)
at org.apache.hadoop.hbase.client.MetaScanner$1.connect(MetaScanner.java:133)
at org.apache.hadoop.hbase.client.MetaScanner$1.connect(MetaScanner.java:130)
at org.apache.hadoop.hbase.client.HConnectionManager.execute(HConnectionManager.java:383)
at org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:130)
at org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:105)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.prefetchRegionCache(HConnectionManager.java:947)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:1002)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:889)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:846)
at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:271)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:263)
at com.salesforce.phoenix.query.HTableFactory$HTableFactoryImpl.getTable(HTableFactory.java:60)
at com.salesforce.phoenix.query.ConnectionQueryServicesImpl.getTable(ConnectionQueryServicesImpl.java:133)
at com.salesforce.phoenix.execute.MutationState.commit(MutationState.java:227)
at com.salesforce.phoenix.jdbc.PhoenixConnection.commit(PhoenixConnection.java:244)
at com.g2us.hbase.phoenix.HBaseHelper.executeUpdate(HBaseHelper.java:62)
at com.g2us.hbase.cmdlog.io.BaseLogPoster.upsertRow(BaseLogPoster.java:153)
I found the problem and fixed it.
the problem that 's preStat define as class field var ,so that call executeQuery() many time no close it ,then OutOfMemoryError.
error code:
public class F{
PreparedStatement preStat = null;
public ResultSet executeQuery(String sql, Object... args) throws Exception {
ResultSet rsResultSet = null;
Connection conn = null;
Statement stat = null;
try {
conn = HBaseUtility.getConnection();
preStat = conn.prepareStatement(sql);
if (args != null) {
for (int i = 0; i < args.length; i++) {
preStat.setObject(i + 1, args[i]);
}
}
rsResultSet = preStat.executeQuery();
} catch (Exception e) {
dispos(conn, stat);
Log.error(Log.DB, "queryerror|", e);
throw new RuntimeException("hbase query error");
} finally {
HBaseUtility.release(conn);
}
return rsResultSet;
}
}
fixed code:
public class F{
public ResultSet executeQuery(String sql, Object... args) throws Exception {
ResultSet rsResultSet = null;
Connection conn = null;
Statement stat = null;
try {
PreparedStatement preStat = null; //this var as a class var ,and no close every query .
conn = HBaseUtility.getConnection();
preStat = conn.prepareStatement(sql);
if (args != null) {
for (int i = 0; i < args.length; i++) {
preStat.setObject(i + 1, args[i]);
}
}
rsResultSet = preStat.executeQuery();
preStat.close(); //must be close.
} catch (Exception e) {
dispos(conn, stat);
Log.error(Log.DB, "queryerror|", e);
throw new RuntimeException("hbase query error");
} finally {
HBaseUtility.release(conn);
}
return rsResultSet;
}
}
My question is very much like Getting the return value of a PL/SQL function via Hibernate
I have a function which does some modifications internally and it returns a value.
The original idea was to do something like this:
protected Integer checkXXX(Long id, Long transId)
throws Exception {
final String sql = "SELECT MYSCHEMA.MYFUNC(" + id + ", "
+ transId + ") FROM DUAL";
final BigDecimal nr = (BigDecimal) this.getHibernateTemplate()
.getSessionFactory().getCurrentSession().createSQLQuery(sql)
.uniqueResult();
return nr.intValue();
}
Unfortunately this doesn't work with Oracle. What is the recommended way to do something like this?
Is there a way to extract declared variables from within my statement?
Hibernate Session provides a doWork() method that gives you direct access to java.sql.Connection. You can then create and use java.sql.CallableStatement to execute your function:
session.doWork(new Work() {
public void execute(Connection connection) throws SQLException {
CallableStatement call = connection.prepareCall("{ ? = call MYSCHEMA.MYFUNC(?,?) }");
call.registerOutParameter( 1, Types.INTEGER ); // or whatever it is
call.setLong(2, id);
call.setLong(3, transId);
call.execute();
int result = call.getInt(1); // propagate this back to enclosing class
}
});
You have the following options:
With a #NamedNativeQuery:
#org.hibernate.annotations.NamedNativeQuery(
name = "fn_my_func",
query = "{ ? = call MYSCHEMA.MYFUNC(?, ?) }",
callable = true,
resultClass = Integer.class
)
Integer result = (Integer) entityManager.createNamedQuery("fn_my_func")
.setParameter(1, 1)
.setParameter(2, 1)
.getSingleResult();
With JDBC API:
Session session = entityManager.unwrap( Session.class );
final AtomicReference<Integer> result =
new AtomicReference<>();
session.doWork( connection -> {
try (CallableStatement function = connection
.prepareCall(
"{ ? = call MYSCHEMA.MYFUNC(?, ?) }"
)
) {
function.registerOutParameter( 1, Types.INTEGER );
function.setInt( 2, 1 );
function.setInt( 3, 1 );
function.execute();
result.set( function.getInt( 1 ) );
}
} );
With a native Oracle query:
Integer result = (Integer) entityManager.createNativeQuery(
"SELECT MYSCHEMA.MYFUNC(:postId, :transId) FROM DUAL")
.setParameter("postId", 1)
.setParameter("transId", 1)
.getSingleResult();
Yes, you do need to use an out parameter. If you use the doWork() method, you'd do something like this:
session.doWork(new Work() {
public void execute(Connection conn) {
CallableStatement stmt = conn.prepareCall("? = call <some function name>(?)");
stmt.registerOutParameter(1, OracleTypes.INTEGER);
stmt.setInt(2, <some value>);
stmt.execute();
Integer outputValue = stmt.getInt(1);
// And then you'd do something with this outputValue
}
});
Alternative code :)
if you want to direct result you can use below code
int result = session.doReturningWork(new ReturningWork<Integer>() {
#Override
public Integer execute(Connection connection) throws SQLException {
CallableStatement call = connection.prepareCall("{ ? = call MYSCHEMA.MYFUNC(?,?) }");
call.registerOutParameter( 1, Types.INTEGER ); // or whatever it is
call.setLong(2, id);
call.setLong(3, transId);
call.execute();
return call.getInt(1); // propagate this back to enclosing class
}
});
http://keyurj.blogspot.com.tr/2012/12/dowork-in-hibernate.html
public static void getThroHibConnTest() throws Exception {
logger.debug("UsersActiion.getThroHibConnTest() | BEG ");
Transaction tx = null;
Connection conn = null;
CallableStatement cs = null;
Session session = HibernateUtil.getInstance().getCurrentSession();
try {
tx = session.beginTransaction();
conn = session.connection();
System.out.println("Connection = "+conn);
if (cs == null)
{
cs =
conn.prepareCall("{ ?=call P_TEST.FN_GETSUM(?,?) }");
}
cs.clearParameters();
cs.registerOutParameter(1,OracleTypes.INTEGER);
cs.setInt(2,1);
cs.setInt(3,2);
cs.execute();
int retInt=cs.getInt(1);
tx.commit();
}catch (Exception ex) {
logger.error("UsersActiion.getThroHibConnTest() | ERROR | " , ex);
if (tx != null && tx.isActive()) {
try {
// Second try catch as the rollback could fail as well
tx.rollback();
} catch (HibernateException e1) {
logger.debug("Error rolling back transaction");
}
// throw again the first exception
throw ex;
}
}finally{
try {
if (cs != null) {
cs.close();
cs = null;
}
if(conn!=null)conn.close();
} catch (Exception ex){;}
}
logger.debug("UsersActiion.getThroHibConnTest() | END ");
}
After batch insert a number of rows, I wish to retrieve the generated keys along with their corresponding inserted rows. how do I do this efficiently? Naively I can use statement.getGeneratedKeys() to query the database for each row based on each generated id, but that seems slow. the code below does a batch insert and then go through all the results in the table, however I don't want to include data that already exists in the table prior to insertion.
is there an alternative?
public static void main(String[] args) throws Exception {
Connection conn = getMySqlConnection();
ResultSet rs = null;
Statement stmt = null;
try {
conn = getMySqlConnection();
stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_UPDATABLE);
conn.setAutoCommit(false);
stmt.addBatch("INSERT INTO survey(id, name) VALUES('11', 'Alex')");
stmt.addBatch("INSERT INTO survey(id, name) VALUES('22', 'Mary')");
stmt.addBatch("INSERT INTO survey(id, name) VALUES('33', 'Bob')");
int[] updateCounts = stmt.executeBatch();
System.out.println(updateCounts);
conn.commit();
rs = stmt.executeQuery("SELECT * FROM survey");
while (rs.next()) {
String id = rs.getString("id");
String name = rs.getString("name");
System.out.println("id="+id +" name="+name);
}
}
catch(BatchUpdateException b) {
System.err.println("SQLException: " + b.getMessage());
System.err.println("SQLState: " + b.getSQLState());
System.err.println("Message: " + b.getMessage());
System.err.println("Vendor error code: " + b.getErrorCode());
System.err.print("Update counts: ");
int [] updateCounts = b.getUpdateCounts();
for (int i = 0; i < updateCounts.length; i++) {
System.err.print(updateCounts[i] + " ");
}
}
catch(SQLException ex) {
System.err.println("SQLException: " + ex.getMessage());
System.err.println("SQLState: " + ex.getSQLState());
System.err.println("Message: " + ex.getMessage());
System.err.println("Vendor error code: " + ex.getErrorCode());
}
catch(Exception e) {
e.printStackTrace();
System.err.println("Exception: " + e.getMessage());
}
finally {
rs.close();
stmt.close();
conn.close();
}
}
You have a list of IDs you are interested in. You can use the 'id in (...,...,)' constraint:
StringBuilder newIds = new StringBuilder();
ResultSet rs = stmt.getGeneratedKeys();
while (rs.next()) {
if (newIds.length() > 0) newIds.append(',');
newIds.append(rs.getInt(1));
}
if (newIds.length() > ) {
rs = stmt.executeQuery("SELECT * FROM survey where id in ("+newIds+")");
...
}