Trending November 2023 # A Sql Primer For Android App Developers # Suggested December 2023 # Top 19 Popular

You are reading the article A Sql Primer For Android App Developers updated in November 2023 on the website We hope that the information we have shared is helpful to you. If you find the content interesting and meaningful, please share it with your friends and continue to follow and support us for the latest updates. Suggested December 2023 A Sql Primer For Android App Developers

So, you have your program and you have your database with client details, usernames and passwords, or players and high scores. There are a number of different actions you might wish to perform to get to this point and to make use of the database going forward.

These actions are performed via statements. So, for example, in order to create a new table, we do so by using CREATE TABLE. To add more data, we use INSERT INTO. To delete data, we use DELETE.

There are a great many different SQL statements that you can use to manage your databases. However, most Android developers will find themselves relying on a few key statements.

The first thing you’ll need to do is to create your database. Some databases will let you do this with CREATE DATABASE, but in SQLite3, you use $sqlite, followed by the database name. You’ll probably do this using a Java class, depending on how you want to go about it. But once you’ve done that, you’re good to get started with a whole range of different statements.


A database needs tables. The next step then will be to use CREATE TABLE in order to build one. This is again pretty straightforward, as long as you can imagine the table being built in columns.


CREATE TABLE Clients (     rowid integer PRIMARY KEY,     LastName text,     FirstName text,     Phone text,     Email text INSERT

Now you’ve got a database with an empty table called ‘clients’. The next thing you’ll probably want to do is to put some data in there! To do this we use INSERT INTO. Here, you’ll insert into your specific table and then you’ll list the columns in brackets, followed by the values.


INSERT INTO table_name (column1, column2, columm3) VALUES (value1, value 2, value3);

You’ll be able to insert information into some columns and not others.  We can also insert multiple rows of data using just a single statement, by using lots of brackets separated by commas.

For example, if we wanted to update our clients table, then we would do something like this:


INSERT INTO Clients (LastName, FirstName, Phone, Email) VALUES DELETE

DELETE is for deleting rows from tables. To use delete, the correct syntax is:


DELETE FROM table_name WHERE condition;

So, if we wanted to delete a single record, we could use:


DELETE FROM Clients WHERE FirstName=‘Roy’;

Roy Wood wasn’t in the band for very long, so he doesn’t get to stay on the list. We could also use this to delete anyone over a certain age.

If you just use DELETE FROM table_name; then you’ll end up deleting the entire contents of the table. Be very sure before you do that! If you want to delete the contents of the table and it’s structure, then you’d use DROP TABLE. Be even more careful when doing that.


Adding and removing data is straightforward enough. Occasionally, you’ll just want to update some information. Maybe you just need to change the email address but you don’t want to delete and reinsert the entire record.

In that case, you can use UPDATE in the following manner:


UPDATE Clients



Using these statements will build your database up nice and big. But that’s pretty useless until you can also retrieve that information back.

SELECT is used to return a set of results from one or more tables. If we wanted to retrieve someone’s name or a list of clients aged 21, then we would use SELECT and follow this up with some specific details to define precisely the kind of data we want to retrieve.


SELECT column_name FROM table_name;

This would allow us to select a whole bunch of different columns from our specific table.

FROM is a clause that changes the behavior of the SELECT statement. In this case, it defines which table we want use. FROM is a required clause in any SELECT statement. However others like WHERE are optional. WHERE allows us to filter the rows that have been retrieved by a ‘predicate’ – a true or false statement. Imagine my client contact details table had another column in it for ‘age’ and we wanted to find clients older than 21. In that case we would type:


SELECT FirstName FROM Clients

A quick example

To see how this might work in practice, here’s a project from Gary that puts SQLite into use in the context of an Android app:


import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import; import android.os.Bundle; import android.widget.TextView; import java.util.Random; public class MainActivity extends AppCompatActivity {     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);                         SQLiteDatabase db = openOrCreateDatabase("mydb", MODE_PRIVATE, null);         db.execSQL("DROP TABLE IF EXISTS mydata;");         db.execSQL("CREATE TABLE mydata(key text, val integer);");                         Random r = new Random();         int  n = r.nextInt(100);         db.execSQL("INSERT INTO mydata (key, val) VALUES ('random', " + n + ");");                         Cursor results = db.rawQuery("SELECT val from mydata WHERE key='random';", null);         results.moveToFirst();         int myr = results.getInt(0);                 db.close();                 TextView t = (TextView) findViewById(;         t.setText(Integer.toString(myr));     }

More statements, more possibilities

There are many more statements you’ll likely find yourself using frequently. For example, ALTER can allow you to add new columns. AS allows you to rename columns and tables. COUNT lets you count entries. HAVING is similar to WHERE. GROUP BY lets you group your results.

Of course, this is by no means a comprehensive guide. There is a lot to learn here. You can even use extensions in order to perform complex statements like If, Then, and others (though most of this can also be done through Java if you’re using SQLite for building apps).

You're reading A Sql Primer For Android App Developers

A Primer On Multilingual Keyword Research

Examples show why you should avoid the cultural pitfalls of over-simplistic keyword research

When working on keyword research, it’s easy to fall into the trap of thinking that tools will do the job of brains. Let’s clear that out from the outset: they won’t. Tools are only as good as their handlers. Give a spanner to a monkey, it’ll find ingenious ways to use it. Give the same spanner to a dog and it goes from tool to toy. We should use tools wisely!

There are countless tools dedicated to the daunting task of keyword research and there’s a growth in tools for multilingual keyword research. A promising trend, but we should never believe tools can replace the work of a native expert in a given market.

So often is the case a client will already have an English-language keyword list that they use and generate through translators into a target market’s ‘language’. These translations are then put through various tools until the client finally believes there’s a multilingual campaign; but the task is not so straight forward.

Yes it’s about language, but it’s just as much about culture. We believe global keyword research will only truly be global if we identify and expose the various idiosyncrasies related to a given market. Different countries have different audiences, with unique dialects, languages, cultures and belief systems.

Above all, global keyword research should reveal the online search habits of a market – the same cannot be said of directly translated keywords.

Search intent – or customer intent? This directly affects success in any international online campaign. Before you start any keyword research ensure you understand the search intent landscape of your target market and its culture. A well-informed international marketing strategy, built from the ground up, is essential for campaign success.

Take Switzerland, for instance. It has four official languages and apart from the native Romansh language none were ‘born# in Switzerland (German, French and Italian).

In the case of Indonesia, it has approximately 700 languages spoken at any one time.

Variations of a subject, product or item, are also endless and should always be taken into account. For example, while in most of France a sweet roll in chocolate is referred to as ‘pain au chocolat’, west-southerners prefer to call it ‘chocolatine’. This directly affects the flow of regional search traffic as highlighted below:

Another curious case is that of the Arabic language – spoken in some 27 countries worldwide. There are multiple ways to write a particular term in Arabic. Take this example from the work we did for our client, BBC World News:

Both الاخبار and اخبار mean ‘news’ but different Arabic-speaking countries have different behaviour towards their uses. We can clearly see the difference in Egypt with 301,000 average monthly searches for الاخبار (news) and 30,500 for اخبار (news). This is a language analogy – but why don’t we spice this up with a bit of culture?

Some of these countries have a history of being French colonies. Let’s check this out.

Actualités, a French term for ‘news’, has an estimated 260 average monthly searches in Egypt.  This volume becomes increasingly small when compared to ex-colonies of France: Algeria and Morocco both on average have 6,600 searches per month for ‘actualités’, while Tunisia  has 3,600 searches per month.

What’s weird is how the United Arab Emirates seem somewhat lost in this group of countries. That was the case until we looked at this from yet another angle:

English is considered a predominant language in the UAE with 40,500 average monthly searches for ‘news’ – unofficially. But culture has little regard for pigeon-holing – and hence the insights.

When you dive into multilingual and international online campaigns, always analyse the targeted country from a holistic perspective. Take into account both language and cultural nuances (which are also partial to its historical background). The simplicity of a translated keyword list is enticing – we know – but it only skims the surface, if that.

Let’s look at another example; how about the terms ‘tragamonedas online’ and ‘tragaperras online’. Spanish for ‘slot machines’ and the ambiguous ways Spanish-speaking countries interchange these terms.

The graph above confirms that ‘tragaperras online’ is an inherently European Spanish term, with 320 average monthly searches in Spain, compared to 90 for ‘tragamonedas online’.

The other variation ‘tragamonedas online’ comes out as the leading Latin American term, with a much higher search volume throughout the region; 2,900 average monthly searches in Argentina against 170 searches for ‘tragaperras online’.

Translating implies a one-size-fits-all approach. It clouds vision by trying to average out cultural nuances that are detrimental to the success of any campaign.

As Benedict Anderson once said, ‘a language is an imagined community’ and here at Oban we firmly believe only native speakers who are still immersed in their own native cultures can really, truly dig out those exquisite jewels of keyword research and search intent. Keyword research should always strive to show us behaviour; and behaviour is a perpetual stage of change – something a list of translated keywords will never be able to do.

The Dangers For Moonlighting Developers

“You are going to be so busted!”

My coworker Tyler was probably right. But I didn’t care. I had been moonlighting for months writing software on the side, saving up for my latest gadget. I couldn’t wait to play with this new, cool handheld device called a PDA.

(Yes, this was ten years before Phineas and Ferb’s sister Candace made famous the “busted song,” back when everyone desired a Palm Pilot.)

I tried to walk the straight and narrow path. I knew my company had authorized all managers to purchase Pilots on the company’s dime. So when my manager Stan walked past me in the office kitchen with his new Pilot, I saddled up next to him laying on the compliments.

“Those are awesome Stan. You are so lucky!”

Sam smiled and said, “I know. I love this thing. I can actually plug it into my computer and sync with the Internet. How cool is that?”

I didn’t want to miss this opportunity. “I know! I could download articles about the latest software development trends and read them anytime. I think there are opportunities to even explore how to create applications we may be able to use here.”

As Sam grabbed a soda from the fridge, he turned and looked at me questioningly.

“That’s ridiculous. These are only useful for time management, reading content offline and playing games.” Stan laughed and said, “Not that I play any games on it.”

I responded, “Yeah but what if I could create some way to track inventory levels or project tasks? Would the company reimburse me if I bought one for this sort of research?” I stammered not so convincingly because I wasn’t even sure if this was possible.

Sam laughed again and rolled his eyes. “Oh yeah, that will work. These handheld devices will never be useful for running business applications. Sorry my friend, if you want one, you’re on your own.”

So as I followed Sam out of the kitchen back to my cube I formulated a plan to raise some extra cash.

Moonlighting wasn’t something I had considered before. But as luck would have it a friend of mine needed help with setting up his small business with Microsoft Office 97 and building an office automation application.

Granted, I only needed a few hundred dollars for the Pilot, but I had other reasons to raise some extra cash. My car was ready for replacement and my wife and I were thinking about buying a home.

Funny that the main motivation pushing me into moonlighting was the shiny little gadget. Okay, not exactly shiny like the iPad 3’s amazing Retina Display, but even with its dull grayish plastic case it was shiny in my eyes.

I did my best to work at nights and weekends. But because I was also working overtime on a project for my job, my side work was becoming a balancing act requiring later nights and in some cases early mornings in the office.

My co-worker Tyler surprised me one early morning in the office. I was so focused on my laptop screen I didn’t even realize he was standing behind me.

“What are you doing here so early? And what is that you are working on?” Tyler was sharp enough to recognize the code on my screen was not something work related.

I didn’t think it was a big deal to be in the office at 6:30 AM writing code that wasn’t related to work. So I spun around to face Tyler and explained what I was doing.

I was taken aback. “What’s the big deal? I’m still going to get my work project done.”

“You don’t get it do you? You are using a company laptop for side work! You can be fired for that my friend.”

I honestly hadn’t thought about it. Maybe Tyler was right, but I just shrugged, spun back around and started coding again. “Whatever Tyler. I will get this done before Stan gets in. It’s not a big deal. Just please keep it to yourself.”

Tyler said, “I won’t rat you out. But be careful man.”

Over the next few weeks I could feel the stress building. It became obvious my work project deadline and my side project deadline were about to collide. I didn’t think ahead to see how much the deliverable timing was going to impact my ability to get everything done.

Latest Features In Google Photos App For Ios And Android

With every new update, the arrangements in software and tools change to make it better for customer use. Google Photos app seems to be following this policy quite often. The latest update rolled out for Google Photos app intends to make it easier for users to put their recent images in new albums. How? When a person returns from an event or trip, Google Photos will automatically compile and suggest an album of your latest photos so that you have a story crafted out from it.

The arrangements and features in an app are changed over time to make it better for customer use. Building upon this, Google has introduced new features in Google Photos app for people struggling to manage their photos and videos.

New features in Google Photos app for iOS and Android

The very first change you’ll notice in the app when you launch it is the changed icon. The original Google Photos icon designed was inspired by a pinwheel. The same icon has been refreshed and simplified.

Secondly, the new Google Photos app intends to make the app simple for use. So, it brings a search front-and-center with a new three-tab structure. Also, photos and videos have received more prominence. Apart from these, there’s a change in

Three-tab structure

Revamped Search function

New Library feature

Map View

Memories function

Let’s explore the above-mentioned features in a bit detail!

1] Three-tab structure

In comparison to the earlier version which supported 4 tabs (Photos, Albums, For You, Sharing), the new Google Photos app has a three-tab structure – Photos, Search, and Library. The Sharing feature has been changed into a function and the ‘For You’ tab has been removed completely.

The latest update rolled out for Google Photos app intends to make the app simple for use. It also brings a search front-and-center with a new three-tab structure. Photos tab, as always, stores all your photos and videos, but now you’ll see larger thumbnails, auto-playing videos, and less white space between photos. Also, under the tab, you can find both, old favorites and recent shots.

2] Revamped Search function

As photo libraries continue to grow larger in size, the search function has become increasingly important. For this reason, Google has put search front and center to give you quick access to the People, Places, and things that matter to you. To be precise, the tab displays the people and pets who appear almost regularly in your photos and videos.

3] New Library feature

The Library tab represents a collection of the most important destinations in your photo library, like Albums, Favorites, Trash, Archive, and more. It has a print store that allows you to readily turn photos into prints and books. The store currently will be visible only to the U.S., EU, or Canadian customers.

4] Map View

Google says that as a part of the new search tab, the app users will see an interactive map view of their photos and videos. It has been one of the most requested features. The newly added capability will support gestures like pinch and zoom around the globe to explore photos of travels, find the location where you’ve taken maximum photos (A gentle tap on ‘view all’ option under ‘Places’ will present you with a grid of locations). If you do not want it to be enabled, simply disable the ‘Location History’ and ‘camera location permission’

5] Memories

If you have been a long-time Google photos user, you will notice that the ‘For You’ tab has been replaced by ‘Memories’. It’s a collection of some of your best photos and videos whether from recent weeks or previous years. To access it, tap ‘Photos’ and select a memory from the top. All your things like collages, styled photos, and animations will be visible under it.  You can view it as a sort of a private archive of your old photos that you browse like Instagram Stories.

Memories feature is available for iOS and Android devices only. As such, if you are using the web version of the Google Photos app, it will not be available to you.

And you can always access your shared content by tapping on the “conversation” button in the upper left corner.

Google hopes the app users will like the new change and its simplified Google Photos experience.

Please note that if the changes are not visible to you, do not worry! Google will roll out the update over the coming weeks, worldwide.

Related Read: How to add Google Photos to Photos App in Windows 10.

Which Android Credit Card Payment App Is Best For You?

Credit card payment applications have made accepting payments on mobile devices commonplace, especially for businesses at trade shows, conventions, festivals and more. Of course, trusting a third-party company with your customers’ credit card information and a significant chunk of your revenue is a major decision.

How to choose a credit card payment app for Android

Researching the many mobile credit card processors out there can be a monumental task. Not only are there many vendors, each has its own credit card readers, terms, conditions, fees and rates. Sifting through all this information can be a challenge for the busy entrepreneur. Luckily, with the proper criteria in mind, the research phase of your buying journey becomes easier.

Here’s a look at the critical aspects of mobile credit card processing to keep in mind when you’re examining the market.

Pricing model: Pricing for mobile credit card processors generally includes a flat, percentage-based rate as well as a per-transaction fee in some cases. Rates generally cost 2% to 4% of each transaction. Some credit card processors offer an interchange-plus or tiered pricing model instead, which can reduce the rates you pay per transaction, but typically come with monthly and yearly account maintenance fees that make it expensive for merchants that process less than $3,000 per month.

Additional fees: Most mobile credit card processors with flat-rate pricing don’t charge many fees beyond their per-transaction rates, except for the chargeback fee triggered when a customer disputes a charge. However, if you choose a vendor that uses the interchange-plus or tiered pricing model, they will also charge account maintenance fees, such as monthly statement fees, gateway fees and monthly minimum fees. 


Become familiar with the various fees credit card processors often require.

Contract terms and services: Many mobile credit card processors operate on a pay-as-you-go basis, so you only pay for the processing you use. Others use a month-to-month subscription model or require a long-term contract. Understand the terms and conditions, as well as the required contractual obligations, before deciding on a credit card processor.

EMV-compliant card readers: EMV-compliant credit card readers read the chips that most new cards contain. EMV chips generate a unique number during every transaction, making it impossible to fraudulently replicate a transaction. The transition to EMV chips was difficult and costly for many retailers, so using an EMV-compliant mobile credit card reader is a cost-effective way for small businesses to stay current with modern credit card security standards.

NFC-enabled card readers: Near-field communication, or NFC, allows for contactless payment solutions. These types of credit card readers allow customers to quickly tap their cards – or their phones, if they’re using a mobile wallet like Google Pay – to make the payment, rather than swiping the card or waiting for the reader to scan the card’s EMV chip. This allows businesses to keep things moving at the checkout counter.

Third-party integrations: The third-party software integrations available with each credit card processing service are also an important factor. These integrations can improve your business’s workflows by streamlining how sales data enters your other software systems. For example, some credit card processors offer integrations from their point-of-sale software to top accounting software, automatically updating sales numbers so you don’t have to manually enter the same data you already collected at the point of sale.

Reporting: Finally, transparent and detailed reporting is a must when it comes to your finances. A credit card processor should offer useful canned reports. Ideally, you should also be able to customize reports by applying filters to the data collected by the software.

With these factors in mind, you’re ready to test out the Android credit card payment apps on the market. If you’re still not sure where to start, chúng tôi has already reviewed hundreds of credit card processors. Here are some of the best credit card readers for Android that we encountered.

Editor’s note: Looking for the right credit card processor for your business? Fill out the below questionnaire to have our vendor partners contact you about your needs.


Merchants can readily accept payments from mobile wallets, including Google Pay, if they have an NFC-capable credit card reader or point-of-sale system.

How mobile credit card processors are changing portable payments

In the past, businesses that traveled were limited to accepting credit card payments over the phone or accepting cash or checks, which carried certain risks and logistical challenges. Today, mobile credit card processors have solved that problem. Whether your business is mobile as a matter of operations or you’re visiting a trade show or convention, a mobile credit card processor allows you to conduct business anywhere. Keep in mind the criteria above and compare the details of each service to one another to make the best decisions about your business’s mobile payment collections.

Jennifer Dublino contributed to the writing and research in this article.

8 Important Security Tips For Web Developers

Software is increasingly becoming an integral part of modern businesses. The increasing demand for software means that developers have to work incredibly hard to keep up. Businesses are requiring faster application delivery while web development grows more complicated. For instance, with tight deadlines,

web developers

have to build applications that can adapt to any device, integrate with other services, and port to any platform. On top of that, they must create applications that can withstand increasingly complex attacks. 

The problem is that with the growing demand and changing requirements, web developers often find it hard to keep up. Some development aspects tend to be overlooked, and security is a major culprit. While security is increasingly becoming an important part of development, most web developers are not following some basic

security principles

. Consequently, there are numerous applications with serious security vulnerabilities. This article seeks to outline important security guidelines every web developer should follow.

1. Implement security testing

With hackers inventing new techniques everyday, security testing is necessary to enhance the security of your web application. The objective of web application security testing is to find out how vulnerable an application may be and establish whether its resources and data are protected from potential attacks.

Learn more about testing


2. Know what you should protect

An important security principle every web developer should follow is only storing the data they need. To establish which data you should store, ask yourself how much it would hurt the company or the client if the data was compromised. There is really no need to store sensitive customer data such as their credit card numbers and addresses. 

3. Encrypt sensitive user data

If you must store any sensitive information in your database, ensure it is encrypted. Storing unencrypted data in your database can easily land you and your company in hot water. You don’t want to lose customers’ sensitive data because you kept it in plain text in your database. Encrypting sensitive data is even more crucial in shared hosting environments or large companies, since not everyone with access to the data can be trusted to not exploit it. 

4. Make use of a VPN

Additionally, depending on the website you are working on, you may have access to crucial client data, which can be devastating if it’s compromised. Schematics, financial information, patent information, and a lot more can get into the wrong hands if you’re not careful with your security.

Masking your IP

using a VPN eliminates the risk that this data faces.

5. Keep your software updated

When trying to gain access to your database, a cybercriminal will always try to exploit the path with the least resistance. In most cases, the path of least resistance is found in insecure and

outdated software

. To minimize the risk of being hacked, be sure to thoroughly patch and update your application. 

Another important thing you must do is to disable unused software. It is common to find companies with software linked to their systems that are not in use. If left unchecked, unused software provides an easy pathway for hackers. 

6. Apply the principle of least privileges

Sometimes, external attackers are not the biggest

threat to your data

. It may be an ill-informed end-user with several system privileges. By reducing user privileges, you minimize the risk of security mistakes from uneducated end-users. 

In every IT system or web application, it’s prudent to give users only the privileges they really need as opposed to giving all users the same access level. The principle of least privileges keeps your system more secure by eliminating the risk of abuse by unqualified users. It also eliminates unprivileged users from the blame in case of a breach. 

7. Use server-side and client-side validation

For enhanced security, be sure to perform both server-side and client-side validation. Server-side validation helps to prevent malicious input, such as someone planting their code into your database. Client-side validation helps to prevent user mistakes such as forgetting a field or entering data incorrectly. 

8. Sanitize user input

There should never be direct communication between user input and the database. It should be sanitized and validated to enhance data integrity and prevent common attacks such as SQL injection. 


Update the detailed information about A Sql Primer For Android App Developers on the website. We hope the article's content will meet your needs, and we will regularly update the information to provide you with the fastest and most accurate information. Have a great day!