Develop Reference

Connecting to MongoDB using jdbc driver

Purpose is to connect MongoDB remote server through JAVA:
URL = "jdbc:mongo://" + serverIP + ":"
+ port+ "/" +databaseName;
Class.forName("mongodb.jdbc.MongoDriver");
dbConn = getConnection(URL,mongo1, mongo1);
Tried Unity_trial.Jar, mongo_version.jar files but the error comes is 'mongodb.jdbc.MongoDriver' classNameNotFound.
If I comment the class.forname line, the next error is
URL = "jdbc:mongo://" + serverIP + ":" + port
+ "/" +databaseName;
is not in correct format.
Not sure about where I am making the mistake.
Thanks for your help in advance.

You can checkout this project:
https://github.com/erh/mongo-jdbc
There are two examples given.
But in general I would recommend to use the MongoDB Client or some Spring Data abstraction.

If you are getting a ClassNotFoundException, the issue is that the jar containing the mongodb.jdbc.MongoDriver class is not on your classpath. If you're not sure what JAR this class is in, I would reccomend getting 7-Zip so that you can inspect the contents of the jar and see for yourself if the class is there.
The correct way to connect to MongoDB with your approach is:
Class.forName("mongodb.jdbc.MongoDriver");
String URL = "jdbc:mongo://<servername>:<port>/<databaseName>";
Connection jdbcConn = DriverManager.getConnection(url,"user","pass");
But MongoDB isn't really meant to be used with JDBC, so if your requirements allow, I would reccomend getting a connection the "mongodb" way.
MongoClient client = new MongoClient("localhost");
For details on how to do it this way, see the MongoDB docs

I know its very late to answer but might help someone else. If you are compiling and running your code from cmd then before compilation set classpath for mongo.jar like below :
set classpath=C:\DemoProject\java db\Mongo\mongo.jar;
then run your code.
or if you are using editor like eclipse then add this jar to your lib folder.

I met this question today morning.
The key is missing mongo-java-driver.jar.
when I add the jar, the project can run normal.

DbSchema database designer is providing an Open Source MongoDb JDBC driver which does support native MongoDb queries, including find(), projections, aggregate, etc..
The driver is using an internal embedded JavaScript engine.
The driver is Open Source on GitHub.
Few of the driver features:
Support native MongoDb queries
Calling DatabaseMetaData methods can 'guess' the collection structure, so a 'virtual schema' is created. This is used by the Designer for MongoDB to represent the MongoDb database structure in diagrams like below.
Implement most of the JDBC driver methods. Use the native MongoDB JDBC URL to connect, which means full functionality regarding connectivity.
And one snippet of code about how to use the driver
Class.forName("com.dbschema.MongoDbJdbcDriver");
Properties properties = new Properties();
properties.put("user", "someuser");
properties.put("password", "somepassword" );
Connection con = DriverManager.getConnection("jdbc:mongodb://host1:9160/keyspace1", properties);
// OTHER URL (SAME AS FOR MONGODB NATIVE DRIVER): mongodb://db1.example.net,db2.example.net:2500/?replicaSet=test&connectTimeoutMS=300000
String query = "db.sampleCollection().find()";
Statement statement = con.createStatement();
ResultSet rs = statement.executeQuery( query );
Object json = rs.getObject(1);

The first option
MongoClient mongoClient = new MongoClient( "1.2.3.4",27017 );
MongoDatabase database = mongoClient.getDatabase(dataBase);
MongoCollection<Document> collection = database.getCollection(DBcollection);
another option
MongoClientURI connectionString = new MongoClientURI("mongodb://1.2.3.4:27017");
MongoClient mongoClient = new MongoClient(connectionString);
MongoDatabase database = mongoClient.getDatabase(dataBase);
MongoCollection collection = database.getCollection(DBcollection);

How do I edit MS Access database using Java (NetBeans)

I'm trying to edit an MS Access database using some Java code (running NetBeans 7.2.1). I set up the data source and linked it to my database ProjectDatabase using the ODBC tool and named the data source DB, then i run the following code:
import java.sql.*;
public class NewMain {
public static void main(String[] args) {
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:DB");
Statement st=con.createStatement();
String name="roseindia";
String address="delhi";
int i=st.executeUpdate("insert into user(name,address) values('"+name+"','"+address+"')");
System.out.println("Row is added");
}
catch(Exception e){
System.out.println(e);
}
}
}
The code runs without and error and returns the "Row is added" message. The problem is that when I go back to view the database the changes have not taken effect. I have tried this with a code for deleting the data, also to no effect. Has anybody had this problem and knows how to solve it?
I'm running Windows 7 64-bit, Microsoft Office 64-bit with all the 64-bit drivers and I have been unable to find any mention of this problem through web searches.
Thanks in advance for any help =)

First of all you are not closing the connection, so that is one problem. Also change your code to:
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:DB");
Statement st=con.createStatement();
con.setAutoCommit(false); //Notice change here
String name="roseindia";
String address="delhi";
int i=st.executeUpdate("insert into user(name,address) values('"+name+"','"+address+"')");
con.commit(); //Notice change here
System.out.println("Row is added");
con.close(); //Notice change here
This will commit the changes to access database, so now you should be able to see data in MS Access.
Read here to know more about best practices for Closing and Releasing JDBC resources

Get table names from lotus notes database

I'm trying to write a program that would dump a whole lotus notes database to a file via NotesSQL driver. I'm connecting via jdbc:odbc and have
I can execute selects and get data from Lotus notes database
here is the code
try {
System.out.print("Connecting... ");
Connection con = DriverManager.getConnection("jdbc:odbc:NRC", "UserName", "Passw0rd1337");
System.out.println("OK");
DatabaseMetaData dmd = con.getMetaData();
String[] tableTypes = new String[] {"TABLE", "VIEW"};
ResultSet rs = dmd.getTables(null, null, "%", tableTypes);
ResultSetMetaData rsd = rs.getMetaData();
while (rs.next()) {
for (int i=1; i<=rsd.getColumnCount();i++)
System.out.println(i+" - "+rsd.getColumnName(i) + " - " + rs.getString(1));
}
con.close();
System.out.println("Connection closed");
} catch (Exception e) {
System.out.println(e);
}
And is there a better way to connect to Lotus notes databases via NotesSQL? Because with my code i get only null values for the names...

I know you are trying to use JDBC and NotesSQL. But, depending on your needs, and using Eclipse, you can access Notes databases natively via Java, which frankly is alot easier than trying to use JDBC, bit of a square peg in a round hole when you're using JDBC with Domino. Even if you don't have Lotus Notes installed on the host machine you can still write and deploy java applets and servlets to get into the data.
You will need to get the relevant Lotus Domino jar's though. So, my recommendation is an alternative approach to JDBC.
So, providing you have the Lotus Domino jar files in your Eclipse project you should be able to code any kind of extract from a view or even run adhoc searches on a database.
Setup
If this sounds like the direction you need to go, then firstly, have a look at setting up Eclipse with relevant Notes jar's here. There are only a few. (Sometimes you'll read about using CORBA and/or IIOP. Try avoid that, it's just a world of hurt).
Samples and snippets
This developer works article (although 6 years old) still works for Domino and is a sound foundation for the approach I am advocating. That article starts to address the initialization of the NotesFactory and Session classes to get you into the Notes API. More online help here for the NotesFactory class.
If you have a Lotus Notes client available you can have a look through code snippets here. A classic example for accessing documents via Views in Java can be found here.
After that you can easily access Views and documents with examples from here, and learn from the guru, (Bob Balaban), about memory management here.
If you're processing high volumes or running servlets, then memory management is important, otherwise don't stress about it too much. You can execute Native searches on a Notes database by writing it in formula, and then using the "search" methods to execute the query natively.
Iterating through documents or views ?
The easiest approach is to traverse documents via views and/or use "getdocumentByKey" methods to get a collection and work on that. In Domino "Views" are the equivalent of Tables. You can also get a list of Views via the Database.Views property
Native Queries
It's difficult to find definitive instructions on native queries for Notes, but I have managed to find it online here.

Use Database in java application

I am beginner in Java application programming.
I've created a database application in Java. I use an MS access database with the JDBC-ODBC driver. My application's create-connection code is below:
private void connection() {
try {
String driverurl = "jdbc:odbc:dharti_data";
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection(driverurl,"","");
} catch (SQLException e) {
JOptionPane.showMessageDialog(frm,e.getSQLState(),"Database Access Error",JOptionPane.ERROR_MESSAGE);
} catch (Exception e) {
JOptionPane.showMessageDialog(null,e.getMessage(),"Database Access Error",JOptionPane.ERROR_MESSAGE);
}
}
This code works perfectly, but this code uses a datasource name I declared in Control Panel > Administrative Tools > Data Sources (ODBC) > System DSN > Add Data Source, with a Microsoft Access Driver (*.mdb).
But when I run the application on another PC, it can't run and instead it generates a database error.
I know that I can declare a driver in Data Sources (ODBC) > System DSN, and then it will run. But I don't want to do this on every machine I run my application on. My application should be able to pick up the database connection automatically. How can I make my application not require a data-source name?

String filename = "C:/Lab/northwind.mdb"; // this the path to mdb file
String database = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=";
database+= filename.trim() + ";DriverID=22;READONLY=true}"; // add on to the end
// now we can get the connection from the DriverManager
Connection con = DriverManager.getConnection( database ,"","");

Im not sure if I got this, but are you shipping the jdbc driver along with your application? It has to be in your classpath and needs to be deployed with your application.

You will have to programmatically modify these registry sections:
HKEY_LOCAL_MACHINE\SOFTWARE\ODBC\ODBC.INI and
HKEY_LOCAL_MACHINE\SOFTWARE\ODBC\ODBC.INI\ODBC
Ice Engineering offer a public domain api that allows you to do that. Beside jars it has a DLL that you have to ship with your application. It is fairly straight forward and will work.
In order to get a better idea of what you have to do, use regedit in order to see the values before installing anything, then install an ODBC database manually, finally compare the new values with the old.

I used the sun.jdbc.odbc.JdbcOdbcDriver to connect to a MS Access database. Have that in the same directory as the class file and it should work. Although it should come already installed in the Java SDK.
This is a sample of a practice program I made a while ago.
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("Driver loaded");
// Establish a connection
Connection connection = DriverManager.getConnection
("jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=(MS ACCESS DATABASE DIRECTORY)");
System.out.println("Database connected");
// Create a statement
Statement statement = connection.createStatement();
// Execute a statement
ResultSet resultSet = statement.executeQuery
("select f_name, l_name from Test where f_name = 'Luke'"); // For example
// Iterate through the result and print the results
while (resultSet.next())
System.out.println(resultSet.getString(1) + "\t" + resultSet.getString(2) );

integrate ms access and mysql in java

I have a problem connecting to MS Access and MySQL using Java. My problem is that I cannot find the driver for MySQL. Here is my code:
<%# page import="java.sql.*" %>
<%
Connection odbcconn = null;
Connection jdbcconn = null;
PreparedStatement readsms = null;
PreparedStatement updsms = null;
ResultSet rsread = null;
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); //load database driver
odbcconn = DriverManager.getConnection("jdbc:odbc:SMS"); //connect to database
readsms = odbcconn.prepareStatement("select * from inbox where Status='New'");
rsread = readsms.executeQuery();
while(rsread.next()){
Class.forName("com.mysql.jdbc.Driver");
jdbcconn = DriverManager.getConnection("jdbc:mysql://localhost:3306/bakme", "root", ""); //connect to database
updsms = jdbcconn.prepareStatement("insert into inbox(sms,phone) values (?,?)");
updsms.setString(1, rsread.getString("Message"));
updsms.setString(2, rsread.getString("Phone"));
updsms.executeUpdate();
}
%>

Thus, you get a ClassNotFoundException on the MySQL JDBC driver class? Then you need to put the MySQL JDBC driver JAR file containing that class in the classpath. In case of a JSP/Servlet application, the classpath covers under each the webapplication's /WEB-INF/lib folder. Just drop the JAR file in there. Its JDBC driver is also known as Connector/J. You can download it here.
That said, that's really not the way how to use JDBC and JSP together. This doesn't belong in a JSP file. You should be doing this in a real Java class. The JDBC code should also be more robust written, now it's leaking resources.

BalusC is spot on: this is not the way you should write something like this.
Connection, Statement, and ResultSet all represent finite resources. They are not like memory allocation; the garbage collector does not clean them up. You have to do that in your code, like this:
// Inside a method
Connection connection = null;
Statement statement = null;
ResultSet rs = null;
try
{
// interact with the database using connection, statement, and rs
}
finally
{
// clean up resources in a finally block using static methods,
// called in reverse order of creation, that don't throw exceptions
close(rs);
close(statement);
close(connection);
}
But if you do decide to move this to a server-side component, you're bound to have huge problems with code like this:
while(rsread.next())
{
Class.forName("com.mysql.jdbc.Driver");
jdbcconn = DriverManager.getConnection("jdbc:mysql://localhost:3306/bakme", "root", ""); //connect to database
updsms = jdbcconn.prepareStatement("insert into inbox(sms,phone) values (?,?)");
updsms.setString(1, rsread.getString("Message"));
updsms.setString(2, rsread.getString("Phone"));
updsms.executeUpdate();
}
Registering the driver, creating a connection, without closing it, and repeatedly preparing a statement inside a loop for every row that you get out of Access shows a serious misunderstanding of relational databases and JDBC.
You should register the driver and create connections once, do what needs to be done, and clean up all the resources you've used.
If you absolutely MUST do this in a JSP, I'd recommend using JNDI data sources for both databases so you don't have to set up connections inside the page. You should not be writing scriptlet code - better to learn JSTL and use its <sql> tags.

You can use this link to download the MySql Driver. Once you download it, you need to make sure it is on the class path for the web server that you are using. The particulars of configuring JDBC drivers for a server vary from server to server. You may want to edit your question to include more details to get a better answer.