I am using Ormlite with SQLite in my android app. The app has multiple threads accessing the databse. How to enable SQLITE_CONFIG_SERIALIZED in ormlite?
You may be able to use the raw methods in the Daos to send commands to the underlying Sqlite database:
http://ormlite.com/docs/raw-update
Maybe something like:
fooDao.executeRaw("SQLITE_CONFIG_SERIALIZED;");
But it seems for this to work the Android Sqlite needs to be built a certain way:
http://sqlite.org/c3ref/c_config_getmalloc.html
Related
import { SQLite } from 'expo-sqlite';
export const db = SQLite.openDatabase("db.db");
I tried to use sqlite in the expo and run from a browser, However, I get error TypeError: Illegal invocation, any can help me please
WebSQL API is so bad it was ultimately abandoned as a standard for the web.
The expo-sqlite module provides an SQL database with a WebSQL based interface. This is pretty powerful, and supports pretty much all the features of SQLite. SQLite is also perfect for exactly the kind of use case that apps with offline requirements have. It lets you store large amounts of structured data on disk and read only the parts you need for displaying the current screen into memory.
Maybe you should try #databases/expo
https://itnext.io/using-sqlite-in-expo-for-offline-react-native-apps-a408d30458c3
import connect, {sql} from '#databases/expo';
const db = connect('my-database');
I'm quite new in c# and Xamarin android and I want to backup and restore my offline SQLite database created with sqliteOpenHelper Class, send and use that on another device. thanks in advance.
In Android API sets, the providers for SQLite library are available under, android.database.sqlite package. The most prominent types in the package are:
1. SQLiteOpenHelper: This is the main class that you need to inherit your classes from, in order to handle the database creation, opening or closing events. Even the events such as create new tables, or deleting the old tables and upgrading your databases to a latest version (such as upgrading the schema), are all handled here in this class-derived classes of yours.
2. SQLiteDatabase: This is the object that you get and use to either push the data to the database, or to read the data from the database.
3. SQLiteCursor: This is the cursor implementation for working with the data records that are returned after Query commands.
The way they all communicate is that, the main class for the data manipulation first of all inherits from SQLiteOpenHelperto get the functions to handle, then later has a field of type SQLiteDatabasein it to execute the functions for writing or reading the data.
For more information, you can check:
https://basicsofwebdevelopment.wordpress.com/2017/02/19/learning-sqlite-databases-in-xamarin-for-android/
https://www.c-sharpcorner.com/article/xamarin-android-develop-sqlite-database-using-sqliteopenhelper/
I am using REST API (https://learn.microsoft.com/en-us/azure/kusto/api/rest/request) to interact with the database in ADX.
I want to create more databases in the same cluster. How should I do it using Java?
I am not using the Java SDK. I have relied on the REST APIs so far.
I think I cannot create a new database using the REST API, so looking for alternative.
It would have been really helpful if there was a command like ".create table tablename" just for the database.
Clusters and databases can be managed using the "Control Plane", aka ARM APIs. These APIs have libraries in different languanges (as well as REST).
For instance, for the java library use this link, for C# use this link
Example for how to create a database in C# library (Java should be very similar):
var database = managementClient.Databases.CreateOrUpdate(resourceGroup, clusterName, databaseName, new Database(location, softDeletePeriod: softDeletePeriod, hotCachePeriod: hotCachePeriod));
Read more here
I think you'll need to use the Azure ARM REST API since the database is treated as a resource. From that point you can interact with it through the ADX APIs.
I have a sqlite database in my UWP app. On the very first launch of my app, I create the database and set it up with all the tables and stuff. I play around with the app and generate some data just fine. But when I close and relaunch the app, it starts giving me 'file is encrypted or is not a database' error while trying to execute any query.
I am using sqlite3.dll v3.12.0 and here is my pragma key statement (with an example encryption key):
"PRAGMA key='aes256:66zk4rsKBIfSJ4vhF1XkzFxzrznOhjjnotuHRdKADIg='"
I verified, on second launch, the encryption key is being used to run the pragma key statement.
Edit: It looks like the encryption went just fine. Because, when I use a tool like SQLite Manager and provide the same key, it opens the db just fine.
I think what might be happening to you Is that you use to have a previous library of SQLite working with encryption working properly like I did.
<SDKReference Include="SQLite.UAP.2015, Version=3.10.2">
<Name>SQLite for Universal App Platform</Name>
</SDKReference>
And since you updated the library to v3.12.0 the PRAGMA key in this version did not work hence not being able to enter to the previous encrypted DB.
I'm trying to rebuild the link to that version but is hard: "SQLite.UAP.2015, Version=3.10.2"
Try to be more clear, I'm in lack of ideas in this problem, even it sounds like a classic.
My application is running on weblogic 10.3.3 application server, and for database I am using Oracle database 11g. My problem is that there is table in db, let's say "user.", there is column, let's say "columnA", in this table. This table is updating by some module of application.
What I want if when value of column is "abc.", then I have to show alert to console(IP). {IP can be retrieved from DB as it is configured in DB. this ip will be other linux system other than linux machine where oracle database is installed.} Updating is continuously done on my table from module of application. Please tell me from where should I start?, what should I read. I am not able to understand what should be approach. Any help is much appreciated.
Can u provide me any begginner.s link of oracle db listener?
You probably want to look at setting up a Trigger in the database
http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28370/triggers.htm
An alternative to a trigger would be to log update queries against the table (to a log file) and have a process monitor the log, sending out alerts when something happens.