MySQLi Articles - Page 11 of 341

The standards compliance tells how MySQL is related to the ANSI/ISO SQL standards. There are many versions of the SQL standard, and the phrase ‘SQL standard’ is used to refer to the current version of SQL standard at any point in time.Following are the MySQL Standards Compliance −MySQL server was originally designed to work with medium-sized databases (10 to 100 million rows or 100 MB per table) on small systems. But currently, it has been upgraded to work with terabyte-sized databases.MySQL supports ODBC levels ranging from 0 to 3.5.1.MySQL also supports high-availability database clustering, which can be achieved with the ... Read More

What is a bug?A bug is something that results in the program stalling or halting abruptly. This results in anomalies and causes complications, resulting in the task not getting complete. MySQL helps resolve these bugs, once they are reported.Some bugs have fixes since they would have been previously reported, and fixes would have been provided.Pre-requisitesBefore posting a bug report, it is important to verify that the bug hasn’t been reported already. For this purpose, look for the problem in the MySQL manual at https://dev.mysql.com/doc/. The manual is always updated with solutions to newly found issues.If there is a parsing error ... Read More

MySQL Enterprise EditionMySQL Enterprise Edition comes with advanced features, management tools, and technical support that helps users achieve the highest levels of MySQL scalability, security, reliability, and uptime. It reduces the risk, complication, and cost associated with development, deployment, and management of business-critical MySQL applications.MySQL Database Service is a fully managed database service that helps deploy cloud-native applications using the MySQL, which is considered as the world’s most popular open source database. It is completely developed, managed and supported by the MySQL Team.MySQL Standard EditionMySQL standard edition ensures that user delivers high-performance and provides scalability on OLTP applications (Online Transaction ... Read More

Some of the options and variables newly introduced in MySQL 8.0 have been listed below:Com_clone: It refers to the number of CLONE statements. It was added in MySQL 8.0.2.Com_create_role: It refers to the number of CREATE ROLE statements that are used. It was added in MySQL 8.0.0.Com_drop_role: It refers to the number of DROP ROLE statements that were used. It was added in MySQL 8.0.0.Com_restart: It refers to the number of RESTART statements that were used. It was added in MySQL 8.0.4.Firewall_access_denied: It refers to the number of statements that were rejected by MySQL Enterprise Firewall. It was added in ... Read More

Some of the features have become obsolete and have been removed from MySQL 8.0. When alternatives to these removed items are shown, they need to be used to avoid further complications.The ‘innodb_locks_unsafe_for_binlog’ system variable has been removed.The ‘READ COMMITTED’ isolation level can be used since it behaves in a similar way.After upgrading the system to MySQL version 8.0.3 or later, scripts that reference previous InnoDB INFORMATION_SCHEMA view names have to be upgraded.Some of the account management attributes have been removed. A few have been listed below:Instead of using ‘GRANT’ to create users, use ‘CREATE USER’.The query cache has been removed.The deprecated ... Read More

Some of the features that have been deprecated may be removed in the upcoming versions of MySQL. If applications use the features that have been deprecated in that specific version, that feature should be revised and alternatives should be used wherever possible.Let us understand in brief, the features that have been deprecated in MySQL 8.0:The ‘utf8mb3’ character set is deprecated, use ‘utf8mb4’ instead.The ‘sha256_password’ password authentication is deprecated, may be removed in future updates. Use ‘caching_sha2_password’ instead.Some implementation changes have been made to ‘validate_password’ plugin, may be removed in future versions. Use this plugin by ensuring that component infrastructure is ... Read More

MySQL is a very powerful program in its own right. It handles a large subset of the functionality of the most expensive and powerful database packages. It uses a standard form of the well-known SQL data language. MySQL 8.0 released on 19 April 2018 and the current version is 8.0.23.The new features in MySQL 8.0 have been briefly listed below:Atomic DDLAn atomic data definition language (DDL) statement to combine updates made to data dictionary, storage engine operations and so on.Encryption DefaultsThe encryption defaults have been defined and implemented globally for table encryption.  The ‘default_table_encryption’ variable is used to define an ... Read More

To check for such conditions, use IF() in MySQL.Let us create a table −Examplemysql> create table demo89    -> (    -> duedate date    -> ); Query OK, 0 rows affected (0.78Insert some records into the table with the help of insert command −Examplemysql> insert into demo89 values('2020-01-10'); Query OK, 1 row affected (0.55 mysql> insert into demo89 values(null); Query OK, 1 row affected (0.13 mysql> insert into demo89 values('2020-11-29'); Query OK, 1 row affected (0.15 mysql> insert into demo89 values('2019-11-29'); Query OK, 1 row affected (0.09Display records from the table using select statement −Examplemysql> select ... Read More

To create a table, you need to insert below line into application.properties −spring.jpa.hibernate.ddl-auto=updateHere, Hibernate will create the table demo88 automatically. The application.properties code is as follows −spring.datasource.platform=mysql spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect spring.jpa.hibernate.ddl-auto=update server.port=8191 spring.datasource.driverClassName=com.mysql.jdbc.Driver spring.datasource.url=jdbc:mysql://localhost:3306/sampledatabase spring.datasource.username=root spring.datasource.password=123456The demo88 entity class is as follows to create table columns −Examplepackage com.automaticallytablecreation; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.Table; @Entity @Table public class demo88 {    @Id    private int id;    @Column(name="name")    private String name; }The main class code is as follows −Examplepackage com.automaticallytablecreation; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class AutomaticTableApplication {    public static void main(String[] ... Read More

For this, you can use ISNULL in MySQL.Let us create a table −Examplemysql> create table demo86    -> (    -> value1 varchar(20)    -> ,    -> value2 varchar(20)    -> ); Query OK, 0 rows affected (2.77Insert some records into the table with the help of insert command −Examplemysql> insert into demo86 values(null, null); Query OK, 1 row affected (0.34 mysql> insert into demo86 values(null, 'John'); Query OK, 1 row affected (0.16 mysql> insert into demo86 values('David', 'Mike'); Query OK, 1 row affected (0.17 mysql> insert into demo86 values('Sam', null); Query OK, 1 row affected ... Read More