Retrieve sql date and store in java object which expects localDate - java

I have to retrieve a Date from an oracle database and store it into a java object as localDate. This is the code I have tried:
public Sample findSampleById(Integer sampleId) {
// TODO Auto-generated method stub
PreparedStatement pStmt = null;
ResultSet rs = null;
Sample sample = new Sample();
String sql = "select * from sample where sampleid =" + sampleId;
try {
pStmt = getConnection().prepareStatement(sql);
rs = pStmt.executeQuery();
while(rs.next()) {
sample.setSampleId(rs.getInt("sampleid"));
sample.setSampleKindId(rs.getInt("samplekindid"));
sample.setExpirationDate(rs.getDate("expirationdate").toInstant().atZone(ZoneId.systemDefault()).toLocalDate());
}
} catch (SQLException e) {
throw new DataException(e);
}
return sample;
}
Instead of this sample.setExpirationDate(rs.getDate("expirationdate").toInstant().atZone(ZoneId.systemDefault()).toLocalDate());
I have also tried this
java.sql.Date retrieved = java.sql.Date.valueOf(rs.getString("expirationDate")); sample.setExpirationDate(retrieved.Date());
Sample is a class with int sampleId, int sampleKindId and LocalDate expirationDate
My JUnit Test for the method tells me in the line where I ask for the expiration date that it throws an exception. Do I do anything wrong with the conversion?


Method getDate, in interface java.sql.ResultSet, returns an instance of java.sql.Date.
You just need to call method toLocalDate on the value returned by method getDate.
I don't have your database so I simply tried selecting SYSDATE from the DUAL database table in Oracle. The following code worked fine.
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.time.LocalDate;
public class JdbcTest {
public static void main(String[] args) {
String url = "jdbc:oracle:thin:..."; // Replace with your appropriate URL
try (Connection conn = DriverManager.getConnection(url);
Statement s = conn.createStatement();
ResultSet rs = s.executeQuery("select sysdate from dual")) {
if (rs.next()) {
Date sysdate = rs.getDate(1);
LocalDate ld = sysdate.toLocalDate();
System.out.println("LocalDate: " + ld);
System.out.println(" sysdate: " + sysdate);
}
}
catch (Exception x) {
x.printStackTrace();
}
}
}
Refer to Convert between LocalDate and sql.Date

Related

Unable to get column name and column lable in sql server result set meta data

Can anybody help me to get actual column name and its alias using ResultSetMetaData by connecting to sqlserver database.
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
class MysqlCon {
public static void main(String args[]) {
Connection con = null;
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
con = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName=alcoa", "sa", "test");
Statement stmt = con.createStatement();
String query = "SELECT std_code as \"Student code\" from Student ";
ResultSet rs = stmt.executeQuery(query);
ResultSetMetaData rsm =rs.getMetaData();
for (int i = 1; i <= rsm.getColumnCount(); i++) {
System.out.println(rsm.getColumnLabel(i) + "--" + rsm.getColumnName(i));
}
} catch (Exception e) {
System.out.println(e);
} finally {
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
output
Student code--Student code
Above code works as expected in other database like mysql and oracle.
I checked code for SQLServerResultSetMetaData. Both methods getColumnLabel and getColumnName are identical.
abzycdxw65, has raised same issue on their github account. it is closed.
Is there any way to get following output:
Student code--std_code

If I get your question you can try the followings to retrieve column names
select name from sys.columns

How to use #queryparam when using array in Java

I am using a restful web service and I was able to display database records using an array. But I am confused on how will I be able to display my desired record. I have here the class where the SQL query is being executed. I am using Advanced Rest Client google chrome application in testing the response and the output. How will I be able to query 'select * from taxi where taxi_plate_no='inputted data''? I am really confused on how will I be able to do it in an array. Please help me. Thank you! :(
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import javax.ws.rs.QueryParam;
import com.taxisafe.objects.Objects;
public class DisplayArrayConnection
{
public ArrayList<Objects> getDetails(Connection con) throws SQLException{
ArrayList<Objects> taxiDetailsList = new ArrayList<Objects>();
PreparedStatement stmt = con.prepareStatement("SELECT * FROM taxi");
ResultSet rs = stmt.executeQuery();
try
{
while(rs.next())
{
Objects detailsObject = new Objects();
detailsObject.setTaxi_name(rs.getString("taxi_name"));
detailsObject.setTaxi_plate_no(rs.getString("taxi_plate_no"));
taxiDetailsList.add(detailsObject);
}
} catch (SQLException e)
{
e.printStackTrace();
}
return taxiDetailsList;
}
}

#QueryParam is annotation used in rest webservices .
And i think here you want to use parameter with your SQL query.
So using parameter in PreparedStatement use following code
public class DisplayArrayConnection
{
public ArrayList<Objects> getDetails(Connection con,String taxiNumber) throws SQLException{
ArrayList<Objects> taxiDetailsList = new ArrayList<Objects>();
PreparedStatement stmt = con.prepareStatement("SELECT * FROM taxi WHERE taxi_plate_no= ?");
stmt.addString(1,taxiNumber);
ResultSet rs = stmt.executeQuery();
try
{
while(rs.next())
{
Objects detailsObject = new Objects();
detailsObject.setTaxi_name(rs.getString("taxi_name"));
detailsObject.setTaxi_plate_no(rs.getString("taxi_plate_no"));
taxiDetailsList.add(detailsObject);
}
} catch (SQLException e)
{
e.printStackTrace();
}
return taxiDetailsList;
}
}
Note: Use parameter taxiNumber or any other parameter you want to
retrive data on that parameter
and use setString(position,value); to replace ? with that parameter

Java Oracle database connection error

I am new to Java and Oracle. I am trying to make an application that lists serial numbers of a product and when you click on a product's serial number from the list, it shows the other column informations from the database in a textbox. I have a form named CRUD.I am using Oracle 10g. Code is here:
package project1;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class CRUD extends javax.swing.JFrame {
Connection connection = null;
public CRUD() {
try {
initComponents();
String driverName = "oracle.jdbc.driver.OracleDriver";
Class.forName(driverName);
String serverName = "192.168.0.36";
String portNumber = "1521";
String sid = "XE";
String url = "jdbc:oracle:thin:#"+serverName+":"+portNumber+":"+sid;
String userName = "HR";
String password = "hr";
try {
connection = DriverManager.getConnection(url,userName,password);
} catch (SQLException ex) {
Logger.getLogger(CRUD.class.getName()).log(Level.SEVERE, null, ex);
}
try {
String temp="";
Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery("SELECT SERI_NO FROM KART");
while(rs.next()) // dönebildiği süre boyunca
{
String s = rs.getString("SERI_NO") ; //kolon isimleri oluşturuldu
temp+=s+"_";
}
Object [] tem_obj;
tem_obj=temp.split("_");
listOgrenciler.setListData(tem_obj);
} catch (SQLException ex) {
Logger.getLogger(edit.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (ClassNotFoundException ex) {
Logger.getLogger(CRUD.class.getName()).log(Level.SEVERE, null, ex);
}
listOgrenciler.addListSelectionListener(new ListSelectionListener() {
#Override
public void valueChanged(ListSelectionEvent arg0) {
if (!arg0.getValueIsAdjusting()) {
try {
Statement stmtx = connection.createStatement();
Object[] sss=listOgrenciler.getSelectedValues();
String swhere="" ;
for (int i = 0; i < sss.length; i++) {
swhere+=sss[i].toString()+",";
}
swhere=swhere.substring(0,swhere.length()-1);
ResultSet rsx = stmtx.executeQuery("SELECT * FROM KART where SERI_NO in ("+swhere+")") ;
String temp="";
Object [] tem_obj;
tem_obj=temp.split("_");
String ara="";
for (int i = 0; i < tem_obj.length; i++) {
ara+=tem_obj[i].toString()+"\n";
}
texttoarea.setText(ara);
} catch (SQLException ex)
{
Logger.getLogger(edit.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
});
}
Errors i get are here:
20.Şub.2014 11:22:11 project1.CRUD$1 valueChanged
SEVERE: null
java.sql.SQLSyntaxErrorException: ORA-00904: "SNS080961097": invalid identifier
.....
at project1.CRUD$1.valueChanged(CRUD.java:78)
......
As I said before, I am new to both Java and Oracle. If the errors are so obvious don't laugh:)

Your this query
ResultSet rsx = stmtx.executeQuery("SELECT * FROM KART where SERI_NO in ("+swhere+")") ;
should be like this:
ResultSet rsx = stmtx.executeQuery("SELECT * FROM KART where SERI_NO in ('"+swhere+"')") ;

Actually there is no problems with you connection step to Oracle DB, its connected successfully, Your problem is within the query. make sure that you have a SERI_NO column in your KART table.
i suggest you to RUN the both same queries in you code from any SQL client such SQLDeveloper and see what these queries retrieve.

Observe this statement once,
swhere=swhere.substring(0,swhere.length()-1);
replace the above statement with the following
shere=swhere.substring(0,swhere.length()-2);
Because an extra comma(,) is included in your sql statement.

There is no issue with your connection.
Please add some logging to your code and you will know exactly where the error is throwing.
I guess the error is throwing in this line..
SELECT * FROM KART where SERI_NO in ("+swhere+")
You have to specify this as a string with '',where you actual select should look like below.
SELECT * FROM KART where SERI_NO in ('ABC','XCV');
so please check with this one check the value of the "swhere"

How do I call variables from a Java class into another Class?

I've read about inheritance or using the import. I just simply am unable to get the right answer. Firstly my code is of the following form:
class queries{
String query1="Select * from "+tableName+";
String query2="Select "+columnName+" from "+tableName+";
}
Now, I have another class where I wish to make make SQL queries using the queries mentioned in the queries class:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
class test{
public static void main(String args[])throws SQLException
{
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
System.out.println("This is Wrong");
// TODO Auto-generated catch block
e.printStackTrace();
}
Connection connect = DriverManager
.getConnection("SQLCONNECTION");
PreparedStatement preparedStatement = connect
.prepareStatement(THIS SHOULD CALL query1 or query2);
ResultSet resultSet = preparedStatement.executeQuery();
while (resultSet.next()) {
System.out.println("THIS RUNS");
//display text
}
preparedStatement.close();
connect.close();
}
}
So well, I need to figure out how to call query1 or query2 from the queries class in test. Sorry, but I hope someone can help me how to do this in a clean way. I can also create a Hashtable in queries where I call the respective query based on its name.
Thanks a lot.

class queries
{
public static String getQuery1(String tableName)
{
return "Select * from "+tableName;
}
public static String getQuery2(String tableName, String columnName)
{
return "Select "+columnName+" from "+tableName;
}
}
Then do this:
PreparedStatement preparedStatement =
connect.prepareStatement(queries.getQuery1("INSERT TABLE NAME HERE"));

selecting data from cassandar using cql

i am using cassandra-jdbc to perform the operation on data in cassandra but when i run this simple program i get exception.
this is my code:
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.*;
import javax.sql.*;
public class Operations
{
public static void main(String[] args){
try
{
Class.forName("org.apache.cassandra.cql.jdbc.CassandraDriver");
Connection con = DriverManager.getConnection("jdbc:cassandra://localhost:9160/temp");
String qry = "select name FROM cql";
Statement smt = con.createStatement();
ResultSet resultSet = smt.executeQuery(qry);
System.out.println(resultSet);
while(resultSet.next())
{
System.out.println(resultSet);
}
}
catch(Exception e)
{
System.out.println(" : "+e.getMessage());
}
}
}
i got :cannot parse 'name' as hex bytes

Try:
import static org.apache.cassandra.utils.Hex.bytesToHex;
...
String name = bytesToHex("name".getBytes());
String qry = "select '" + name + "' FROM cql";

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