I want to make a connection to an Oracle database and I have found the following method in the docs:
https://docs.atoti.io/latest/lib/atoti.store.html?highlight=jdbc#atoti.store.Store.load_sql
I call this method with something like this: my_store.load_sql(url, query, username=my_username, password=my_password)
And I use a URL with this form: 'jdbc:XX.XX.XX.XX:YYYY/ZZZZ', but I get the following error:
ValueError: No driver provided and cannot infer it from URL.
I also created this config with a path to a jdbc jar file in my SQL Developer folder, but the error persists:
my_jdbc = 'ojdbc8.jar'
tt.config.create_config(extra_jars = my_jdbc)
Does anyone know how I can solve it or have any example of loading stores from an Oracle database?
Thanks in advance.
The atoti-sql plugin comes with the Oracle driver so you don't need to add an extra jar to the config. However you do need to pass the driver when calling my_store.load_sql. These can be found in the atoti_sql.drivers module.
In your case since you are using an Oracle database, the correct code should be something like:
my_store.load_sql(
url,
query,
username=username,
password=mypassword,
driver=atoti_sql.drivers.ORACLE
)
Related
I've written a CodeName One application in NetBeans and I'm testing via the Simulator.
I have a local SQLite database and can execute a simple query in my application e.g.
SELECT *
FROM tempJSON;
When I try to introduce a function (e.g. json_tree) from the JSON1 Extension (https://www.sqlite.org/json1.html) e.g.
SELECT j.value
FROM tempJSON AS d
JOIN json_tree(d.textJSON) AS j
WHERE j.key = 'RunnerName';
I receive the following error.:
java.io.IOException: [SQLITE_ERROR] SQL error or missing database (near "(": syntax error)
Note: both queries execute successfully in SQLiteStudio
What am I missing? (e.g. a configuration issue)
Or is this not possible (yet)?
You can't use extensions in the standard SQLite. On the device we use the builtin sqlite versions and they differ a bit between iOS/Android so relying on an extension that might not be there is problematic.
As a solution we did this: https://www.codenameone.com/blog/spatial-pluggable-sqlite.html
This was done for spatial extensions but the concept is identical if you want to support JSON extensions: bundle your own copy of sqlite.
I build a simple weka application using Weka 3.7.13 dev version using MAVEN. I have initialise the pom.xml function to get weka library from the repository.
i want to run a simple clustering algorithm using weka, and connecting it to MySQL database. As per documentation, the weka need to have a DatabaseUtil.props file which contains it's jdbc driver. I have setup that.
This is my project structure:
I can retrieve the DatabaseUtils.props using my code below. But somehow the weka itself cannot recognise the jdbc:Url and driver name which i already configure inside.
DatabaseUtil.props file:
# JDBC driver (comma-separated list)
jdbcDriver=com.mysql.jdbc.Driver
# database URL
jdbcURL=jdbc:mysql://127.0.0.1:3306/datamining
Java code which i trigger the Weka module:
public void dm(){
int cluster = 4;
InstanceQuery clusterQuery = null;
try{
//file reader of database utilities properties
ClassLoader classLoader = getClass().getClassLoader();
File fileProps = new File(classLoader.getResource("DatabaseUtils.props").getFile());
//setup the data preparation functionality then connect to database
clusterQuery = new InstanceQuery();
clusterQuery.setUsername("test");
clusterQuery.setPassword("test");
clusterQuery.setQuery("SELECT * FROM TEMP_KMEANS");
clusterQuery.setCustomPropsFile(fileProps);
But when executed the function returning error: java.sql.SQLException: No suitable driver found for jdbc:idb=experiments.prp
It seems that the DatabaseUtils.props file cannot override the default driver value jdbc:idb=experiments.prp
Any ideas why this is throwing?
Any feedback and answer much appreciated.
I created a DatabaseUtils.props file in the src / main / resources folder and wrote the following code. It worked for me, I'm using weka 3.8.0.
File file = new File(getClass().getClassLoader().getResource("DatabaseUtils.props").toURI());
InstanceQuery query = new InstanceQuery();
query.setCustomPropsFile(file);
query.setUsername(MYSQL_USER);
query.setPassword(MYSQL_PASSWORD);
query.setQuery("select * from Action");
instances = query.retrieveInstances();
System.out.println(instances.toString());
The documentation says "These may be changed by creating a java properties file called DatabaseUtils.props in user.home or the current directory". Your properties file does not match those requirements (a properties file in a jar is not on the filesystem). See also Chapter 14 of the Weka manual.
An alternative solution is to set the URL in code using setDatabaseURL. As long as the JDBC driver is on the classpath this should work.
I'd like to customize database connection in Pylons application.
I'm interested in changing these arguments:
pool_size
pool_recycle
In SqlAlchemy the arguments are passed to *create_engine* call, like here:
http://docs.sqlalchemy.org/en/rel_0_9/core/engines.html?highlight=pool_size#sqlalchemy.create_engine
How can I change those params in Pylons?
you should be able to do it right in your ini file, it's been a while since I did pylons but IIRC, assuming you said yes to the sqlalchemy question when you created the project, all items prefixed with "slqalchemy." are given as keywords to the engine_from_config method in sqlalchemy. see the config/environment.py file for more.
sqlalchemy.url=<your db connection info>
sqlalchemy.pool_size= ??
sqlalchemy.pool_recycle= ??
I am working on asp.net mvc with EF code first model. I am trying to apply migrations using EF code first to my project. I am using MySql database. currently i am using EF 4.3.1 version and mysql connector/.net of 6.6.4.0 version. I am successfully add migrations to my project that means i execute series of commands that gave no errors for me. I have followed these steps,
PM> Enable-Migrations
PM> Add-Migration InitialMigration
PM> update-database -verbose
these steps create Migration folder to my project and inside Migration folder it creates configuration and timestamp_Initialmigration files, in configuration file i have added following code.
SetSqlGenerator("MySql.Data.MySqlClient", new MySql.Data.Entity.MySqlMigrationSqlGenerator());
after that i have added one field to my class like,
public int newprop{get; set;}
after that i execute update-database -verbose command in PM console.
when i execute my application it throws an error like,
"Unknown column 'Extent1.newprop' in 'field list'"
please guide me why i am getting this error does i went to the wrong way please guide me.
If your not using automatic migrations
Database.SetInitializer(new MigrateDatabaseToLatestVersion());
public class MyMigrationConfiguration : DbMigrationsConfiguration<MyDbContext>
{
public MyMigrationConfiguration()
{
AutomaticMigrationsEnabled = true; // Are you using this ?????
AutomaticMigrationDataLossAllowed = true;
}
}
Then you need to tell EF using the PM Commandlet to add another migration and update the database.
PM> Enable-Migrations //already done this ?
PM> Add-Migration myLabel
PM> Update-Database
Search for "code based migrations" on web for help
This is a bit late to answer OP... But since it pops up as my first hit on google, ill go ahead anyways :)
The problem here is, that there are a number of restrictions on MySQL as compared to MSSQL.
* In particular with mysql on casesensitive filesystems (linux hosts), table names may not include capitalized letters.
* Also keys are restricted to 767 bytes and should/must be integer types.
* Then there is a problem in parts of the migration generators from Mysql.Data package. For instance when renaming, 'dbo' is not stripped away.
Have a look at this guide on insidemysql.com. It describes how to reconfigure the Aspnet.Identity stack for using int in the TKey typecast.
I have a project where i also have hooked into HistoryContext, allowing to alter structure of __MigrationHistory. It renames and resizes the table/columns. There's also the remake of IdentityConfig - so have a look at
https://github.com/mschr/ASP.NET-MVC5.MySql-Extended-Bootstrap/tree/master/my.ns.entities/DbContexts/MigrationConfig
https://github.com/mschr/ASP.NET-MVC5.MySql-Extended-Bootstrap/tree/master/my.ns.entities/IdentityConfig
Then hook it up with your context (see IdentityDbContext) and enable the mentioned MySqlMigrationScriptGenerator and HistoryContextFactory in your Migrations.Configuration class (see my IdentitiyMigrations.Configuration)
I've finished building my blog using EF and Code First.
EF was running against my local SQL Express instance, with [DBO] schema.
Now i want to publish the blog, and i have done the following :
Generetade the scripts for the tables and all objects from SQL Express and change [dbo] to my [administrator] schema from my server.
Ran the scripts against the server. No issues, all objects were created an populated just fine.
I have modified Webconfig and added my BlogContext connection string to point to the server not local sql express.
Published the site.
The error i am getting is : Invalid object name 'dbo.Articles'. - where Articles is one of my entities. It resides on my sql server, [Administrator].Articles.
As far as i can tell EF still thinks im using the DBO schema. Although i have added the connection string to point to administrator user.
How can i change the schema that EF thinks it should use?
EF will use dbo schema if you didn't configure the schema explicitly through data annotations or fluent API.
[Table("MyTable", "MySchema")]
public class MyEntity
{
}
Or
modelBuidler.Entity<MyEntity>().ToTable("MyTable", "MySchema");
Just for searchers: I am just working with EF5 .NET4.5, and
[Table("MyTable", "MySchema")]
does not work. Even if VS2012 shows there is an overload which takes 2 parameters, on build it gives the error: 'System.ComponentModel.DataAnnotations.Schema.TableAttribute' does not contain a constructor that takes 2 arguments.
But the code mapping works just fine.