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Articles by Nitya Raut
Page 9 of 16
How can we take a backup of all the databases by using mysqldump client program?
By using mysql dump client program we can take the backup of all the databases into a file having the extension ‘.sql’. It can be understood with the help of the following example −ExampleIn this example, with the help of mysql dump client program, we are taking the backup all the databases in a file named ‘alldatabases.sql’. The following command will do this −C:\mysql\bin>mysqldump -u root --all-databases > alldatabases.sqlThe above command will create a file named alldatabases.sql which has the dump information of all the databases.
Read MoreHow can we search a record from MySQL table having a date as a value in it?
It can be understood with the help of following example in which we are using the following data from the table named ‘detail_bday’ −mysql> Select * from detail_bday; +----+---------+------------+ | Sr | Name | Birth_Date | +----+---------+------------+ | 1 | Saurabh | 1990-05-12 | | 2 | Raman | 1993-06-11 | | 3 | Gaurav | 1984-01-17 | | 4 | Rahul | 1993-06-11 | +----+---------+------------+ 4 rows in set (0.00 sec)Now, in the following two ways we can search records using the date −mysql> Select * from detail_bday Where Birth_Date = '1993-06-11'; +----+-------+------------+ | Sr | ...
Read MoreWhat would be output if we will try to extract time values by providing the date values only to MySQL EXTRACT() function?
When we try to extract hour value from a date, then EXTRACT() function will give the output 0 with a warning as shown in the below-given example −mysql> Select EXTRACT(Hour from '2017-10-20'); +---------------------------------+ | EXTRACT(Hour from '2017-10-20') | +---------------------------------+ | 0 | +---------------------------------+ 1 row in set, 1 warning (0.00 sec) mysql> Show Warnings; +---------+------+----------------------------------------------+ | Level | Code | Message | +---------+------+----------------------------------------------+ ...
Read MoreIn MYSQL, how can we store a date where the day, month or both month & day are zero?nday are zero?
To store such kind of dates where the day, month or both month & day are zero we must have to set mode of sql to allow_invalid_dates mode.mysql> set sql_mode = 'allow_invalid_dates'; Query OK, 0 rows affected (0.00 sec) mysql> insert into check_date(OrderDate) values('2017-00-00'); Query OK, 1 row affected (0.06 sec) mysql> select * from check_date; +-------------+ | OrderDate | +-------------+ | 2017-00-00 | +-------------+ 1 row in set (0.00 sec)Above query will insert the date in which both month & day values are zero.mysql> insert into check_date(Orderdate) values ('2017-00-05'); Query OK, 1 row affected (0.07 sec) ...
Read MoreHow to use Singleton with Global Context in android?
Before getting into example, we should know what singleton design patter is. A singleton is a design pattern that restricts the instantiation of a class to only one instance. Notable uses include controlling concurrency, and creating a central point of access for an application to access its data store.This example demonstrates How to use Singleton with Global Context in androidStep 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."1.0" encoding>"utf-8"?> "http://schemas.android.com/apk/res/android" xmlns:tools>"http://schemas.android.com/tools" android:layout_width>"match_parent" ...
Read MoreHow to get the number of records in a table using JDBC?
The ResultSet class doesn’t provide any direct method to get the number of records in a table.The beforeFirst() method navigates the pointer/curser of the ResultSet object to its default position before first.In the same way the last() method positions the cursor at the last row of the ResultSet object.Using these methods you can find the number of records in the current ResultSet object.ExampleAssume we have a table named customers table with contents as shown below:+----+---------+-----+---------+----------------+ | ID | NAME | AGE | SALARY | ADDRESS | +----+---------+-----+---------+----------------+ | 1 | Amit | 25 | 3000.00 ...
Read MoreHow to get the size of a column of a table using JDBC?
You can get the size of a column of a table using the getPrecision() method of the ResultSetMetaData class.//Retrieving the ResultSetMetaData object ResultSetMetaData rsmd = rs.getMetaData(); //getting the column type int size_name = rsmd. getPrecision(3);Assume we have a table named employee_data in the database with description as shown below:+----------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+-------+ | id | int(11) | YES | | NULL | | | Name | varchar(255) | YES | ...
Read MoreHow to find tables modified in the last hour in Android sqlite?
Before getting into example, we should know what sqlite data base in android is. SQLite is an open source SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation. SQLite supports all the relational database features. In order to access this database, you don't need to establish any kind of connections for it like JDBC, ODBC etc.This example demonstrate about How to find tables modified in the last hour in Android sqlite.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill ...
Read MoreHow to delete a row from ResultSet object using JDBC?
The deleteRow() method of the ResultSet interface deletes the current row from the current ResultSet object.//Deleting a column from the ResultSet object rs.deleteRow();Assume we have a table named Cricketers_Data with 6 records as shown below:+----+------------+------------+---------------+----------------+-------------+ | ID | First_Name | Last_Name | Year_Of_Birth | Place_Of_Birth | Country | +----+------------+------------+---------------+----------------+-------------+ | 1 | Shikhar | Dhawan | 1981-12-05 | Delhi | India | | 2 | Jonathan | Trott | 1981-04-22 | CapeTown | SouthAfrica | | 3 ...
Read MoreHow to get yesterday records from timestamp in Android sqlite?
Before getting into example, we should know what sqlite data base in android is. SQLite is an open source SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation. SQLite supports all the relational database features. In order to access this database, you don't need to establish any kind of connections for it like JDBC, ODBC etc.This example demonstrate about How to get yesterday records from timestamp in Android sqlite.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required ...
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