We Keep Coding

Creating a Table and insertion data into database not working properly with mysql and java jdbc

ConnectionClass:
Here I used stm.execute but I'm not getting an error. I also used executeUpdate but I'm also getting an error.
package com.company;
import java.sql.*;
class ConnectionClass {
private static Connection con = null;
private static Statement stm = null;
private static ConnectionClass connectionClass;
public void createConnection() {
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mysql", "root", "root");
}
catch (Exception e) {
e.printStackTrace();
}
}
public void createTable() {
String Table_Name = "BOOK";
try {
stm = con.createStatement();
DatabaseMetaData dbm = con.getMetaData();
ResultSet rs = dbm.getTables(null, null, Table_Name, null);
if (rs.next()) {
System.out.println("Table" + Table_Name + "Already created");
} else {
String sql = "CREATE TABLE" + Table_Name + "(ID VARCHAR(200), title VARCHAR(200),author varchar(100),publisher varchar(100)";
stm.executeLargeUpdate(sql);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
public ConnectionClass() {
createConnection();
createTable();
}
}
MainClass:
Here I think the main class is working properly.
package com.company;
public class Main {
public static void main(String[] args) throws Exception {
ConnectionClass connectionClass = new ConnectionClass();
}
}
ERROR:

The method executeLargeUpdate was added in Java 8 / JDBC 4.2 and judging by the error it has not been implemented in the MySQL Connector/J version you are using.
The solution is simple: don't use any of the Large methods in the API, and instead use executeUpdate, or - better in the case of DML - execute. Alternatively, update to a newer version of MySQL Connector/J, as executeLargeUpdate is implemented in newer versions of MySQL Connector/J (eg 5.1.46, but at least 5.1.37 (the version that added support)).
You will also need to address the syntax error pointed out by Adil.

You have a syntax error in your query. You current SQL Query:
String sql = "CREATE TABLE" + Table_Name + "(ID VARCHAR(200), title VARCHAR(200),author varchar(100),publisher(100)";
Corrected SQL Query:
String sql = "CREATE TABLE" + Table_Name + "(ID VARCHAR(200), title VARCHAR(200),author varchar(100),publisher varchar(100)";
(You are asking mysql to create a column publisher, but where's the datatype? Simply specify the datatype and it will work.)
EDIT:
So, finally wrapping up this question, let's have a look at what Ora Docs have to say about this:
executeLargeUpdate:
default long executeLargeUpdate(String sql) throws SQLException
Executes the given SQL statement, which may be an INSERT, UPDATE, or DELETE statement or an SQL statement that returns nothing, such as an SQL DDL statement.
This method should be used when the returned row count may exceed Integer.MAX_VALUE - A constant holding the maximum value an int can have, 2^31-1.
Note:This method cannot be called on a PreparedStatement or CallableStatement.
The default implementation will throw UnsupportedOperationException. This method is introduced since JDK 1.8
Also note the above point as stated in the docs. The default implementation is to throw an UnsupportedOperationException. This means that different JDBC drivers can have different implementations of Statement class. They can either implement it or leave it unimplemented, and if you invoke the method in 2nd case, the method will throw an UnsupportedOperationException, as stated in the docs.
By checking the oracle docs for this method, you can get more information about it. So the possibility could be that the driver version you are using is not supporting this method, so please update tot eh latest version of this driver and try it out.

Creating a JAVA database from code. Statement wont execute and create table?

I'm not sure why my program isn't creating the table but I also need some ideas on how to fill the table with code like this once it's created? I need to add two more tables to this database too.
This is the error I'm getting :
java.sql.SQLSyntaxErrorException: Table/View 'PIZZASIZE' does not exist.
Caused by: ERROR 42X05: Table/View 'PIZZASIZE' does not exist.
Caused by: java.lang.RuntimeException: Exception in Application start method
Caused by: javafx.fxml.LoadException: file:/C:/Users/Allie/Documents/NetBeansProjects/Pizzeria_AllieBeckman/dist/run1674141987/Pizzeria_AllieBeckman.jar!/pizzeria_alliebeckman/FXMLDocument.fxml
This is the code that's supposed to create the table:
// connect to the derby URL using the given username and password
connect = DriverManager.getConnection("jdbc:derby://localhost:1527/pizzeria;create=true", connectProps);
// current url for pre created database "jdbc:derby://localhost:1527/pizza"
// if connection is successful print that it succeeded.
System.out.println("database created");
stmt = connect.createStatement();
String sqlCreate = "CREATE TABLE PIZZASIZE "
+ "(id int NOT NULL, "
+ "size char(20) NOT NULL, "
+ "PRIMARY KEY (id))";
stmt.execute(sqlCreate);

Depending on the IDE you are using you could manually create the table in a console without going through the trouble of writing it in code. Here are some examples of how you could get the information from the tables.
Connection conn = CreatingDerbyDJB.dbConnection();
try{
String query = "INSERT INTO Items (Name,Color,ItemName,SchoolName, Description) VALUES(?,?,?,?, ?)";
PreparedStatement pstmt = conn.prepareStatement(query);
pstmt.execute();
conn.close();
}catch(Exception e)
{
e.printStackTrace();
} }
Here is what the Connection class should look like:
package main;
import java.sql.Connection;
import java.sql.DriverManager;
import javax.swing.JOptionPane;
public class CreatingDerbyDJB
{
public static final String DRIVER = "org.apache.derby.jdbc.EmbeddedDriver";
public static final String JDBC_URL = "jdbc:derby:LostAndFoundDB";
public static Connection dbConnection()
{
try
{
Class.forName(DRIVER).newInstance();
Connection c = DriverManager.getConnection(JDBC_URL);
return c;
}catch(Exception e)
{
JOptionPane.showMessageDialog(null, e);
return null;
}
}
}
Approve this answer if this helped you, I'd be happy to explain things if it does not make sense. :)

SQL error with mysql variables in hibernate

I have the following MySQL query which uses variables. The query is being used in an application which uses Hibernate. I have gotten around handling the assignments in hibernate by adding two backslashes as others have mentioned on stack.
However, when I try to run my application, I receive the following error:
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'PREPARE stmt1 from #sql_max; EXECUTE stmt1' at line 1
My sql query in hibernate is as follows:
private static final String COUNT_INTERQUARTILE_SQL
= " SET #sql_max \\:=('SELECT ''Max'' AS quartile, max(visit.id) as id " +
" FROM carecube.visit order by visit.id ');" +
" PREPARE stmt1 from #sql_max;" +
" EXECUTE stmt1;";
I'm unsure where the error is, o.O, am I missing something obvious? cheers.
EDIT: The statement which invokes the SQL:
#Override
public List<InterQuartileRange> interQuartileRange() {
// TODO Auto-generated method stub
return this.template.execute(new HibernateCallback<List<InterQuartileRange>>() {
#SuppressWarnings("unchecked")
#Override
public List<InterQuartileRange> doInHibernate(Session session) throws HibernateException {
Query query = session.createSQLQuery(COUNT_INTERQUARTILE_SQL);
return (List<InterQuartileRange>)query.list();
}
});
}

Postgres Query to know the db is up and running

(EDITED)
I am using the following code to check if my Postgres db is up and running. However if the machine running the db is slow (Not enough RAM for example) it sometimes pass but when i tried to get some real data from the db (a few millisec after) i fail. I guess because not all tables were loaded.
Here is my code:
public static boolean testDBConnection(boolean refreshFactory) throws Exception
Session session = null;
try {
if(refreshFactory){
ConnectionUtil.refreshSessionFactory();
}
session = ConnectionUtil.getSessionFactory().openSession();
String sql = "select 1";
session.createSQLQuery(sql).list();
return true;
}
catch (HibernateException e) {
String error = "Failed to connect db.";
throw ExceptionFactory.create(error);
}
finally{
if(session!=null){
session.close();
}
}
}
Is there a better way then "select 1"?
Thanks

calling PLSQL procedure from Java

Below is my Java program. I am calling a PLSQL procedure to update the Employee name. I turned off the commit in the PLSQL code so that I can do the commit and rollback from Java code. But even after I turned off the auto commit and doing explicit rollback, still the details are updated in the table.
How? I have no idea, please help.
Here's my Java code. In PLSQL, it just read the value and does an update statement . No commits.
public class TestCommit {
public static void main(String[] args) throws SQLException, IOException {
CallableStatement callableStatement = null;
Connection conn = null;
try {
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
conn = DriverManager
.getConnection("jdbc:oracle:thin:testuser/testpwd#//testdb:1521/testbx");
conn.setAutoCommit(false);
String sql = "{call testpkg.saveemployee(?,?)}";
callableStatement = conn.prepareCall(sql);
callableStatement.setString("name", "spider");
callableStatement.setString("id", "A101");
callableStatement.executeQuery();
conn.rollback();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
// Close the statement
callableStatement.close();
// Close the connection
conn.close();
}
}
}
edit: PLSQL
CREATE OR REPLACE PROCEDURE saveemployee(
name IN employee.ename%TYPE,
id IN employee.eid%TYPE)
IS
BEGIN
UPDATE employee SET ename = name WHERE eid = id;
END;

My bad, I was calling a wrong procedure, there were two versions of the same procedure in two different packages,
one has the commit , the other one doesn't have the commit. I was calling the one that had the commit.
Now that the commit is removed from both procedures, my code seems to work now.