working with database using mysql


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create database, create table, insert data, fetch data, read data, update data, delete data

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working with database using mysql

  1. 1. Let’s work with Database (MySql) Author:- Subhasis CMC
  2. 2. MySql & RDBMS • MySQL is a Relational Database Management System (RDBMS). • server can manage many databases at the same time. • In fact many people might have different databases managed by a single MySQL server. • Each database consists of a structure to hold the data and the data itself. • A database can exist without data.
  3. 3. Cont’d ….. • Data in a database is stored in one or more tables.
  4. 4. Cont’d …. • First you create the empty database. • Then you add empty tables to the database. • Table is organized with in rows and columns. • Each row represents an entity in the database • Each column contains an item of information about the entity. • The place where a particular row and column intersect, the individual cell of the table, is called a field.
  5. 5. Cont’d ….. • Tables in databases can be related. • Often a row in one table is related to several rows in another table. • You include a column in one table to hold data that matches data in the column of another table.
  6. 6. Related tables
  7. 7. Communicating with DataBase • All our interaction with the database is accomplished by passing messages to the MySQL server. • It must be able to understand the instructions that you send it. • So we communicate using Structured Query Language (SQL), which is a standard computer language understood by most database management systems
  8. 8. Cont’d ….. • To make a request that MySQL can understand, you build an SQL query and send it to the MySQL server.
  9. 9. Building SQL queries • The first word of each query is its name name, which is an action word (a verb) that tells MySQL what we want to do. • Queries we discuss here: ▫ CREATE ▫ DROP ▫ ALTER ▫ SHOW ▫ INSERT ▫ LOAD ▫ SELECT ▫ UPDATE ▫ DELETE
  10. 10. Cont’d …. • The query name is followed by words and phrases — some required and some optional — that tell MySQL how to perform the action. • For insntace we have to tell the table name to which we want to insert the data.
  11. 11. Don’t forget • SQL language words in all caps. • SQL words must be separated by one or more spaces. • Put the string within double quote.
  12. 12. Sending SQL query • We can send sql query to do what we desire to do using: ▫ The mysql client - A text-based mysql client is automatically installed when we install MYSQL. ▫ Administration software - Separate software packages that are available can provide a more user- friendly interface for interacting with MySQL than the mysql client does. ▫ PHP built in function –we communicate with a MySQL database from PHP scripts by using PHP built- in functions designed specifically for this purpose.
  13. 13. Using the mysql client • To send SQL queries to MySQL from the mysql client, follow these steps: A. Locate the mysql client(it is in bin of your mysql directory) we can start it fom Command prompt of Windows B. To start command is (mysql -u root -p) C. If you are in network then you need command (mysql -h -u root -p) D. At the mysql prompt, type your SQL query followed by a semicolon (;) and then press Enter. E. To leave the mysql client, type quit at the prompt and then press Enter.
  14. 14. Using Administration software • To work with mySql using admin software We need these steps as follow: A. Open your browser and access the phpMyAdmin main page.(localhost:Portnumber/phpmyadmin) B. Click the down arrow in the databases field in the left pane of the phpMyAdmin page. Click the name of the database you want to open. C. Click the SQL link near the top center of the page. D. Type your SQL query in the text area E. Click Go below the query text area.
  15. 15. Protect Ur DB before hacked • MySQL accounts: No one can access the data in your database without an account. Sp protect ur database with a strong password. • Permissions: MySQL uses account permissions to specify who can do what. Differentiate the tasks using different user name and password for different tasks.
  16. 16. Designing Database
  17. 17. Field • The individual cell in which a particular row and column intersect is called a field.
  18. 18. Better to be organized • The table name should clearly identify the objects that it contains with a descriptive word or term. • Column name must speaks about hat will be filled in it. • Name of column and table is case sensitive. • Identify the primary key
  19. 19. Cont’d ….
  20. 20. Creating table • To cretae table we need CREATE TABLE command as follows. CREATE TABLE table_name ( column_name NOT NULL PRIMARY KEY, column_name VARCHAR(37) NOT NULL, column_name VARCHAR(2) NULL );
  21. 21. SELECT command • To fetch / read data we need SELECT command. • We will search the record and show them using SELECT command. SELECT * from employee; • To search something specific we need WHERE clause. SELECT * from employee WHERE designation=‘manager’;
  22. 22. Where to put single quote
  23. 23. ORDER BY • ORDER BY clause is to ensure that the result set produced by the query is returned in the specified sequence. Simply, ORDER BY sorts the results. • Following the ORDER BY keywords is at least one column with an optional ASC (ascending) or DESC (descending) keyword; if neither is specified, ascending is the default. ORDER BY column [ASC | DESC] [, column [ASC | DESC]] ⋮
  24. 24. INSERT command • The INSERT statement inserts one or more rows. INSERT INTO table name (colm1, colm2, colm3..) VALUES (valu1,value2,value3,vlaue4);
  25. 25. UPDATE command • The UPDATE DML statement is similar to the ALTER DDL statement in that it produces a change. • The difference is that, whereas ALTER changes the structure of a table, UPDATE changes the data contained within a table, while the table’s structure remains the same. UPDATE table_name SET column_name = ‘value’; UPDATE table_name SET column_name = ‘value’ WHERE column_name=‘value’;
  26. 26. DELETE command • The DELETE DML statement is similar to the DROP DDL statement, in that it removes objects from the database. The difference is that DROP removes a table from the database, while DELETE removes entire rows of data from a table, but the table continues to exist. DELETE FROM table_name WHERE column_name = ‘value’;