Develop Reference

Unable to connect to Azure using JDBC (based upon the connection string and samples provide) due to SSL issue

Am getting the following error: com.microsoft.sqlserver.jdbc.SQLServerException: The driver could not establish a secure connection to SQL Server by using Secure Sockets Layer (SSL) encryption. Error: "Connection reset by peer: socket write error."
import java.sql.*;
import com.microsoft.sqlserver.jdbc.*;
public class SQLDatabaseConnection {
// Connect to your database.
// Replace server name, username, and password with your credentials
public static void main(String[] args) {
String connectionString =
"jdbc:sqlserver://XXXXX.database.windows.net:1433;"
+ "database=VDB;"
+ "user=XXX#VVV;"
+ "password=XXXX;"
+ "encrypt=true;"
+ "trustServerCertificate=false;"
+ "hostNameInCertificate=*.database.windows.net;"
+ "loginTimeout=30;";
// Declare the JDBC objects.
Connection connection = null;
Statement statement = null;
ResultSet resultSet = null;
try {
// Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
connection = DriverManager.getConnection(connectionString);
// Create and execute a SELECT SQL statement.
String selectSql = "SELECT TOP 2 * from Application";
statement = connection.createStatement();
resultSet = statement.executeQuery(selectSql);
// Print results from select statement
while (resultSet.next()) {
System.out.println(resultSet.getString(2) + " "
+ resultSet.getString(3));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// Close the connections after the data has been handled.
if (resultSet != null) try {
resultSet.close();
} catch (Exception e) {
}
if (statement != null) try {
statement.close();
} catch (Exception e) {
}
if (connection != null) try {
connection.close();
} catch (Exception e) {
}
}
}
}
I'm only trying to do the "sample" connection snippet of code as referenced on the Azure site (which points to a MS entry), modified only to match my db and test table but without success.
Having reviewed all there is to know, I have:-
ensured that I'm using the right sqljdbc (I've tried all 4)
have the sqlauth.dll on the CLASSPATH
have set the sample up EXACTLY as shown; and incorporated the string that Azure offers.
I have tried various combinations of encrypt and trust without success. As I'm a newbie to Java and Azure, I'm reluctant and unsure how to fiddle with the JVM security settings.
I've proven that my machine can talk to the Azure database (through a VB ODBC connection); and I've tested with the firewall down.
Any thoughts?

I tried to reproduce the issue, but failed that I could access my SQL Azure Instance using the code which be similar with yours.
The difference between our codes is only as below, besides using the connection string of my sql azure instance.
Using the driver sqljdbc4.jar from the sqljdbc_4.0 link.
Using the code Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); to load MS SQL JDBC driver.
Not adding the sqlauth.dll file into the CLASSPATH.
Check my client IP which has been allowed by SQL Azure IP firewall.
Using the sql select 1+1 to test my code, and get the value 4 from code result.getInt(1).
That's fine for me. If you can supply more detals for us, I think it's very helpful for analysising the issue.
Hope it helps.

How do I perform a simple email/password verification in JSP using a SQL database?

I have the code that successfully establishes a connection to a mySQL database.
String email, password; //assume these are already loaded with user-entered data.
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
return false;
}
Connection conn = null;
try {
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/main", "root", "password123");
} catch (SQLException e) {
return false;
}
//perform my database actions here///////////////
///////////////////////////////////////////////////
try {
conn.close();
} catch (SQLException e) {
return false;
}
I have a couple of strings in the scope of the code above that already have the email and password entered by a user on a login page. I need to look through the database for a matching email address and then verify that the password matches what the user entered in the form.
My table has 3 columns: id, email, and password.
I have pushed two rows into the table using the sql workbench
1 | email#gmail.com | password1
2 | email2#gmail.com | password2
I'm assuming in pure SQL I have to do something like
SELECT * FROM users WHERE email LIKE 'email#gmail.com' AND password LIKE 'password1';
But I'm not quite sure how to actually send these SQL commands to the database and receive info back using JSP. Also, I'm not entirely sure my SQL logic is the ideal way to verify a password. My thinking with the SQL command above was that if the database finds any row that meets the conditions, then the email/password combination are verified. Not sure if this is a great way to do it though. I'm not looking for the most secure and complicated way, I'm just looking for the simplest way that makes sense at the moment. Every tutorial I find seems to do it differently and I'm a bit confused.

Here's an example you can use from something I've worked on (I'm assuming that the connection "conn" is obvious):
PreparedStatement st = null;
ResultSet rec = null;
SprayJobItem item = null;
try {
st = conn.prepareStatement("select * from sprayjob where headerref=? and jobname=?");
st.setString(1, request.getParameter("joblistref"));
st.setString(2, request.getParameter("jobname"));
rec = st.executeQuery();
if (rec.next()) {
item = new SprayJobItem(rec);
}
} catch (SQLException ex) {
// handle any errors
ReportError.errorReport("SQLException: " + ex.getMessage());
ReportError.errorReport("SQLState: " + ex.getSQLState());
ReportError.errorReport("VendorError: " + ex.getErrorCode());
} catch (Exception ex) {
ReportError.errorReport("Error: " + ex.getMessage());
} finally {
// Always make sure result sets and statements are closed,
if (ps != null) {
try {
ps.close();
} catch (SQLException e) {
;
}
ps = null;
}
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
;
}
rs = null;
}
}
In your case instead of item = new SprayJobItem(rec);
you would have code that notes that the user is valid as the record has been found.

Insert Data In Oracle DataBase

//in context listener
Statement stmt;
try {
Class.forName("oracle.jdbc.OracleDriver");
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:#127.0.0.1:1521:orcl","abc", "abc");
stmt = conn.createStatement();
sce.getServletContext().setAttribute("stmt", stmt);
} catch (ClassNotFoundException e) {
} catch (SQLException e) {
}
//in Servlet page
try {
Statement stmts=(Statement) getServletContext().getAttribute("stmt");
stmts.executeUpdate("INSERT INTO COMPANYS values(1,'ahmed',5,'t012','t345','email#eamil','adressadress')");
System.out.println("connection succeed");
} catch (SQLException e) {
System.out.println("connection fail");
}
in Servlet page "try code" is execute and "connection succeed" is appearing but in oracle database there is no data inserted >> why???

use con.setAutoCommit(false); after conn has created. Once the transaction completes i.e.,after executeUpdate(...) call con.commit(); It will solve your issue if their are no errors displayed on the console.

Try it again with below steps
Set auto commit as false
Commit after updating the record to make it persisted in the database
Rollback if there is any exception while inserting the record
Don't forget to clean-up the environment such as ResultSet, Statement etc.
Code in finally block to close the resources
Don't keep connection opened for long time.
Must read
Is it mandatory to close all ResultSets, Statements and Connections?
Java Tutorial - Using Transactions
Find a sample code HERE with detailed inline comments.

MySQL DATA Truncation Error occuring from Java application but not directly on MySQL

I am using the JDBC driver to connect to a mysql database and using the "LOAD DATA INFILE" command in my java application to load(insert) a text file into the database. I am getting the following error: Data truncation: Data too long for column xxx at row 1.
However if I load the same text file manually by logging into the database and entering the SQL manually, the data loads fine.
Can someone pelase tell me what the error might be?
I am running this on Red Hat Enterprise Linux Server release 5.8 and the jdk version is 1.5.0_16 if that helps
This is the function used to load the data
public static void loaddata(Connection conn, String filename, String tablename)
{
try{
Statement stmt = null;
stmt = conn.createStatement();
File file = new File(filename);
file.getAbsolutePath().replace("\\", "\\\\");
String cmd = "LOAD DATA INFILE '"
+ file.getAbsolutePath().replace("\\", "\\\\")
+ "' INTO TABLE " + tablename + " FIELDS TERMINATED BY \'^\'";
stmt.executeUpdate(cmd);
System.out.println("cmd :" + cmd);
}
catch(SQLException sqle){
sqle.printStackTrace();
}
}
This is the function to create the JDBC connection:
public static Connection createConnection()
{
Connection conn=null;
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
}
catch(Exception e) {
e.printStackTrace();
}
try {
String url = ""; //URL mentioned in the actual code
conn = DriverManager.getConnection(url, user, pass);
} catch (SQLException sqe1) {
sqe1.printStackTrace();
}
return conn;
}

MySql database connection issues in play framework (driver not found)

So I have tried using the stock Play! 2.2 configuration for the MySql database connection. Unfortunately the guides out there are less than helpful when using the stock database (h2) alongside a MySql. SO, I coded a separate model to handle the MySql connection. It works intermittently, and I'm trying to figure out why it doesn't work all of the time.
this is the "connect" function
String sourceSchema = "db";
String databaseHost = "host";
String databaseURLSource = "jdbc:mysql://" + databaseHost + "/" + sourceSchema;
String databaseUserIDSource = "userid";
String databasePWDSource = "password";
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
conn = DriverManager.getConnection(databaseURLSource,
databaseUserIDSource, databasePWDSource);
return true;
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
Logger.error("SQLException: " + e.getMessage());
}
All of my credentials are correct (here obviously they are changed) Next, in my lib folder, I have the
mysql-connector-java-5.1.21-bin.jar
in place.
Next, in my Build.scala, I have this under appDependencies:
"mysql" % "mysql-connector-java" % "5.1.21"
when I try to validate the connection, using:
public boolean isConnected() {
return conn != null;
}
The connection fails (intermittantly) and then gives me:
SQLException: Before start of result set
and sometimes:
SQLException: No Suitable driver found for mysql ...
This is how my query is executed:
String qs = String.format("SELECT * FROM community_hub.alert_journal LIMIT("+ from +","+ to +")");
String qscount = String.format("SELECT COUNT(*) AS count FROM community_hub.alert_journal");
try {
if (isConnected()) {
Statement stmt = conn.createStatement();
//obtain count of rows
ResultSet rs1 = stmt.executeQuery(qscount);
//returns the number of pages to draw on index
int numPages = returnPages(rs1.getInt("count"),rpp);
NumPages(numPages);
ResultSet rs = stmt.executeQuery(qs);
while (rs.next())
{
AlertEntry ae = new AlertEntry(
rs.getTimestamp("date"),
rs.getString("service_url"),
rs.getString("type"),
rs.getString("offering_id"),
rs.getString("observed_property"),
rs.getString("detail")
);
list.add(ae);
}
rs.close();
disconnect();
} else {
System.err.println("Connection was null");
}
}
catch (Exception e)
{
e.printStackTrace();
}
Help?
Thanks!

does the mysql error tell you anything?
the first error "SQLException: Before start of result set" looks like its incomplete. Maybe the error log contains the full message or you can
the second one "SQLException: No Suitable driver found for mysql" clearly indicates a classpath issue.
usually connection pools like c3p0 or BoneCP recommed to use a validation query to determine if a connection is valid (something like "select 1" for mysql). That may help to make sure the connection is ok and not rely on the driver?