I have been trying to insert data into DB using prepared statement but not able to run stmt.executeUpdate() The query will insert the field from the array which is declared below,The statement will set the values from the array.
long[] array = new long[100];
int[] devreg = new int[10];
int count = 0, index = 0;
try
{
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(Constants.DB_URL, Constants.USER, Constants.PASS);
// LogMgr.dblogger.info(name +" : Database connection established"); //connection passed
}
catch (Exception e)
{
LogMgr.dblogger.info("Cannot connect to database" + e.toString()); //connection failure
}
if (conn != null) //if connection passed or available
{ //checking device registration
String InsertQuery = " INSERT INTO `acc_dev_db`.`widhb` (`name`,`age`, `type`) VALUES ";
int needacomma = 0;
for (int i=0; i< noofMsg; i++)
{
long empid = array[(i*indexlength)+1];
try
{
Statement s = conn.createStatement ();
s.executeQuery ("SELECT `empid` FROM `acc_dev_db`.`ID` WHERE `widevid` = "+empid+";");
ResultSet rs = s.getResultSet ();
if (rs.next())
{
devstatus = true;
if(needacomma>0)
{
InsertQuery = InsertQuery + ",";
}
InsertQuery = InsertQuery + "(?,?,?,?)";
needacomma += 1;
devreg[j] = i;
j++;
LogMgr.dblogger.info("ID found registered : " + empid); //found device id in the device table. Known device
}
else
{
LogMgr.dblogger.info("ID found not registered : " + empid);
}
rs.close ();
s.close ();
}
catch (Exception e) {
LogMgr.dblogger.info("Database reading error \n" + e.toString() ); //database reading error
}
}
if (devstatus == true) //if device is registered or known device
{
InsertQuery = InsertQuery + ";";
java.sql.PreparedStatement stmt = conn.prepareStatement(InsertQuery);
int loc = 1;
for (count = 0;count < j; count++)
{
int position = (indexlength*devreg[count]);
stmt.setLong(loc, array[position]);
System.out.println( array[position]);
stmt.setDouble(loc + 1, array[position + 1]);
System.out.println( array[position+1]);
stmt.setTimestamp(loc + 2,dateconvert(2, array[position + 2]));
System.out.println( array[position+2]);
stmt.setLong(loc + 3, array[position + 3]);
System.out.println( array[position+3]);
loc += 4;
}
LogMgr.jmslogger.info(stmt.toString());
try{
stmt.executeUpdate();
LogMgr.dblogger.info(name +" : studentdata update successfull from dev : " + devaddress);
}
catch(SQLException e){
System.out.println("EXCEPTION MAN!!!");
}
conn.close ();
}
Current O/P:
12355419
3740073994
491504582
43690
EXCEPTION MAN!!!
You Should throw SqlException or use try-catch block and for manage SqlException
Related
I'm trying to send an increase count variable of a picture (which is increased by just increasing +1 everytime a new session hits a picture). I'm getting the following error message however, i'm checking for an empty result set. My thought process is that I can try to select the picturesNo that has been called and if it can't find that pictureNo we simply insert the first count to the table, and if it can find it, we then update this.
Error message:
"SQLException: Illegal operation on empty result set."
Code to increase the count for the session
HttpSession session = request.getSession() ;
Integer counter = (Integer) session.getAttribute("counter");
String accCount = (String) session.getAttribute("attributeKey") ;
String url = "http://localhost:8080/techfore";
String encodedURL = url + ";jsessionid=" + request.getSession().getId();
if (accCount == null || encodedURL == null) { // New session?
response.sendRedirect("/techfore/WelcomePage");
}
else{
if(counter == 0) {
counter = new Integer(counter.intValue() + 1);
session.setAttribute("counter", counter);
}
}
Utilities.initalCount(out, pictureName, counter);
Code to run the queries
public static void initalCount(PrintWriter out, String pictureName, int accessCount) {
Connection con = null;
try { // Connect to the database
con = openConnection(out);
}
catch (Exception e) { // Failed to open the connection
out.println("<P>" + e.getMessage());
}
try {
Statement stmt = con.createStatement();
String query0;
ResultSet rs1;
query0="SELECT PictureNo FROM Statistics WHERE PictureNo = (SELECT PictureNo FROM Pictures WHERE ShortName = '"+pictureName+"')";
rs1 = stmt.executeQuery(query0);
if(rs1.next()){
//yes exist
String description = rs1.getString("Description");
int pictureNo = rs1.getInt("PictureNo");
IncreaseCount(out, pictureNo, accessCount);
}
else {
//if rs is null insert
int pictureNo = rs1.getInt("PictureNo");
AddCount(out, pictureNo, accessCount);
}
stmt.close() ;
}
catch(SQLException ex) {
out.println("<P>SQLException: " + ex.getMessage()) ;
}
}
public static void AddCount(PrintWriter out, int pictureNo, int accessCount) {
Connection con = null;
try { // Connect to the database
con = openConnection(out);
}
catch (Exception e) { // Failed to open the connection
out.println("<P>" + e.getMessage());
return;
}
try {
Statement stmt = con.createStatement();
String query;
ResultSet rs1;
query="INSERT INTO Statistics VALUES "+pictureNo+","+accessCount+" ";
stmt.executeUpdate(query);
stmt.close() ;
}
catch(SQLException ex) {
out.println("<P>SQLException: " + ex.getMessage()) ;
}
}
public static void IncreaseCount(PrintWriter out, int pictureNo, int accessCount) {
Connection con = null;
try { // Connect to the database
con = openConnection(out);
}
catch (Exception e) { // Failed to open the connection
out.println("<P>" + e.getMessage());
return;
}
try {
Statement stmt = con.createStatement();
String query;
ResultSet rs1;
query="UPDATE Statistics SET AccessCount = "+accessCount+" + 1 WHERE PictureNo = "+pictureNo+"";
stmt.executeUpdate(query);
stmt.close() ;
}
catch(SQLException ex) {
out.println("<P>SQLException: " + ex.getMessage()) ;
}
}
New insert
query="INSERT INTO Statistics VALUES (SELECT PictureNo FROM Pictures WHERE FileName = '"+pictureName+"'),"+accessCount+" ";
I'm making some programme for checking approaches scales for different usernames. When I call function DodajObrisiPristupe(table, comboBox), it says database locked. I searched for solutions and all says that it's probably that I didn't close connection somewhere, but I can't find where. Can anyone please help me?
public void DodajObrisiPristupe(JTable tabela, JComboBox<String> korisnickoime)
{
DefaultTableModel model = (DefaultTableModel)tabela.getModel();
for (int i = 0; i < model.getRowCount(); i++)
{
String serijskibroj = model.getValueAt(i, 2).toString();
boolean pristup = (Boolean)model.getValueAt(i, 4);
if(ProveriDaLiPostojiPristup(serijskibroj, korisnickoime.getSelectedItem().toString()) == true)
{
if(pristup == false)
ObrisiPristup(serijskibroj, korisnickoime.getSelectedItem().toString());
}
else
{
if(pristup == true)
DodajPristup(serijskibroj, korisnickoime.getSelectedItem().toString());
}
}
}
public boolean ProveriDaLiPostojiPristup(String serijskibroj, String korisnickoime)
{
Connection c = null;
Statement stmt = null;
try {
Class.forName("org.sqlite.JDBC");
c = DriverManager.getConnection("jdbc:sqlite:" + naziv + ".db");
stmt = c.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM PRISTUPI;");
while(rs.next())
{
if(Decrypt(rs.getString("korisnickoime")).equals(korisnickoime) && Decrypt(rs.getString("vage")).equals(serijskibroj))
return true;
}
rs.close();
stmt.close();
c.close();
}
catch ( Exception e ) {
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
System.exit(0);
}
return false;
}
public void DodajPristup(String serijskibroj, String korisnickoime)
{
Connection c = null;
Statement stmt = null;
try {
Class.forName("org.sqlite.JDBC");
c = DriverManager.getConnection("jdbc:sqlite:" + naziv + ".db");
stmt = c.createStatement();
String sql = "INSERT INTO PRISTUPI (KORISNICKOIME,VAGE) " +
"VALUES ('" + Encrypt(korisnickoime) + "', '" + Encrypt(serijskibroj) + "');";
stmt.executeUpdate(sql);
stmt.close();
c.close();
}
catch ( Exception e ) {
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
System.exit(0);
}
}
public void ObrisiPristup(String serijskibroj, String korisnickoime)
{
Connection c = null;
Statement stmt = null;
try {
Class.forName("org.sqlite.JDBC");
c = DriverManager.getConnection("jdbc:sqlite:" + naziv + ".db");
stmt = c.createStatement();
String sql = "DELETE from PRISTUPI where KORISNICKOIME = '" + Encrypt(korisnickoime) + "' AND VAGE = '" + Encrypt(serijskibroj) + "';";
stmt.executeUpdate(sql);
stmt.close();
c.close();
}
catch ( Exception e ) {
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
System.exit(0);
}
}
You are not closing your connection in ProveriDaLiPostojiPristup(String, String).
You should always wrap your connections in try-with-resources or try-finaly, so they are always closed.
c = DriverManager.getConnection("jdbc:sqlite:" + naziv + ".db");
stmt = c.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM PRISTUPI;");
while(rs.next())
{
if(Decrypt(rs.getString("korisnickoime")).equals(korisnickoime) &&
Decrypt(rs.getString("vage")).equals(serijskibroj))
return true;
}
rs.close();
stmt.close();
c.close();
What happens, is that your method returns true, but because the execution is stopped there, it won't execute the lines below it. This can be countered if you wrap the statements in a try with resources block:
try(c = DriverManager.getConnection("jdbc:sqlite:" + naziv + ".db")){
try(stmt = c.createStatement()){
try(ResultSet rs = stmt.executeQuery("SELECT * FROM PRISTUPI;")){
while(rs.next())
{
if(Decrypt(rs.getString("korisnickoime")).equals(korisnickoime) && Decrypt(rs.getString("vage")).equals(serijskibroj))
return true;
}
}
}
}
I am currently trying to scan and parse the file that is not in sql format. I am trying to input all the data into the SQL table but for some reason every time i run the program, i get the error saying unknown column 'what' in 'field list.' So the neither of the data goes through. 'what' is one of the names that is on the text. The table currently has 11 columns. I know I am parsing or scanning it wrong but I cannot figure out where. Here is my code:
public class parseTable {
public parseTable (String name) throws FileNotFoundException
{
File file = new File(name);
parse(file);
}
private void parse(File file) throws FileNotFoundException
{
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
String connectionUrl = "jdbc:mysql://localhost:3306/";
String connectionUser = "";
String connectionPassword = "";
conn = DriverManager.getConnection(connectionUrl, connectionUser, connectionPassword);
stmt = conn.createStatement();
Scanner scan = new Scanner(file);
String[] rowInfo = new String[11];
int count = 0;
while(scan.hasNextLine()){
//String data = scan.nextLine();
Scanner lineScan = new Scanner(scan.nextLine());
while(lineScan.hasNext()){
String words = lineScan.next();
if(count < 11){
rowInfo[count] = words;
count++;
}
else if(count == 11 && words.equals("States")){
rowInfo[count - 1] = rowInfo[count - 1] + " " + words;
}
else{
String query = "";
for(int i = 0; i < rowInfo.length; i++)
{
if(query.equals(""))
{
query = rowInfo[i];
}
else if(i == 9){
query = query + "," + rowInfo[i];
}
else if(rowInfo[i].equals(null)){
query = query + ", " + "NULL";
}
else
query = query + ", " + "'" + rowInfo[i] + "'";
}
stmt.executeUpdate("INSERT INTO dup VALUES(" + query + ")");
count = 0;
rowInfo = new String[11];
}
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try { if (rs != null) rs.close(); } catch (SQLException e) { e.printStackTrace(); }
try { if (stmt != null) stmt.close(); } catch (SQLException e) { e.printStackTrace(); }
try { if (conn != null) conn.close(); } catch (SQLException e) { e.printStackTrace(); }
}
}
}
And this is the data I'm trying to input:
1 hello cheese 1111 what#yahoo.com user adm street zip what USA
2 Alex cheese 1111 what#yahoo.com user adm street zip what USA
So this is my new code now, using PrepareStatement. However I still get an error and I looked online for the solution on where I'm making a mistake, but I cant seem to figure out where.
String query = "INSERT INTO mil_table (UserName, NameFirst, NameLast, supportID, EmailAddress, Password,
IDQ, AddressCity, AddressState, AddressZip, AddressCountry) VALUES(?,?,?,?,?,?,?,?,?,?,?)";
pstmt = conn.prepareStatement(query);
Scanner scan = new Scanner(file);
String[] rowInfo = new String[11];
int count = 0;
while(scan.hasNextLine()){
//String data = scan.nextLine();
Scanner lineScan = new Scanner(scan.nextLine());
while(lineScan.hasNext()){
String words = lineScan.next();
if(count < 11){
rowInfo[count] = words;
count++;
}
else if(count == 11 && words.equals("States")){
rowInfo[count - 1] = rowInfo[count - 1] + " " + words;
}
else{
for(int i = 0; i <rowInfo.length; i++)
{
pstmt.setString(i + 1, rowInfo[i]);
}
//stmt.executeUpdate("INSERT INTO mil_table VALUES(" + query + ")");
//System.out.println("#" + query + "#");
pstmt.executeUpdate();
count = 0;
rowInfo = new String[11];
}
}
As you are using MySQL, you will need to enclose the text inputs with quotes. Try enclosing the String values that you are inserting in quotes and then execute your code.
How do I to write an entire table to a flat file (text file) using jdbc? So far I've attempted the following:
Statement statement = connection.createStatement();
ResultSet result = statement.executeQuery("SELECT * FROM tablename");
BufferedInputStream buffer;
FileOutputStream out = new FileOutputStream("flatfile.txt");
while(result.next() )
{
buffer = new BufferedInputStream(result.getBinaryStream("????") );
byte[] buf = new byte[4 * 1024]; //4K buffer
int len;
while( (len = buffer.read(buf, 0, buf.length) ) != -1 )
{
out.write(buf, 0, len );
}
}
out.close();
"????" is just my placeholder. I am stuck on what to pass in as an argument.
You can get all the column names and the entire data from your table using the code below.
writeToFile method will contain the logic to writing to file (if that was not obvious enough :) )
ResultSetMetaData metadata = rs.getMetaData();
int columnCount = metadata.getColumnCount();
for (int i = 1; i <= columnCount; i++) {
writeToFile(metadata.getColumnName(i) + ", ");
}
System.out.println();
while (rs.next()) {
String row = "";
for (int i = 1; i <= columnCount; i++) {
row += rs.getString(i) + ", ";
}
System.out.println();
writeToFile(row);
}
Here's how I dump a table from a JDBC connection, very useful for debugging if you want to see all rows that are in an in memory (ex: HSQL) DB for instance:
public static void spitOutAllTableRows(String tableName, Connection conn) {
try {
System.out.println("current " + tableName + " is:");
try (PreparedStatement selectStmt = conn.prepareStatement(
"SELECT * from " + tableName, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
ResultSet rs = selectStmt.executeQuery()) {
if (!rs.isBeforeFirst()) {
System.out.println("no rows found");
}
else {
System.out.println("types:");
for (int i = 0; i < rs.getMetaData().getColumnCount(); i++) {
System.out.print(rs.getMetaData().getColumnName(i + 1) + ":" + rs.getMetaData().getColumnTypeName(i + 1) + " ");
}
System.out.println();
while (rs.next()) {
for (int i = 1; i < rs.getMetaData().getColumnCount() + 1; i++) {
System.out.print(" " + rs.getMetaData().getColumnName(i) + "=" + rs.getObject(i));
}
System.out.println("");
}
}
}
}
catch (SQLException e) {
throw new RuntimeException(e);
}
}
output is like
current <yourtablename> is:
types:ID:INT YOURCOLUMN1:VARCHAR YOURCOLUMN2:VARCHAR
ID=1 YOURCOLUMN1=abc YOURCOLUMN2=null
ID=2 YOURCOLUMN1=def YOURCOLUMN2=ghi
...
result.getBinaryStream("????") will only return for the value for that column as you put as placeholder.
If you want to get all the column, you need to use ResultSetMetaData from ResultSet
ResultSetMetaData metadata = resultSet.getMetaData();
int columnCount = metadata.getColumnCount();
for (int i=1; i<=columnCount; i++)
{
String columnName = metadata.getColumnName(i);
System.out.println(columnName);
}
This question already has answers here:
ResultSet exception - before start of result set
(6 answers)
Closed 5 years ago.
I have a Java method that is supposed to get column values from one MySQL row and create a string with the values. When run, it generates a SQL error 1078 "Before start of result set."
Here is the the class in which the error is occuring (Problem is in listPosesInSection method:
/** Class used to access the database */
import java.sql.*;
import java.util.ArrayList;
import javax.swing.JOptionPane;
public class YogaDatabaseAccess {
String dbUrl = "jdbc:mysql://localhost/yoga";
private Connection connection;
private ResultSet rset;
private ResultSetMetaData rsMetaData;
private Statement statement;
private PreparedStatement pStatementAll = null;
private PreparedStatement pStatementPartial = null;
// Strings for queries and updates
String strListPosesNotPrimary;
String strInsertNewClass;
String strInsertNewSection;
String strInsertNewPose;
String strUpdateClass;
String strUpdateSection;
String strUpdatePose;
String strArrangePoseOrder;
private String[] poseArray;
// Constructor
YogaDatabaseAccess() {
connectToDatabase();
}
// Method that connects to database
private void connectToDatabase() {
try {
connection = DriverManager.getConnection(dbUrl, "Kyle", "Kullerstrand#2");
System.out.println("Database connected");
}
catch(SQLException e) {
System.out.println(e.getMessage());
}
}
// Query that returns lists to be used with combo boxes
public String listForBoxes(String listName) {
// List to be returned
String strList = "";
// Determine name of the database table for this list
String listTableName;
if (listName == "pose")
listTableName = listName + "s";
else if (listName == "class")
listTableName = listName + "es";
else
listTableName = listName;
// Determine the database column name for this list
String listColumnName = listName + "_name";
// Run the query
try {
statement = connection.createStatement();
rset = statement.executeQuery("SELECT DISTINCT " + listColumnName + " FROM " + listTableName +
" ORDER BY " + listColumnName);
while (rset.next()){
strList = strList + rset.getString(listColumnName) + ", ";
}
} catch (SQLException e) {
e.printStackTrace();
}
return strList;
}
// Query that returns list of primary poses for a section
public String listPrimaryPoses(String sectionName) {
// List to be returned
String strList = "";
// Run the query
try {
statement = connection.createStatement();
rset = statement.executeQuery("SELECT DISTINCT pose_name FROM poses WHERE primarily_suitable_for = '" + sectionName +
"' OR primarily_suitable_for = 'Anything' ORDER BY pose_name");
while (rset.next()){
strList = strList + rset.getString("pose_name") + ", ";
}
} catch (SQLException e) {
e.printStackTrace();
}
return strList;
}
// Query that returns list of secondary poses for a section
public String listSecondaryPoses(String sectionName) {
// List to be returned
String strList = "";
// Run the query
try {
statement = connection.createStatement();
rset = statement.executeQuery("SELECT DISTINCT pose_name FROM poses WHERE sometimes_suitable_for = '" + sectionName + "' ORDER BY pose_name");
while (rset.next()){
strList = strList + rset.getString("pose_name") + ", ";
}
} catch (SQLException e) {
e.printStackTrace();
}
return strList;
}
// Query that returns the poses within a specific section
public String listPosesInSection(String tableName, String sectionName) {
String strList;
StringBuilder strBuilderList = new StringBuilder("");
// Run the query
try {
statement = connection.createStatement();
// Query will collect all columns from one specific row
rset = statement.executeQuery("SELECT * FROM " + tableName + " WHERE " + tableName + "_name = '" + sectionName + "'");
while (rset.next()) {
for (int i = 2; i <= countColumnsInTable(tableName); i++) // First value (0) is always null, skip section name (1)
if (rset.getString(i) != null) // If column has a value
strBuilderList.append(rset.getString(i) + "\n");
}
} catch (SQLException e) {
e.printStackTrace();
}
strList = strBuilderList.toString();
return strList.replaceAll(", $",""); // Strips off the trailing comma
}
// Insert statement that inserts a new class into the classes table
public void insertNewClass(String className) {
/** String insert = "INSERT INTO poses (pose_name, primarily_suitable_for, sometimes_suitable_for) values(?, ?, ?)";
System.out.println("About to create the prepared statement");
// Run the insert
try {
pStatement = connection.prepareStatement(insert);
// statement.execute("INSERT IGNORE INTO poses VALUES ('" + poseName + "', '" + suitableFor + "', '" + suitableForSometimes + "')");
pStatement.setString(1, poseName);
pStatement.setString(2, suitableFor);
pStatement.setString(3, suitableForSometimes);
System.out.println("Created the prepared statement");
// execute query, and return number of rows created
pStatement.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} */
}
// Insert statement that inserts a new pose into poses table
public void insertNewPose(String poseName, String suitableFor, String suitableForSometimes) {
String insertAll = "INSERT INTO poses (pose_name, primarily_suitable_for, sometimes_suitable_for) values(?, ?, ?)";
String insertPartial = "INSERT INTO poses (pose_name, primarily_suitable_for) values(?, ?)";
// Run the insert
try {
if (suitableForSometimes == "NULL") { // Insert statement contains a null value for sometimes suitable column
pStatementPartial = connection.prepareStatement(insertPartial);
pStatementPartial.setString(1, poseName);
pStatementPartial.setString(2, suitableFor);
pStatementPartial.executeUpdate();
} else { // Insert statement contains values for all three columns
pStatementAll = connection.prepareStatement(insertAll);
pStatementAll.setString(1, poseName);
pStatementAll.setString(2, suitableFor);
pStatementAll.setString(3, suitableForSometimes);
pStatementAll.executeUpdate();
}
} catch (SQLException e) {
System.err.println("SQLException: " + e.getMessage() + ":" + e.getSQLState());
JOptionPane.showMessageDialog(null, "This pose already exists.");
} finally {
SQLWarning w;
try {
for (w = connection.getWarnings(); w != null; w = w.getNextWarning())
System.err.println("WARNING: " + w.getMessage() + ":" + w.getSQLState());
} catch (SQLException e) {
e.printStackTrace();
JOptionPane.showMessageDialog(null, "An unknown error in the yoga design program has occurred.");
}
}
}
// Insert statement that inserts a new section into warmup, work or restore sections
public void insertNewSection(String sectionType, String sectionName, ArrayList<String> poses) {
System.out.println("insertNewSection method was called");
int maxColumns = countColumnsInTable(sectionType);
poseArray = new String[poses.size()];
poseArray = poses.toArray(poseArray);
if (poseArray.length == 0)
JOptionPane.showMessageDialog(null, "There are no poses in this section. Please add poses.");
// Create a list of columns of the table for the INSERT statement
StringBuilder columns = new StringBuilder(sectionType + "_name");
for (int c = 1; c < maxColumns; c++)
columns.append(", pose_" + c);
// Create a string list of poses, separated by commas, from the array
StringBuilder values = new StringBuilder();
values.append("'" + poseArray[0] + "'");
for (int v = 1; v < poseArray.length - 1; v++)
values.append(", '" + poseArray[v] + "'");
// make sure query uses correct number of columns by padding the query with NULL
for (int i = poseArray.length; i < maxColumns; i++)
values.append(", NULL");
String posesToAddToSection = values.toString();
// The string containing the entire insert statement
String insert = "INSERT INTO " + sectionType + " (" + columns + ") VALUES ('" + sectionName + "', " + posesToAddToSection + ")";
// Run the insert
try {
statement = connection.createStatement();
statement.executeUpdate(insert);
} catch (SQLException e) {
System.err.println("SQLException: " + e.getMessage() + ":" + e.getSQLState());
JOptionPane.showMessageDialog(null, "An error in the yoga design program has occurred. SQLException: " +
e.getMessage() + ":" + e.getSQLState());
} finally {
SQLWarning w;
try {
for (w = connection.getWarnings(); w != null; w = w.getNextWarning())
System.err.println("WARNING: " + w.getMessage() + ":" + w.getSQLState());
} catch (SQLException e) {
e.printStackTrace();
JOptionPane.showMessageDialog(null, "An unknown error in the yoga design program has occurred.");
}
}
}
// Statement that deletes rows from tables
public void deleteRow(String tableName, String columnName, String rowName) {
String delete = "DELETE FROM " + tableName + " WHERE " + columnName + " = '" + rowName + "'";
// Run the insert
try {
statement = connection.createStatement();
statement.executeUpdate(delete);
System.out.println("Delete statement was run on Java's end.");
} catch (SQLException e) {
System.err.println("SQLException: " + e.getMessage() + ":" + e.getSQLState());
JOptionPane.showMessageDialog(null, "Sorry, something went wrong: SQLException: " +
e.getMessage() + ":" + e.getSQLState());
} finally {
SQLWarning w;
try {
for (w = connection.getWarnings(); w != null; w = w.getNextWarning())
System.err.println("WARNING: " + w.getMessage() + ":" + w.getSQLState());
} catch (SQLException e) {
e.printStackTrace();
}
}
}
// Method for getting the number of columns in a table using metadata
public int countColumnsInTable(String sectionType) {
int count = 16;
try {
// System.out.println(sectionType);
statement = connection.createStatement();
rset = statement.executeQuery("SELECT * FROM " + sectionType);
rsMetaData = rset.getMetaData();
count = rsMetaData.getColumnCount();
// System.out.println("Column count is " + count);
} catch (SQLException e) {
e.printStackTrace();
}
return count;
}
// Close the database and release resources
public void closeDatabase() {
try {
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
And here is the beginning of the error list:
java.sql.SQLException: Before start of result set
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)
at com.mysql.jdbc.ResultSetImpl.checkRowPos(ResultSetImpl.java:855)
at com.mysql.jdbc.ResultSetImpl.getStringInternal(ResultSetImpl.java:5773)
at com.mysql.jdbc.ResultSetImpl.getString(ResultSetImpl.java:5693)
at YogaDatabaseAccess.listPosesInSection(YogaDatabaseAccess.java:125)
at YogaSectionDesigner$5.actionPerformed(YogaSectionDesigner.java:229)
May be you can check this out:
ResultSet exception - before start of result set
Had the same Problem. Solved it that way.