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Articles by karthikeya Boyini
Page 93 of 142
How to use lastIndexOf() in android CopyOnWriteArrayList?
Before getting into the example, we should know what CopyOnWriteArrayList is. It is a thread-safe variant of ArrayList and operations add, set, and so on by making a fresh copy of the underlying array.This example demonstrate about How to use lastIndexOf() in android CopyOnWriteArrayListStep 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 taken a text view to show CopyOnWriteArrayList elements.Step 3 − Add the following code ...
Read MoreHow to use isEmpty() in android CopyOnWriteArraySet?
Before getting into the example, we should know what CopyOnWriteArraySet is. It is a thread-safe variant of ArrayList and operations add, set, and so on by making a fresh copy of the underlying array.This example demonstrate about How to use isEmpty() in android CopyOnWriteArraySetStep 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 taken a text view to show CopyOnWriteArraySetelements.Step 3 − Add the following code to ...
Read MoreHow to use in android CopyOnWriteArraySet?
Before getting into an example, we should know what CopyOnWriteArraySet is. It is a thread-safe variant of ArrayList and operations add, set, and so on by making a fresh copy of the underlying array.This example demonstrates about How to use in android CopyOnWriteArraySetStep 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 taken a text view to show CopyOnWriteArraySet elements.Step 3 − Add the following code to ...
Read MoreGiven a column name how can I find which tables in a MySQL database contain that column?
Use the COLUMN_NAME to find which table in a database contains a specific column. Let us first create a table −mysql> create table DemoTable -> ( -> CustomerId int, -> CustomerName varchar(20), -> CustomerCountryName varchar(100) -> ); Query OK, 0 rows affected (1.05 sec)Following is the query to find in which tables a specific column “'CustomerCountryName'” is present −mysql> select *from information_schema.columns WHERE COLUMN_NAME = 'CustomerCountryName';OutputThis will produce the following output −+---------------+--------------+--------------+---------------------+------------------+----------------+-------------+-----------+--------------------------+------------------------+-------------------+---------------+--------------------+--------------------+-----------------+--------------+------------+-------+---------------------------------+----------------+-----------------------+-------+ | TABLE_CATALOG | TABLE_SCHEMA | TABLE_NAME | COLUMN_NAME |ORDINAL_POSITION | COLUMN_DEFAULT | IS_NULLABLE | DATA_TYPE |CHARACTER_MAXIMUM_LENGTH | CHARACTER_OCTET_LENGTH |NUMERIC_PRECISION ...
Read MoreHow to order MySQL rows by multiple columns?
Let us first create a table −mysql> create table DemoTable -> ( -> FirstName varchar(20), -> LastName varchar(20) -> ); Query OK, 0 rows affected (1.44 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John', 'Smith'); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable values('Chris', 'Brown'); Query OK, 1 row affected (0.37 sec) mysql> insert into DemoTable values('Carol', 'Taylor'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('David', 'Miller'); Query OK, 1 row affected (0.24 sec)Display all records from the table using ...
Read MoreHow to use containsAll() in android CopyOnWriteArraySet?
Before getting into an example, we should know what CopyOnWriteArraySet is. It is a thread-safe variant of ArrayList and operations add, set, and so on by making a fresh copy of the underlying array.This example demonstrates about How to use containsAll() in android CopyOnWriteArraySetStep 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 taken a text view to show CopyOnWriteArraySet elements.Step 3 − Add the following code ...
Read MoreSort a column ignoring a specific word in MySQL
Let us first create a table −mysql> create table DemoTable -> ( -> Name text -> ); Query OK, 0 rows affected (1.31 sec)Insert some records in the table using insert command. Here, we have inserted a name with a specific word “name”, which we need to ignore −mysql> insert into DemoTable values('John 7'); Query OK, 1 row affected (0.65 sec) mysql> insert into DemoTable values('John 6'); Query OK, 1 row affected (0.42 sec) mysql> insert into DemoTable values('John 9'); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable values('name John 3'); ...
Read MoreChange the column name from StudentName to FirstName in MySQL?
Use CHANGE with ALTER statement. Let us first create a table −mysql> create table DemoTable -> ( -> StudentName varchar(100), -> Age int -> ); Query OK, 0 rows affected (0.84 sec)Now check the description of table −mysql> desc DemoTable;OutputThis will produce the following output −+----------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------------+--------------+------+-----+---------+-------+ | StudentName | varchar(100) | YES | | NULL | | | Age ...
Read MoreFix Drop table view #1051 unknown table error in MySQL
To correctly drop a view, use the below syntax −drop view yourViewName;Let us first create a table −mysql> create table DemoTable -> ( -> Id int -> ); Query OK, 0 rows affected (1.01 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1001); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(1002); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable values(1003); Query OK, 1 row affected (0.26 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------+ | ...
Read MoreMySQL query to conduct a basic search for a specific last name in a column
You can use LIKE operator to conduct a basic search for last name. Let us first create a table: −mysql> create table DemoTable -> ( -> CustomerName varchar(100), -> CustomerAge int -> ); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John Doe', 34); Query OK, 1 row affected (1.32 sec) mysql> insert into DemoTable values('David Miller', 24); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Bob Doe', 27); Query OK, 1 row affected (0.18 sec) mysql> insert into ...
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