I have a problem with renaming a specific value in a column in mySQL Database. At first i thought i could just use 'AS' to rename, but i'm actually trying to rename a value in a column. My column is named FoundLost. In this column I Store values '0' and '1'. '0' is Found and '1' is Lost.
The reason I need to rename this values is because I use the data from this database to create a pieChart. with the function .getName it gives the names '0' and '1'.
I was hoping someone could help me out!
The class with the query is the code below:
public static ObservableList getPChartFoundLost() {
String query = "SELECT FoundLost, concat(round(count(FoundLost) *100 / (SELECT count(FoundLost) FROM Luggage))) AS percent FROM Luggage GROUP BY FoundLost";
ObservableList FoundLost = FXCollections.observableArrayList();
Connection connection = DatabaseUtils.connect();
if (connection != null) {
try {
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(query);
while (resultSet.next()) {
FoundLost.add(new PieChart.Data(resultSet.getString("FoundLost"), resultSet.getInt("percent")));
}
resultSet.close();
statement.close();
} catch (SQLException sqle) {
System.out.println(sqle.getMessage());
}
DatabaseUtils.disconnect(connection);
}
return FoundLost;
}
Controller:
public void clickPChartFoundLost(ActionEvent event) {
//PieChart
ObservableList FoundLost = StatisticsUtils.getPChartFoundLost();
pieChart.setVisible(true);
pieChart.setData(FoundLost);
pieChart.setTitle("Found and Lost luggage");
for (final PieChart.Data data : pieChart.getData()) {
data.getNode().addEventHandler(MouseEvent.ANY,
new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent e) {
//Label vullen met data van Observable list uit Database
pieChartValueLable.setText(String.valueOf(data.getName()) + ": "
+ String.valueOf(data.getPieValue()) + "%");
}
});
}
}
Thanks!!
In your query, try this as your first column instead of just FoundLost. It translates your 0 and 1 values to meaningful strings for your chart. The rest of your query can stay the same.
IF(FoundLost = 0,'Found','Lost') AS FoundLost
Related
I keep getting one value from this LinkedHashMap it's either the first [ if (resultset.next()) ] or the last [ while(resultset.next()) ], only one result is coming back but I want the full map. How do I return all rows in the table that fit my criteria? Any help would be appreciated.
/** A method to list all previous statuses for a certain user given the userID */
public StringBuilder showStatusHistory(int userID) {
try {
Date date;
String status;
preparedStatement = createStatement("select statusDate,statusText from statusTable where userID = ?");
preparedStatement.setInt(1,userID);
resultSet = preparedStatement.executeQuery();
StringBuilder allStatus = new StringBuilder("");
statusesList = new LinkedHashMap<>();
while (resultSet.next()){
date = resultSet.getDate(1);
status = resultSet.getString(2);
statusesList.put(date,status);
}
Set<Date> statusTime = statusesList.keySet();
for(Date k:statusTime){
allStatus.append(k+" "+statusesList.get(k));
}
return allStatus;
}
catch (SQLException sqlE){
sqlE.printStackTrace();
}
return null;
/** A helper method was used to minimize code duplication. It works for sure */
private PreparedStatement createStatement(String query) {
try {
connection = DB_ConnectionConfiguration.getConnection();
this.query = query;
preparedStatement = connection.prepareStatement(query);
return preparedStatement;
}
catch (SQLException sqlE) {
sqlE.printStackTrace();
return null;
}
}
here are a couple suggestions in sample code below...
public StringBuilder showStatusHistory(int userID) {
// define at top and return "" if no results
StringBuilder allStatus = new StringBuilder("");
try {
Date date;
String status;
// define local in the method
PreparedStatement preparedStatement = createStatement("select statusDate,statusText from statusTable where userID = ?");
preparedStatement.setInt(1, userID);
// define local in the method
ResultSet resultSet = preparedStatement.executeQuery();
// append to the all Status here and skip the other loop
// if you need a distinct list (like you had fro the Set) you could use a DISTINCT on the SQL statement.
while (resultSet.next()) {
date = resultSet.getDate(1);
status = resultSet.getString(2);
// append to the allStatus here
allStatus.append(date).append(" ").append(status); // add a newline to the end? append(System.lineSeparator())
}
} catch (SQLException sqlE) {
sqlE.printStackTrace();
// do you want to throw this if something bad happened?
} finally {
// close up your jdbc resources
}
// will contain "" if no records or concatenated statuses from the resultset
return allStatus;
}
I have developed a MySQL database with 3 different columns. Among three columns, I used 2 columns to develop a network using JUNG. Now if I place a mouse over the vertex, the corresponding information from the third column should be displayed. I have tried with the following code with the help of setVertexToolTipTransformer. But nothing is displayed as an answer.
vv.setVertexToolTipTransformer(new Transformer<String, String>() {
public String transform(String v) {
try {
String bb = "SELECT * FROM interr'";
Statement pest = connection.createStatement();
ResultSet v1 = pest.executeQuery(bb);
while(v1.next())
v= v1.getString("Pubchem_ID");
return "PUBMED:"+v.toString();
}
catch (Exception e1) {
JOptionPane.showMessageDialog(null, e1);
}
return null;
}
});
Where should i edit my code? Can anyone pls help me with this?
I got the output with the following output
vv.setVertexToolTipTransformer(new Transformer<String, String>() {
public String transform(String v) {
try {
String bb = "SELECT * FROM interr";
Statement pest = connection.createStatement();
ResultSet v1 = pest.executeQuery(bb);
while(v1.next())
if(v.toString().equals(v1.getString("Mole1")))
na[i] = v1.getString("Pubchem_ID");
System.out.println(na[i]);
v=na[i].toString();
return "PUBMED:"+v.toString();
}
catch (Exception e1) {
JOptionPane.showMessageDialog(null, e1);
}
return null;
}
});
I Want to implement a sql as follows in SpringJDBC
SELECT note from item WHERE sku = :sku AND make = :make
But the query can't find the record actually exist when make is a null property.
After debug,I found out there is a difference between " make = null " and " make is null " in MYSQL. But there is no API i can find which is suited for that situation in SpringJDBC. Any clues for that or must in static sql?
Try this:
public Item findBySkuAndMake(String sku, String make) {
Item item = null;
try {
String sql = "SELECT note FROM item WHERE sku = :sku AND make = :make";
SqlParameterSource parameters = new MapSqlParameterSource()
.addValue("sku", sku)
.addValue("make", make);
item = namedParameterJdbcTemplate.queryForObject(sql, parameters, new ItemRowMapper());
} catch (DataAccessExceptione) {
System.err.printf("Something went wrong while trying to search inside ITEM; this is why: %s%n", e);
}
// Then read getNote() ...or just return it (and change the method's return type)
return item;
}
// This is up to you, I don't know what's inside *Item*
private static class ItemRowMapper implements RowMapper<Item> {
#Override
public Item mapRow(ResultSet resultSet, int i) throws SQLException {
return new Item(resultSet.getString("note"), resultSet.getString("sku"),
resultSet.getString("make");
}
}
If you need to make one (or more) field(s) conditional, just add an if clause in the SQL query and exclude it (or them) from SqlParameterSource.
I am trying to run the following query in my java web application:
SELECT platform AS "Platform" FROM edb.cases
The web-app is working fine and is able to execute all queries however whenever I use an alias (through 'AS'), the resultant data-set gives me a null value for the alias. In fact, despite using an alias for the column 'platform' in the above query, the resultant data-set has a null value for the key 'Platform' but gives me the correct value for the key 'platform' (which is the original name of the column).
Now the actual sql statement which I need to execute is a bit more complex with select statements and left joins on the same table twice using aliases, like so:
SELECT numOne.platform , numTwo.platform AS 'PlatformTwo' FROM edb.cases LEFT JOIN
edb.platform as numOne ON (numOne.rank = cases.platform) LEFT JOIN edb.platform as numTwo ON
(numTwo.rank = cases.highestPlatform) WHERE cases.index = 1000
The problem is that the resultant data-set contains the correct value for the key 'platform' (for numOne table) but the keys 'PlatformOne' and 'PlatformTwo' DO NOT EXIST. The aliases are not working!
I have tried both the statements in MySql workbench and they work fine.
Please do not hesitate to ask for more information.
EDIT:
The code that prepares the query and sends it to the database:
public static List<Map<String, Object>> executeQuery(final String query,
Map<Integer, Object> data) {
List<Map<String, Object>> result = null;
try {
Connection conn = createConnection();
PreparedStatement pstmt = null;
pstmt = conn.prepareStatement(query);
if(data != null) {
pstmt = createPreparedStatement(pstmt, data);
}
System.out.println(pstmt.toString());
//The GET_CASE_FOR_INDEX query uses the executequery function in the else block:
if((pstmt.toString().indexOf("INSERT") >= 0) || (pstmt.toString().indexOf("UPDATE") >= 0)) {
pstmt.executeUpdate();
} else {
ResultSet rs = pstmt.executeQuery();
ResultSetMetaData md = rs.getMetaData();
int columns = md.getColumnCount();
result = new ArrayList<Map<String, Object>>();
/*
* Get the next row of the ResultSet 'rs' and insert a Map of the Column/Value pair
* into the ArrayList of Maps 'result'
*/
while(rs.next()) {
Map<String, Object> row = new HashMap<String, Object>(columns);
for(int i=1; i <= columns; i++) {
try {
row.put(md.getColumnName(i), rs.getObject(i));
} catch(Exception e) {
System.out.println(md.getColumnName(i));
System.out.println(row);
e.printStackTrace();
}
}
result.add(row);
}
}
destroyConnection(conn);
pstmt.close();
} catch(SQLException e) {
//TODO
e.printStackTrace();
}
return result;
}
The function creating the prepared statement:
//creates a prepared statement by checking the type of the value that needs to be set.
private static PreparedStatement createPreparedStatement(
PreparedStatement pstmt, Map<Integer, Object> data) {
try {
for(Integer key : data.keySet()) {
Object value = data.get(key);
System.out.println(key);
if(data.get(key).equals(Types.NULL)) {
pstmt.setNull(key, Types.INTEGER);
} else if(value.getClass().equals(Integer.class)) {
pstmt.setInt(key, (Integer) value);
} else if(value.getClass().equals(String.class)) {
pstmt.setString(key, (String) value);
} else if(value.getClass().equals(Date.class)) {
pstmt.setDate(key, (Date) value);
} else if(value.getClass().equals(Timestamp.class)) {
pstmt.setTimestamp(key, (Timestamp) value);
}
}
}catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return pstmt;
}
And the code snippet which uses the executeQuery function to execute the query and sends it to the web template:
Map<Integer, Object> data_details = new HashMap<Integer, Object>();
data_details.put(1, parameter_ID);
List<Map<String, Object>> details = DBUtility.executeQuery(DBQuery.GET_CASE_FOR_INDEX, data_details);
webContext.setVariable("details", details);//This is where the template variable is being set
System.out.println(details);
The GET_CASE_FOR_INDEX query is :
SELECT numOne.platform , numTwo.platform AS 'PlatformTwo' FROM edb.cases LEFT JOIN
edb.platform as numOne ON (numOne.rank = cases.platform) LEFT JOIN edb.platform as numTwo ON
(numTwo.rank = cases.highestPlatform) WHERE cases.index = ?
When I print the details hash map (which is the result data-set) the key PlatformTwo is entirely absent!
You are using the .getColumnName method of ResultSetMetaData, which returns the name of the underlying column (if available). .getColumnLabel will return the column alias as defined by SELECT ... AS ....
To illustrate, the following Java code
PreparedStatement ps = conn.prepareStatement(
"SELECT platform AS Platypus FROM cases");
ResultSet rs = ps.executeQuery();
ResultSetMetaData rsmd = rs.getMetaData();
System.out.println(String.format(
".getColumnName returns \"%s\"",
rsmd.getColumnName(1)));
System.out.println(String.format(
".getColumnLabel returns \"%s\"",
rsmd.getColumnLabel(1)));
returns
.getColumnName returns "platform"
.getColumnLabel returns "Platypus"
Here are my codes :
public void submitReply(ActionEvent e) {
String replyBy = userName;
String reply = jTextArea_reply.getText();
if (reply.equals("")) {
JOptionPane.showMessageDialog(null, "Comment cannot leave blank");
} else {
eForumTopics comment = new eForumTopics(replyBy, reply);
if (comment.createComment() == true) {
JOptionPane
.showMessageDialog(null,
"Reply submitreted successfully. You will be redirect to main page.");
SetUpJTableComment();
public void SetUpJTableComment() {
// Get jTable model
DefaultTableModel tableModel1 = (DefaultTableModel) jTableComment
.getModel();
// Store column data into Array (3 columns)
String[] data = new String[3];
// Set Up Database Source
db.setUp("IT Innovation Project");
String sql = "Select reply_content,reply_by from forumReplies WHERE reply_topic = "
+ topicId + "";
ResultSet resultSet = null;
// Call readRequest to get the result
resultSet = db.readRequest(sql);
try {
while (resultSet.next()) {
data[0] = resultSet.getString("reply_content");
data[1] = resultSet.getString("reply_by");
// Add data to table model
tableModel1.addRow(data);
}
resultSet.close();
} catch (Exception e) {
System.out.println(e);
}
// add tablemodel to jtable
}
The problem is whenever users post a new reply, the existing posts will be re-added together. I try to do like only the newer reply from the comment box will be added into the jTable instead of keep on re-add the existing posts with newer reply. What am I supposed to use? A for loop? Thanks in advance.
The correct way to delete the content of DefaultTableModel is
model.setRowCount(0);
vs. the evil way mentioned in the comment (won't repeat it here ;-) which violates two rules
never change the underlying datastructure of a model under its feet
never call any of the model's fireXX from code outside the model
If doing the latter seems to help, it's a waring signal: you either violated the former or your model implementation is incorrect