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plsql #plsql

Table of Contents

About1

Chapter 1: Getting started with plsql2

Remarks2

Examples2

Definition of PLSQL2

Hello World3

About PLSQL3

Difference between %TYPE and %ROWTYPE.4

Create or replace a view4

Create a table5

Chapter 2: Assignments model and language6

Examples6

Assignments model in PL/SQL6

Chapter 3: Bulk collect8

Examples8

Bulk data Processing8

Chapter 4: Collections and Records9

Examples9

Use a collection as a return type for a split function9

Chapter 5: Cursors10

Syntax10

Remarks10

Examples10

Parameterized "FOR loop" Cursor10

Implicit "FOR loop" cursor10

Working with SYS_REFCURSOR11

function returning a cursor11 and how to use it:11

Handling a CURSOR12

Chapter 6: Exception Handling13

Introduction13

Examples13

Exception handling13

Syntax13

Internally defined exceptions14

Predefined exceptions15

User defined exceptions16

Define custom exception, raise it and see where it comes from16

Handling connexion error exceptions18

Chapter 7: Exception Handling19

Introduction19

Examples19

Handling connexion error exceptions19

Define custom exception, raise it and see where it comes from20

Chapter 8: Functions22

Syntax22

Examples22

Generate GUID22

Calling Functions22

Chapter 9: IF-THEN-ELSE Statement24

Syntax24

Examples24

IF-THEN24

IF-THEN-ELSE24

IF-THEN-ELSIF-ELSE25

Chapter 10: Loop26

Syntax26

Examples26

Simple Loop26

WHILE Loop26

FOR Loop27

Chapter 11: Object Types29

Remarks29

Examples29

BASE_TYPE29

MID_TYPE30

LEAF_TYPE31

Accessing stored objects32

Chapter 12: Packages34

Syntax34

Examples35

Package Usage36

Overloading36

Restrictions on Overloading37

Define a Package header and body with a function.37

Chapter 13: PLSQL procedure39

Introduction39

Examples39

Syntax39

Hello World39

In/Out Parameters40

Chapter 14: Triggers41

Introduction41

Syntax41

Examples41

Before INSERT or UPDATE trigger41

Credits43

About You can share this PDF with anyone you feel could benefit from it, downloaded the latest version from: plsql

It is an unofficial and free plsql ebook created for educational purposes. All the content is extracted

from Stack Overflow Documentation, which is written by many hardworking individuals at Stack Overflow. It is neither affiliated with Stack Overflow nor official plsql. The content is released under Creative Commons BY-SA, and the list of contributors to each chapter are provided in the credits section at the end of this book. Images may be copyright of their respective owners unless otherwise specified. All trademarks and registered trademarks are the property of their respective company owners. Use the content presented in this book at your own risk; it is not guaranteed to be correct nor accurate, please send your feedback and corrections to info@zzzprojects.com https://riptutorial.com/1

Chapter 1: Getting started with plsql

Remarks

This section provides an overview of what plsql is, and why a developer might want to use it.

It should also mention any large subjects within plsql, and link out to the related topics. Since the

Documentation for plsql is new, you may need to create initial versions of those related topics.

Examples

Definition of PLSQL

PL/SQL (Procedural Language/Structured Query Language) is Oracle Corporation's procedural extension for SQL and the Oracle relational database. PL/SQL is available in Oracle Database (since version 7), TimesTen in-memory database (since version 11.2.1), and IBM DB2 (since version 9.7). The basic unit in PL/SQL is called a block, which is made up of three parts: a declarative part, an executable part, and an exception-building part. Declarations - This section starts with the keyword DECLARE. It is an optional section and defines all variables, cursors, subprograms, and other elements to be used in the program. Executable Commands - This section is enclosed between the keywords BEGIN and END and it is a mandatory section. It consists of the executable PL/SQL statements of the program. It should have at least one executable line of code, which may be just a NULL command to indicate that nothing should be executed. Exception Handling - This section starts with the keyword EXCEPTION. This section is again optional and contains exception(s) that handle errors in the program. Every PL/SQL statement ends with a semicolon (;). PL/SQL blocks can be nested within other

PL/SQL blocks using BEGIN and END.

In anonymous block, only executable part of block is required, other parts are not nessesary. Below is example of simple anonymous code, which does not do anything but perform without error reporting. https://riptutorial.com/2 Missing excecutable instruction leads to an error, becouse PL/SQL does not support empty blocks. For example, excecution of code below leads to an error:

Application will raise error:

Symbol " * " in line below keyword "END;" means, that the block which ends with this block is empty or bad constructed. Every execution block needs instructions to do, even if it does nothing, like in our example.

Hello World

Command is required in SQL*Plus and SQL Developer clients to enable the output of . Without the command nothing is displayed. The line signals the end of the anonymous PL/SQL block. To run the code from SQL command line, you may need to type at the beginning of the first blank line after the last line of the code. When the above code is executed at SQL prompt, it produces the following result:

About PLSQL

https://riptutorial.com/3 PL/SQL stands for Procedural Language extensions to SQL. PL/SQL is available only as an "enabling technology" within other software products; it does not exist as a standalone language. You can use PL/SQL in the Oracle relational database, in the Oracle Server, and in client-side application development tools, such as Oracle Forms. Here are some of the ways you might use

PL/SQL:

To build stored procedures. .1.

To create database triggers.2.

To implement client-side logic in your Oracle Forms application.3. To link a World Wide Web home page to an Oracle database.4.

Difference between %TYPE and %ROWTYPE.

: Used to declare a field with the same type as that of a specified table's column. %ROWTYPE: Used to declare a record with the same types as found in the specified table, view or cursor (= multiple columns).

Create or replace a view

In this example we are going to create a view.

A view is mostly used as a simple way of fetching data from multiple tables.

Example 1:

View with a select on one table.

https://riptutorial.com/4

Example 2:

View with a select on multiple tables.

To call this views in a query you can use a select statement.

Create a table

Below we are going to create a table with 3 columns.

The column must be filled is, so we define it .

On the column we also add a check so that the only value allowed is 'Y' or 'N'. If an insert in done and this column is not specified during the insert then default a 'N' is inserted.

Read Getting started with plsql online: https://riptutorial.com/plsql/topic/1962/getting-started-with-

plsql https://riptutorial.com/5

Chapter 2: Assignments model and language

Examples

Assignments model in PL/SQL

All programming languages allow us to assign values to variables. Usually, a value is assigned to variable, standing on left side. The prototype of the overall assignment operations in any contemporary programming language looks like this: This will assign right operand to the left operand. In PL/SQL this operation looks like this: Left operand must be always a variable. Right operand can be value, variable or function: When the code block is executed in SQL*Plus the following output is printed in console:

There is a feature in PL/SQL that allow us to assign "from right to the left". It's possible to do in

SELECT INTO statement. Prototype of this instrunction you will find below: https://riptutorial.com/6 This code will assign character literal to a local variable: When the code block is executed in SQL*Plus the following output is printed in console: Asignment "from right to the left" is not a standard, but it's valuable feature for programmers and users. Generally it's used when programmer is using cursors in PL/SQL - this technique is used, when we want to return a single scalar value or set of columns in the one line of cursor from SQL cursor.

Further Reading:

Assigning Values to Variables•

Read Assignments model and language online:

https://riptutorial.com/7

Chapter 3: Bulk collect

Examples

Bulk data Processing

local collections are not allowed in select statements. Hence the first step is to create a schema level collection. If the collection is not schema level and being used in SELECT statements then it would cause "PLS-00642: local collection types not allowed in SQL statements" --Grant permissions on collection so that it could be used publically in database --fetching data from table into collection and then loop through the collection and print the data. Read Bulk collect online: https://riptutorial.com/plsql/topic/6855/bulk-collect https://riptutorial.com/8

Chapter 4: Collections and Records

Examples

Use a collection as a return type for a split function It's necessary to declare the type; here ; a collection is a Here's the function. Notice the used as a kind of constructor, and the and keywords that help you create and grow your collection; Then you can see the content of the collection with the function from SQL; it can be used as a list inside a SQL statement: Read Collections and Records online: https://riptutorial.com/plsql/topic/9779/collections-and- records https://riptutorial.com/9

Chapter 5: Cursors

Syntax

Cursor cursor_name Is your_select_statement•

Cursor cursor_name(param TYPE) Is your_select_statement_using_param•

FOR x in (your_select_statement) LOOP ...•

Remarks

Declared Cursors are difficult to use, and you should prefer loops in most cases. What's very interesting in cursors compared to simple loops, is that you can parameterize them. It's better to avoid doing loops with PL/SQL and cursors instead of using Oracle SQL anyway. However, For people accustomed to procedural language, it can be far easier to understand. If you want to check if a record exists, and then do different things depending on whether the record exists or not, then it makes sense to use statements in pure ORACLE SQL queries instead of using cursor loops. (Please note that is only available in Oracle releases >= 9i).

Examples

Parameterized "FOR loop" Cursor

Implicit "FOR loop" cursor

First advantage is there is no tedious declaration to do (think of this horrible "CURSOR" thing you had in previous versions)•quotesdbs_dbs17.pdfusesText_23

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