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Articles by Chandu yadav
Page 73 of 81
How to build a Horizontal ListView with RecyclerView in Android?
Before getting into example, we should know what is Recycler view in android. Recycler view is more advanced version of list view and it works based on View holder design pattern. Using recycler view we can show grids and list of items.This example demonstrate about how to build a horizontal list view with Recycler View by creating a beautiful student records app that displays student name with age.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Open build.gradle and add Recycler ...
Read MoreHow to implement Android Pull-to-Refresh?
Before getting into example, we should know what is Pull to refresh layout in android . we can call pull to refresh in android as swipe-to-refresh. when you swipe screen from top to bottom it will do some action based on setOnRefreshListener.This example demonstrate about how to implement android pull to refresh.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code we have given swipeRefreshLayout as parent ...
Read MoreHow to implement Android TextInputLayout
Before getting into example, we should know what is TextInputLayout in android. TextInputLayout is extended by Linear Layout. It going to act as a wrapper for edit text and shows flatting hint animation for edit text.This example demonstrate about how to implement Android TextInputLayout.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code ...
Read MoreCount number of rows in each table in MySQL?
To get the count of rows, you need to use information_schema.tables. The syntax is as follows.SELECT table_name, table_rows FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = ‘yourDatabaseName’;Let us implement the above syntax for a database with the name ‘test’. The query is as follows displaying the table names with the count of rows in the table.mysql> SELECT table_name, table_rows -> FROM INFORMATION_SCHEMA.TABLES -> WHERE TABLE_SCHEMA = 'test';The following is the output.+------------------------------------+------------+ | TABLE_NAME | TABLE_ROWS | +------------------------------------+------------+ | _student_trackerdemo | 0 | | _studenttrackerdemo | 0 | | add30minutesdemo | 0 | | addcolumn | 0 | ...
Read MoreMySQL Select to get users who have logged in today?
To get the users logged in today, use the below syntax. Here, we are expecting that your datetime field is a string type −select yourColumnName1, yourColumnName2, yourColumnName3, ...N from youTableName WHERE STR_TO_DATE(yourColumnName1, ‘format’') =CURDATE();Let’s say we have the following “DateEqualToday “ table that stores users first and last name with the login date −+------+------------+-----------+------------+ | Id | First_Name | Last_Name | LoginDate | +------+------------+-----------+------------+ | 1 | James | Smith | 20-12-2018 | | 2 | Carol | Taylor | 21-12-2017 | | 3 | John ...
Read MoreUsing single quotes around database and table name isn’t working in MySQL?
You need to use backticks around table name as well as database name. The syntax is as follows:UPDATE `yourDatabaseName`.`yourTableName` SET yourColumnName1=yourColumnName1+1 WHERE yourColumnName2=’yourValue’;To understand the above syntax, let us create a table. The query to create a table is as follows:mysql> use test; Database changed mysql> create table Add1Demo -> ( -> Id varchar(10), -> Value int -> ); Query OK, 0 rows affected (1.19 sec)Insert some records in the table using insert command. The query is as follows:mysql> insert into Add1Demo values('1', 780); Query OK, 1 row affected (0.17 sec) mysql> insert into Add1Demo values('2', ...
Read MoreHow to Reset MySQL AutoIncrement using a MAX value from another table?
You can use prepare statement to Reset MySQL AutoIncrement using a MAX value from another table.The following is the syntax −set @anyVariableName1=(select MAX(yourColumnName) from yourTableName1); SET @anyVariableName2 = CONCAT('ALTER TABLE yourTableName2 AUTO_INCREMENT=', @anyVariableName1); PREPARE yourStatementName FROM @anyVariableName2; execute yourStatementName;The above syntax will reset MySQL auto_increment using a maximum value from another table. To understand the above syntax, let us create two tables. The first table will contain the records and the second table will use the maximum value from the first table and use for an auto_increment property.The query to create a table is as follows −mysql> create table FirstTableMaxValue ...
Read MoreCan MySQL automatically store timestamp in a row?
Yes, you can achieve this in the following two ways.First Approach At the time of creation of a table.Second Approach At the time of writing query.The syntax is as follows.CREATE TABLE yourTableName ( yourDateTimeColumnName datetime default current_timestamp );You can use alter command.The syntax is as follows.ALTER TABLE yourTableName ADD yourColumnName datetime DEFAULT CURRENT_TIMESTAMP;Implement both the syntaxes now.The first approach is as follows.mysql> create table CurrentTimeStampDemo -> ( -> CreationDate datetime default current_timestamp -> ); Query OK, 0 rows affected (0.61 sec)If you do not pass any parameter for the column ‘CreationDate’, MySQL by default stores the current timestamp.Insert record in ...
Read MoreHow to delete last record (on condition) from a table in MySQL?
To delete last record (on condition) from a table, you need to use ORDER BY DESC with LIMIT 1. The syntax is as follows:DELETE FROM yourTableName WHERE yourColumnName1=yourValue ORDER BY yourColumnName2 DESC LIMIT 1;The above syntax will delete last record (on condition) from a table. It sorts the column in descending order and choose the first element to delete.To understand the above syntax, let us create a table. The query to create a table is as follows:mysql> create table UserLoginTable -> ( -> Id int NOT NULL AUTO_INCREMENT, -> UserId int, -> UserLoginDateTime datetime, -> PRIMARY ...
Read MoreMySQL increment a database field by 1?
You can increment a database using update command. The syntax is as follows −UPDATE yourTableName set yourColumnName=yourColumnName+1 where condition;To understand the above syntax, let us first create a table. The query to create a table is as follows −mysql> create table IncrementBy1 -> ( -> Id int, -> Name varchar(100), -> CounterLogin int -> ); Query OK, 0 rows affected (0.63 sec)Insert some records using insert command. The query to insert records in the table is as follows −mysql> insert into IncrementBy1 values(100, 'John', 30); Query OK, 1 row affected (0.17 sec) mysql> insert ...
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