I'm having a problem, not sure how to fix:
connection code:
public class sqliteConnection {
Connection conn = null;
public static Connection dbConnector() {
try {
Class.forName("org.sqlite.JDBC");
Connection conn = DriverManager.getConnection("jdbc:sqlite:V:\\Database\\table.sqlite");
JOptionPane.showMessageDialog(null, "Conected to Database");
return conn;
}
catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
return null;
}
}
}
and where I'm using this connection:
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
try{
String sql="insert into test (test) value (?)";
PreparedStatement pst=conn.prepareStatement(sql);
pst.setString(1, Test.getText());
}catch (Exception e){
e.printStackTrace();
}
}
I'm getting a SQLITE_ERROR SQL error or missing database (near "value": syntax error) error, and I cant tell where the error could come from. I just created a test table in sqlite to test the connection, with one column which is a 'TEXT' named test. any help?
Related
I'm trying to connect to my DB using JDBC. I wanted to make a method for connection and another method for selecting data. I am getting a red line in Eclipse on the 'Connection con = connectDB();' part. ( See also attached) Cany anyone give me advice?
public class DBJdbc {
//Statement stmt = null;
// connecting to DB
public void connectDB() {
//Connection con = null;
try {
Class.forName("com.mysql.cj.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://****/SAC?useSSL=false&serverTimezone=UTC", "***", "***");
}
catch(SQLException e) {
e.printStackTrace();
}
catch(ClassNotFoundException e) {
e.printStackTrace();
}
}
// a method for selecting DB
public static void select() {
//connectDB();
String sql = "SELECT * from SAC_SUR";
try(Connection con = connectDB(); // I'm getting a red line here)
PreparedStatement pstmt = con.prepareStatement(sql)){
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(sql);
while(rs.next()) {
int id = rs.getInt(1);
String name = rs.getString(2);
System.out.println("Id = " + id + "name = " + name);
} //while
} catch(SQLException e) {
System.out.println(e.getMessage());
}
}
red line here!!!
connectDB() method is of void type and not returning anything but when you are calling the method, you are assigning it to variable con. So you need to change the return type of connectDb to the Connection type.
public Connection connectDB() {
Connection con = null;
try {
Class.forName("com.mysql.cj.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://****/SAC?useSSL=false&serverTimezone=UTC", "***", "***");
}
catch(SQLException e) {
e.printStackTrace();
}
catch(ClassNotFoundException e) {
e.printStackTrace();
}
return con;
}
You are trying to call non-static method into the static area, which is not allowed in Java. So I made this method static and returning the database connection.
Please update the below method into your code. It will resolve your problem.
public static Connection connectDB() {
Connection con = null;
try {
Class.forName("com.mysql.cj.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://****/SAC?useSSL=false&serverTimezone=UTC", "", "");
} catch(SQLException e) {
e.printStackTrace();
} catch(ClassNotFoundException e) {
e.printStackTrace();
}
return con;
}
i am new in database want to run first database program with Access but getting SQLException message "DB linking failed!"
i wrote following code with Java 8,and i have configured ucanaccess's libraries.
Java build path
<i>
import java.sql.*;
public class Db {
public static void main(String[] args)throws SQLException
{
Connection con =null;
try{
Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
String dataSource = "jdbc:ucanaccess://D:/Database.accdb";
con=DriverManager.getConnection(dataSource,"","");
Statement st = con.createStatement();
st.executeUpdate("INSERT INTO Table1 (ID, Name) VALUES ('4','ann')");
st.execute("SELECT * FROM Table1");
ResultSet rs = st.getResultSet();
while(rs.next())
{
System.out.println(rs.getString("ID")+rs.getString("Name"));
}
st.close();
con.close();
}
catch(SQLException e)
{
System.out.println("DB linking failed!");
} catch (ClassNotFoundException e) {
System.out.println("Driver loading failed!");
}
}
}
i have added "e.printStackTrace()" in the catch block as following
catch(SQLException e)
{
e.printStackTrace();
} catch (ClassNotFoundException e) {
System.out.println("Driver loading failed!");
}
and got following error messages
error messages
I've got a mysql question within java. I've got a mysql database with different tables. I currently got a database called 'litebans' and a table called 'litebans_mutes'.
Within that table there is a row called reason and under that reason (let's say what's within reason) there's a string called 'This is a test' and 'sorry'; how would I get the string 'This is a test' and 'sorry' associated with the same 'uuid' row in java? Here is a picture explaining more:
Here is an image explaining the sql format
Additionally, i've currently initialized all variables and such in java, i currently have this code:
http://hastebin.com/odumaqazok.java (Main class; using it for a minecraft plugin)
The below code is the MySQL class; api used to connect and execute stuff.
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import net.octopusmc.punish.Core;
public class MySQL {
public static Connection openConnection() {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e1) {
System.err.println(e1);
e1.printStackTrace();
}
try {
Connection conn = DriverManager.getConnection("jdbc:mysql://" + Core.host + ":" + Core.port + "/" + Core.database, Core.user, Core.pass);
System.out.println("Currently connected to the database.");
return conn;
} catch (SQLException e) {
System.out.println("An error has occured while connecting to the database");
System.err.println(e);
e.printStackTrace();
}
return null;
}
public static void Update(String qry) {
try {
Statement stmt = Core.SQLConn.createStatement();
stmt.executeUpdate(qry);
stmt.close();
} catch (Exception ex) {
openConnection();
System.err.println(ex);
}
}
public static Connection getConnection() {
return Core.SQLConn;
}
public static ResultSet Query(String qry) {
ResultSet rs = null;
try {
Statement stmt = Core.SQLConn.createStatement();
rs = stmt.executeQuery(qry);
} catch (Exception ex) {
openConnection();
System.err.println(ex);
}
return rs;
}
}
An example using that api above is shown below:
try {
ResultSet rs = MySQL.Query("QUERY GOES HERE");
while (rs.next()) {
//do stuff
}
} catch (Exception err) {
System.err.println(err);
err.printStackTrace();
}
tl;dr: I want to get the two fields called 'reason' with the give 'uuid' string field.
First , make sure that your using the jdbc mysql driver to connect to the database
Defile a class where you could write the required connection and create statement code.
For example
class ConnectorAndSQLStatement {
ResultSet rs = null;
public Statement st = null;
public Connection conn = null;
public connect() {
try {
final String driver = "com.mysql.jdbc.Driver";
final String db_url = "jdbc:mysql://localhost:3306/your_db_name";
Class.forName(driver);//Loading jdbc Driver
conn = DriverManager.getConnection(db_url, "username", "password");
st = conn.createStatement();
rs = st.executeQuery("Select what_you_want from your_table_name");
while (rs.next()) {
String whatever = rs.getInt("whatever ");
System.out.print(whatever);
}
} catch (SQLException se) {
se.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
Just call this function and the magic :D
Hope it is helpful
Hello guys so I have this simple java to do and I am trying to connect to an sqlite database from eclipse but it doesn't work at all.
Here is my code:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class DatabaseConnection {
private String pathDB="C:\\sqlite\\test.db";
private Connection connection=null;
private Statement statement=null;
public DatabaseConnection(String path){
pathDB= path;
}
public void connect () {
try {
Class.forName("org.sqlite.JDBC");
connection= DriverManager.getConnection("jdbc:sqlite:" + pathDB);
statement= connection.createStatement();
System.out.println("Connection to " + pathDB + " "+ "successful");
} catch (ClassNotFoundException notFoundException) {
notFoundException.printStackTrace();
System.out.println("Connection Error!");
} catch (SQLException sqlException) {
sqlException.printStackTrace();
System.out.println("Connection Error!");
}
String query="Insert into Identity values(0,'issam','issam#mail.com')";
try {
statement.executeUpdate(query);
} catch (SQLException e) {
e.printStackTrace();
}
}
public void close() {
try {
connection.close();
statement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
And the main class:
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
DatabaseConnection connection= new DatabaseConnection("test.db");
connection.connect();
connection.close();
}
}
So I have this sqlite database but whenever I run the code it always gives me : Connection to "path" was successful, no matter what path I put...
I think I have done everything correctly, I downloaded the sqlite JDBC file and added it:
enter image description here
I tried adding a new row to a database table, but it always gives me this:
Connection to test.db successful
java.sql.SQLException: no such table: Identity
at org.sqlite.core.NativeDB.throwex(NativeDB.java:397)
at org.sqlite.core.NativeDB._exec(Native Method)
at org.sqlite.jdbc3.JDBC3Statement.executeUpdate(JDBC3Statement.java:116)
at com.issam.iamcore.DatabaseConnection.connect(DatabaseConnection.java:41)
at com.issam.iamcore.Main.main(Main.java:10)
java.sql.SQLException: [SQLITE_ERROR] SQL error or missing database (Connection is closed)
at org.sqlite.core.DB.newSQLException(DB.java:890)
at org.sqlite.core.CoreStatement.internalClose(CoreStatement.java:109)
at org.sqlite.jdbc3.JDBC3Statement.close(JDBC3Statement.java:35)
at com.issam.iamcore.DatabaseConnection.close(DatabaseConnection.java:63)
at com.issam.iamcore.Main.main(Main.java:11)
Any help would be appreeciated, thanks !
You have successfully connected to the database, but did not create table Identity before executing insert query, as it says in the stack trace:
Connection to test.db successful
java.sql.SQLException: no such table: Identity
Call this before inserting a row:
String createQuery = "CREATE TABLE Identity (id INT PRIMARY KEY NOT NULL, name TEXT, email TEXT)";
statement.executeUpdate(createQuery);
Following is my Java code. In linux, it is working fine but in Windows I'm unable to insert data into the database on local disk. In NetBeans get it all right but .jar file not. JDBC driver see be good.
Connecting to database:
public static Connection connectToDb() {
try {
Connection connection = null;
DriverManager.registerDriver(new org.sqlite.JDBC());
//LINUX PATH
if (OSDetector.isLinux()) {
connection = DriverManager.getConnection("jdbc:sqlite:/home/" + userNameLinux + "/PDFMalwareDataAnalyser/DatabaseSQLite/database.db", NAME, PASSWORD);
//WINDOWS PATH
} else {
connection = DriverManager.getConnection("jdbc:sqlite:C:\\PDFMalwareDataAnalyser\\DatabaseSQLite\\database.db", NAME, PASSWORD);
}
connection.setAutoCommit(true);
if (connection != null) {
System.out.println("Otvorená.");
}
return connection;
} catch (SQLException e) {
System.err.println(e.getClass().getName() + e.getMessage());
// System.exit(0);
}
return null;
}
Insertion:
public void insertDataToDatabase(int idReport) throws SQLException {
connection = new SQLiteJDBC().connectToDb();
PreparedStatement insertCommunication = connection.prepareStatement("insert into table_communication values(?,?);");
insertCommunication.setString(2, communicationsFinal.toString());
try {
insertCommunication.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
}
insertCommunication.close();
connection.close();
System.out.println("1. --- Insert do tabuľky TABLE_COMMUNICATION OK ---");
}
Try this:
connection = DriverManager.getConnection("jdbc:sqlite:C:/PDFMalwareDataAnalyser/DatabaseSQLite/database.db")