I'm setting up a web API. My program.cs file looks like this:
var serverVersion = new MySqlServerVersion(new Version(8, 0, 29));
builder.Services.AddDbContext<GameDbContext>(
dbContextOptions => dbContextOptions
.UseMySql(builder.Configuration.GetConnectionString("Db"), serverVersion, mySqlOptions =>
mySqlOptions.EnableRetryOnFailure(
maxRetryCount: 10,
maxRetryDelay: TimeSpan.FromSeconds(30),
errorNumbersToAdd: null))
);
And my connection string has the following template:
"ConnectionStrings": {
"Db": "Server=serverIP,port;Database=dbName;User Id=userId;Password=password;"
}
The API ill listen on localhost:7272 when building and running the project in Visual Studio itself. The API will handle the requests sent to this adress.
However, when I build and publish the project and then run the executable from the folder, it listens to localhost:5000, but no requests will be handled because of this error:
An error occurred using the connection to database '' on server ''.
I've already added the 'EnableRetryOnFailure' as suggested by others and changed the template of the connection string multiple times but still to no avail.
What can I do to fix this?
Thanks!
I've already added the 'EnableRetryOnFailure' as suggested by others and changed the template of the connection string multiple times but still to no avail. I also added the Pomelo package.
Related
I have a project that included 3 windows services, the services were worked very well, then for business needs, we need to move from windows server 2008 to windows server 2019.
The issue which I faced is:
When I install the services, It didn't start and returned the error in the Event Viewer:
Service cannot be started. System.Security.SecurityException: The source was not found, but some or all event logs could not be searched. Inaccessible logs: Security, State.
I searched for this issue and I found a lot of answers ( like this) but it won't help me.
I installed the services in Command Line as administrator using InstallUtil.exe.
Then opened the Registry Editor and give the user NETWORK SERVICE a full control in the path as below:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\eventlog\Application
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\eventlog\Security
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\eventlog
Then I check the subkey of the services in the path:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventLog\Application
Also, it exists.
My code related to EventLog :
public class EventViewer
{
public static void WriteEvent(string ServiceName, string msg, EventLogEntryType _EventLogEntryType)
{
EventLog eventLog = new EventLog();
eventLog.Source = ServiceName;
eventLog.Log = "Application";
((System.ComponentModel.ISupportInitialize)(eventLog)).BeginInit();
if (!EventLog.SourceExists(eventLog.Source))
{
EventLog.CreateEventSource(eventLog.Source, eventLog.Log);
}
((System.ComponentModel.ISupportInitialize)(eventLog)).EndInit();
eventLog.WriteEntry(msg, _EventLogEntryType);
}
}
The Event Viewer give me the line of the exception and it refers to:
((System.ComponentModel.ISupportInitialize)(eventLog)).BeginInit();
I tried to debug the service on my machine using Visual Studio 2019, but also give me the same error, and the service wouldn't start to debug using "Attach to Process".
I think the issue is while scanning the registry to check if the event source exist.
https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventlog.createeventsource?view=dotnet-plat-ext-6.0
As per Microsoft the account requires administrative privilege to do this task.
I have also seen there is a new registry hive under 'EventLog' called 'state' in windows 2019 which has less access compared to other hives.
Debug with process monitor and see if you are getting access denied in that hive.
I have built Poco 1.11 and am unable to get secure SMTP connections, or HTTPS connections in general, to work, with the NetSSL_Win module (i.e. using Windows Schannel rather than OpenSSL). There is a sample in the distribution at NetSSL_Win\samples\Mail\src :
SecureSMTPClientSession session(mailhost);
session.login();
session.startTLS(pContext);
if ( !username.empty() )
{
session.login(SMTPClientSession::AUTH_LOGIN, username, password);
}
session.sendMessage(message);
session.close();
When I run it, the second login() call, after the startTLS() call, throws this error:
SSL Exception: Failed to decode data: The specified data could not be decrypted
The server in this case was smtp.gmail.com, on port 587.
I get the same error message for any other HTTPS client code I try to run as well.
Is anyone successfully using Poco 1.11 for HTTPS connections, using Windows Schannel?
I want to build a simple app that connects to remote MySQL server. However, I can't make it work.
import ballerina/io;
import ballerina/jdbc;
import ballerina/mysql;
endpoint jdbc:Client jiraDB {
host: "jdbc:mysql://DB-SERVER:3306/jira",
username: "jira",
password: "PWD",
poolOptions: { maximumPoolSize: 5 }
};
type Domain record {
string domain,
string jira,
};
function main(string... args) {
var ret = jiraDB->select("SELECT * FROM `domains`", ());
table domainTable;
match ret {
table tableReturned => domainTable = tableReturned;
error e => io:println("Select data from domains table failed: " + e.message);
}
while(domainTable.hasNext()) {
var domain = <Domain>domainTable.getNext();
match domain {
Domain d => io:println("Domain: " + d.domain);
error e => io:println("Error in get employee from table: "
+ e.message);
}
}
}
The structure of MySQL is not really important. I think it has to do with missing / wrongly used JDBC/MySQL library.
Do you please have any ideas how to make it work on Mac OS X ?
$ ballerina run hello.bal
error: ballerina/runtime:CallFailedException, message: call failed
at ..<stop>(hello.bal:5)
caused by error
at ballerina/jdbc:stop(endpoint.bal:66)
I'm using latest Mac OS X with:
$ ballerina --version
Ballerina 0.980.1
First, the latest ballerina version is 0.981.0. It would be great if you could use the latest version since it would include latest bug fixes and improvements.
In Ballerina, there is a generic jdbc client which can be used to connect to any database which has a jdbc driver. In addition, for mysql and h2 there are two clients implemented specifically for those two databases.
When connecting to mysql, you could either use the generic jdbc client or the mysql specific client. The recommendation is to use the mysql specific client.
In your code snippet, I can see you are using jdbc client. As Anoukh mentioned above, the endpoint configuration is incorrect.
Following is a sample configuration for generic jdbc client endpoint.
endpoint jdbc:Client testDB {
url: "jdbc:mysql://localhost:3306/testdb",
username: "user1",
password: "pass1",
poolOptions: { maximumPoolSize: 5 }
};
And following is a sample configuration of mysql client endpoint.
endpoint mysql:Client testDB {
host: "localhost",
port: 3306,
name: "testDB",
username: "user1",
password: "pass1",
poolOptions: { maximumPoolSize: 5 }
};
In order to use either of the clients, you need to copy the mysql jdbc driver to ${BALLERINA_HOME}/bre/lib.
Even after correcting your configuration and copying the driver, if you still face the issue, please check whether file named ballerina-internal.log is created where you are running your bal file and share. Also please share the mysql database and driver version you are using.
Have you copied the MySQL JDBC driver to the BALLERINA_HOME/bre/lib folder?
You can find the ballerina home using which ballerina command.
You can download the mysql jdbc driver from http://central.maven.org/maven2/mysql/mysql-connector-java/5.1.6/mysql-connector-java-5.1.6.jar
The issue might be in the jiraDB endpoint configurations. As per the API docs, the config for the URL of the database is to be given as url instead of host.
I was not able to connect to Mysql and I faced a driver instance error. I solved it! I'm not sure to post my answer at the good place but I think it will be a good resource to fix some problems with Mysql connections issues in Ballerina.
In my terminal : echo $BALLERINA_HOME
/Library/Ballerina/ballerina-0.990.2
Copy the good jar in the right place !
Go to : http://central.maven.org/maven2/mysql/mysql-connector-java/
I have downloaded the latest stable version (at the time of writing 8.0.15).
Copy the jar in $BALLERINA_HOME/bre/lib/
I had an error with a prior version.
Be careful that your jar have the right extension (the .jar not the repository with the same name).
Also be sure to have fulfilled the recommandations (see the doc of Oracle when installing a jar, i.e setting the classpath)
In your terminal, set the class path :
export CLASSPATH=$CLASSPATH:/Library/Ballerina/ballerina-0.990.2/bre/lib/mysql-connector-java-8.0.15
Then it will work !
In my Node.js app, I am trying to connect to a MySQL database hosted on Amazon.
$ npm install mysql
My code looks something like this:
var mysql = require('mysql');
var connection = mysql.createConnection({
host : 'my amazon sql db',
user : 'me',
password : 'secret',
database : 'my_db'
});
connection.connect();
connection.query('SELECT 1 + 1 AS solution', function(err, rows, fields) {
if (err) throw err;
console.log('The solution is: ', rows[0].solution);
});
connection.end();
I can connect to my MySQL DB using Workbench--therefore, I am pretty sure my credentials are okay.
When I attempt to connect I get the following error:
Connection.js:91 Uncaught TypeError: Net.createConnection is not a function
Debugging the code from the npm library--this is where the error is thrown in connection.js:
this._socket = (this.config.socketPath)
? Net.createConnection(this.config.socketPath)
: Net.createConnection(this.config.port, this.config.host);
The connection.js has a dependency :
var Net = require('net');
I am running Node.js locally on my Windows computer.
Can anyone tell me what could be causing this error?
Created a separate ticket:
Error thrown calling Node.js net.createConnection
The net module required and used in the MySQL node module is a core part of Node.js itself. The error you're getting about Net.createConnection not being a function means it's coming up as an empty object and the error is related to one of your comment to the question:
I am testing my code within a browser.
You must run this particular module on Node.js only, you can't run it in a web browser.
One could think a possibility would be to run your code through a packer like browserify or webpack so you can easily require('mysql') in your browser but it won't work. The net module which is a core dependency of the mysql module will be transformed into an empty object {}.
That's not a bug, it's how it's supposed to work. Browsers don't have generic tcp implementations so it can't be emulated. The empty object is intended to prevent require('net') from failing on modules that otherwise work in the browser.
To avoid this error, you need to run this code in a pure Node.js environment, not in a browser. A simple server could serve this purpose since this code in your client in a browser can't work and would add a security hole as everything client-side is manipulative and as such not secure. You don't want to expose your database on the client-side but only consumes it.
I followed the steps trying to configure MySQL in WildFly. I have two questions for your help with:
1) I downloaded the mysql-connector-java-5.1.33-bin.jar and placed it under modules/system/layers/base/com/mysql/main/. Do I need to download the actual MySql? Or the connector jar is sufficient?
2) In creating a new data source in WildFly console, I was not able to create a new data source. Part of the information I need to fill in is a pair of user name and password to access the database. Where should I create this user name and password first? I am guessing this is where I got the problem from.
I got this error message when testing the connection in wildfly console:
Unexpected HTTP response: 500
Request
{
"address" => [
("subsystem" => "datasources"),
("data-source" => "mysqlDSPool")
],
"operation" => "test-connection-in-pool"
}
Response
Internal Server Error
{
"outcome" => "failed",
"failure-description" => "JBAS010440: failed to invoke operation: JBAS010447: Connection is not valid",
"rolled-back" => true
}
first you need to install Mysql server and a JDBC 4-compliant driver, normally all new JDBCs provided by Mysql.org are JDBC 4-compliant, find a platform independant one here, then you need to add a datasource here in this file standalone/configuration/standalone.xml or using this command
data-source add --name=myDataSource--jndi-name="java:jboss/datasources/myDataSource" \
--connection-url="jdbc:mysql://localhost:3306/myDB" \
--driver-name=h2 --user-name="myDB_Username" --password="myPassword"
username and password are those used to connect to Mysql database.
1) You need to download the jdbc-driver jar which, I think, is the connector jar. But please don't place it under modules/system/... but directly under modules since the system folder is reserved for internal modules that are delivered with the server.
2) Here is an example (configures an Oracle datasource):
/subsystem=datasources/jdbc-driver=OracleJdbcDriver:add(driver-module-name=oracle.jdbcaq,driver-name=OracleJdbcDriver)
/subsystem=datasources/data-source=OracleDS:add(jndi-name=java:jboss/datasources/OracleDS,enabled=true,jta=true,use-java-context=true,connection-url=jdbc:oracle:oci:#dbms:1523/DEV,driver-name=OracleJdbcDriver,min-pool-size=5,max-pool-size=100,user-name=username,password=password,prepared-statements-cache-size=100,exception-sorter-class-name=org.jboss.jca.adapters.jdbc.extensions.oracle.OracleExceptionSorter)