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Whiteboard - July 9th 2012 (Unedited)
Notes Day 2 - Intro to PL/SQL @ De Anza College. Question - Where do I find the practice exercises? Review >> Introduction to PL/SQL Environment Benefits of PL/SQL Writing procedures and functions. Declaring Variables x INTEGER := 55; NOT NULL DEFAULT VALUE DATATYPES SCALAR COMPOSITE REFERENCE LOB BIND VARIABLES <-- Declared in PL/SQL Environment. Reviewed video lecture: Difference between Binary_integer and PLS_Integer What is the difference between Long RAW, LONG and VARCHAR2? Different types of Timestamp? <-- Illustrate the usage of timestamp datatypes using an example. usage of %TYPE keyword. How to create a script? Use notepad or your favorite text editor -- create your script and save it. Run it --> Simply copy and paste in your telnet session. Writing Executable Statements: DECLARE --DECLARE VARIABLES BEGIN --CODE IS WRITTEIN IN BETWEEN BEGIN AND EXCEPTION. EXCEPTION --EXCEPTION PART OF CODE IS EXECUTED IF THERE IS AN ISSUE WITH CODE UNDER BEGIN CLAUSE. END; WRITING COMMENTS IN PL/SQL /* MULTI-LINE COMMENT. */ --SINGLE LINE COMMENT WHEN WRITING PROGRAM BLOCKS - BEGIN x := y || CHR(10) || z; SQL functions -- number, character, data conversion, date etc. scope of a variables and nested blocks. Variable declared in outer block is accessible in the inner blocks - but not the other way around. x integer; begin declare y integer; begin y := y + x; end; x := x + y; -- error end; Operators All SQL operators Logical, arithmetic, like, || % etc, ** Logical NOT true false false true null null AND 1 0 N 1 1 0 N 0 0 0 0 N N 0 N OR 1 0 N 1 1 1 1 0 1 0 N N T N N All operations in PL/SQL are solved in Precedence and Associativity. Programming guidelines. Chapter 3 Using DML ops in PL/SQL:: Revision to Select statment -- to read values in bind variables or PL/SQL variables. DECLARE X emp.ename%TYPE; BEGIN SELECT col1, col2 INTO var1, var2 FROM WHERE .; END Use bind variables for data input and then associate/use in DML Statements: slide 3.11, 3.12.. Exam questions MERGE - INSERTS OR UPDATES DATA INTO A NEW TABLE USING DATA FROM AN EXISTING TABLE USING SOME CONDITIONAL LOGIC. MERGE INTO <TABLENAME> USING <SRC TABLE NAME> ON < CONDITION USING COLUMNS> WHEN MATCHED THEN ....INSERT/UPDATE STATEMENT WHEN NOT MATCHED THEN ....INSERT/UPDATE STATEMENT END; / CURSOR ATTRIBUTES (IMPLICIT AND EXPLICIT CURSOR TYPES) ROWCOUNT FOUND NOTFOUND ISOPEN WORK WITH INSERT/UPDATE -- COMMIT/ROLLBACK. WORKING WITH CONTROL STRUCTURES IF, ELSE AND ELSIF IF CONDITION ACTION ELSE ACTION END IF; IF CONDITION1 ACTION1 ELSIF CONDITION2 ACTION2 ELSIF CONDITION3 ACTION3 ELSE ACTION4 END IF; CASE <varname> WHEN <VAL> THEN ACTION1; WHEN <VAL2> THEN ACTION2; WHEN <VAL3> THEN ACTION3; ELSE <DEFAULT ACTION> END; LOOPING CONSTRUCTS LOOP EXIT (WHEN CONDITION); END LOOP; WHILE (CONDITION) LOOP --PRE-TEST LOOP. END LOOP; FOR COUNTER IN LOW..HIGH LOOP END LOOP; FOR i in 1..22 loop --statements. end loop; EXIT WHEN CONDITION.. ACTION - WATCH VIDEO LECTURE FOR COMPOSITE DATATYPES - |
Whiteboard notes - July 2nd 2012 (Unedited)
Whiteboard from July 2nd 2012. Introduction PL/SQL Programming - Sukhjit Singh - plsql.sukhjit.tv Orientation - July 2nd 2012 >>About the course About Language and Setting up your environment Starting your labs. ..Cover the underlying topic concepts. This orientation is being recorded and running in lecture mode (for audio). If you have questions kindly type those in chat room. Notes Orientation Notes:: PL/SQL - Procedural Language SQL is an interpreted language -- Client and Server ..10 statements as a program block --> Put it in the server (Pre-compiled) From Client we simply execute it. Reduced the traffic between Client and Server Improve performance. Application Platform - SAP, PeopleSoft, JDEdward, Siebel... What will you learn after this course? PL/SQL Syn procedures, functions, triggers, pacakges, cursors manage these objects Working with Large Objects - Course Blocks Lang Basics Declaring Variables Writing simple statement and executing them Control Blocks (decision-making and looping) Data Structures Collection Managing Transactions Cursors Exception Handling Packages --> Procedure and Functions Triggers Large Objects 18 small units. ..Review the powerpoints and work on exercises. Learning by Doing. Accounts - Unix acct --> Oracle acct --> Setup files -- are on the website. Working with Oracle Environment: Unix acct --> Login --> Start sqlplus sqlplus - Oracle Id/pwd. (which instructor will provide). To setup your environment - look up the setup file on the website. Overview of PL/SQL. Oracle 4GL - Transact-SQL (MS SQL Server) Procedural SQL - used for Data Manipulation of record set (through usage of Procedures or Functions). PL/SQL Block --> Compiled to p-code --> Saved in the data dictionary. Client access --> Call the procedure --> Loads the p-code Procedural statement are executed by PL/SQL engine SQL Statements (that are part of Procedures) are executed by SQL Engine Benefits Performance Reduced I/O between Client and Server Code Manageability --> Blocks. Structured Programming --Modularize your code. Portability -- code xfer from one Oracle system to another. Exception Mgmt - Problem recovery Declaring Variables Anonymous Block DECLARE name CONSTANT varchar2(20) := 'Andrew'; SSN varchar(11) NOT NULL := DEFAULT '111-11-1111'; BEGIN EXCEPTION END; Learn all the datatypes Scalar binary integer pls integer long raw date --> Timestamp %TYPE name emp.name%TYPE; Boolean type True, false and null Composite datatype RECORD and VARRAYS Temp variable to store values from the db records to manipulate Rich Media - Large Objects text and binary. Bind Variables - Declare varibles in SQL/Plus Variable a DATE; PRINT a; Chapter 1 Chapter 2 - BEGIN and END Block. PL/SQL Statement Operators used in expressions. (pg 2-18) Interact with variables.(30+ operators) +, -, /, MOD, *, || etc. Scope Mgmt - Nested Blocks - values from inner blocks cannot be seen by outer. Outer block variable values are accessible by inner blocks. SQL Functions from chapter 4. TO_CHAR, TO_DATE.. Datatype conversion functions. Two exercises - Chapter 1 and 2. Send two text files (including test runs) --> deanzalabs@yahoo.com Start watching lecture for chapter 3 and 4. No review session on 7/4 - Meet on July 9th 2012. Weekly review sessions on Mon and Wed (8:15pm to 10:15pm) Email all registered students with conf. information. |
How can I download the Server Concepts Manual?
Go to the following link and http://download-west.oracle.com/docs/cd/B10501_01/nav/docindex.htm?remark=homepage and download the Oracle Concepts manual and SQL Reference Manual. Oracle 9i Documentation is also available at http://otn.oracle.com/documentation/oracle9i.html |
How can I format query results?
You can go through the attached document to get started with Formatting get result. |
| Attachments:
Formatting Query Results.htm
How can I get started with SQLPlus?
Go through the attached document - it should help you get started with PL/SQL. |
| Attachments:
FAQ.doc
How do I setup schema for Class Assignments?
Attached is a list of files with instructions to help you setup the schema for lab assignments out of the reader. You also have access to misc files that will be needed for other exercises for the rest of the quarter. |
| Attachments:
Schema Setup.zip
How to create unix account?
You have to be a registered student to be able to create unix account. Go to the following link - http://cis.deanza.edu/cis/overview.html and click on - Create your Bus/CIS Lab account. |
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