1 / 17

SQL

SQL. pepper. Why SQL. File I/O is a great deal of code Optimal file organization and indexing is critical and a great deal of code and theory implementation File locking Security concerns Much more. Different SQL Servers.

rjo
Download Presentation

SQL

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SQL pepper

  2. Why SQL • File I/O is a great deal of code • Optimal file organization and indexing is critical and a great deal of code and theory implementation • File locking • Security concerns • Much more

  3. Different SQL Servers • Mysql (open source – no cost to use though may cost to embed and resell outside gpl) • Ms sql (microsoft ) • Oracle • Sybase • Access • Older AS/400 – SQL machine

  4. Structure • SQL Server runs a service • accepts sql commands using their version of the standard query language • Allows access to the data inside the SQL server • Organized into databases • Tables (like spreadsheets) inside databases • Gui management interface • Access / mysql workbench / mssql studio mgr

  5. Your databases • Connect with : mysql -u yourdbuser -p yourdatabase • The –p means the password will be entered later. You can also put the password right after the p as in pmypassword. No spaces and no quotes • Your database name is your db user and is usually your ecampus logon name • You should also be able to connect to pepperdb • See your tables show tables • See information inside your table select * from tablename

  6. Create a table • CREATE TABLE table_name (column_namecolumn_type ); • Plus insert PRIMARY KEY ( id ) at end • Ex: • create table tut( id INT NOT NULL AUTO_INCREMENT, title VARCHAR(100) NOT NULL, type VARCHAR(40) NOT NULL, date DATE, PRIMARY KEY ( id ) ); Credit to : http://www.tutorialspoint.com/mysql/mysql-create-tables.htm

  7. Create a related table • Create table types ( type VARCHAR(40) NOT NULL, name VARCHAR(100) NOT NULL, manager int not null, PRIMARY KEY ( type) ); Table picture from wikipedia

  8. Insert a row • INSERT INTO table_name ( field1, field2,...fieldN ) VALUES ( value1, value2,...valueN ); • Examples: • INSERT INTO tut ( title, type, submission_date) VALUES ("Learn PHP", "php",NOW()); • INSERT INTO tut (title, type, submission_date) VALUES ("Learn MySQL", "db",NOW()); • INSERT INTO tut (title, type, submission_date) VALUES ("Learn Oracle", "db",NOW()); Credit: http://www.tutorialspoint.com/mysql/mysql-insert-query.htm

  9. Insert rows into another table • INSERT INTO types values ("php", "php tutorials",10); • INSERT INTO types values ("db", "database tutorials",20);

  10. Query your tables • select * from tut ; • select * from types; • select * from types inner join tut on tut.type = types.type;

  11. Select statement • Select – keyword indicating just looking • List all columns (* for all; table.column) • From – keyword indicating table names follow • Table name • Join type + next table + on + matching fields • Where – keyword indicating row selection • Column = something

  12. Switch to another database • Show databases • Use <database name>

  13. MySQL Workbench • Mysql IDE • Free community version • Install with connector/J so you can connect to java • Your server password is critical • Models vs Database vs Server Instance • Model forward engineer to database • Forward engineer script can be run on panther

  14. Java and Sql • Need a connection driver • Mysql : connecter /j -> jdbc • Java: • Add mysql connector/j jar file to your IDE • Your code: • Import java.sql.* • Load the jdbc driver inside your code • Class.forName("com.mysql.jdbc.Driver").newInstance(); • Create a connection object • Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306","root","root");

  15. Java and SQL cont • Make an sql statement object • Statement st = conn.createStatement(); • Build a statement • String aSQLst = "create database warehouse" • Execute the statement • st.execute(aSQLst);

  16. Java and SQL get results • Select statement will return a result as a result set object • Create the result set object • ResultSetrs = null • Execute your select • rs = st.execute("select * from mytable"); • Loop through results: while (rs.next()){intnum = rs.getInt("numColumn");String word = rs.getString("name");}

  17. Summary • What is SQL • How to open a database • How to create tables • How to query tables – very, very basic • How to switch database context • Using SQL with Java

More Related