Shulou(Shulou.com)06/01 Report--

What kind of software is PL / SQL? What are the characteristics? Many people don't know much about it. Today, in order to let you know more about PL / SQL, I have summarized the following contents. Let's read on.

PL / SQL is an extension of structured query language (SQL); unlike SQL, it allows programmers to write code in a procedural format. It combines the data processing power of SQL and the processing power of process language, and can create super powerful SQL queries.

A brief introduction to PL / SQL

PL / SQL is a highly structured and readable language. Its construction clearly expresses the intention of the code. In addition, PL / SQL is a direct learning language.

PL / SQL is a standard and portable language for Oracle database development. If you are executing a program on an Oracle database, you can quickly move it to another compatible Oracle database without making any changes.

PL / SQL is an embedded language. PL / SQL can only be executed in the Oracle database and cannot run PL / SQL programs on systems that do not have an Oracle database.

PL / SQL is a high performance and highly integrated database language. In addition to PL / SQL, you can use other programming languages, such as Java,C# and C + +. However, when interacting with Oracle databases, it is easier to write efficient code in PL / SQL than in other programming languages.

Architecture of PL / SQL

The PL / SQL architecture consists of three main components, so let's take a brief look at it:

PL / SQL block structure

1. Block is the basic unit of programming in PL / SQL, which encapsulates a set of executable statements to meet the business requirements of programmers.

2. It includes different parts of the code for logical division (the declaration part for declaration purposes, the execution part of the statement, and the exception handling part for handling errors).

3. It also contains SQL instructions for interacting with the database server.

4. All PL / SQL units are treated as PL / SQL blocks, which is the initial phase of the architecture as the primary input.

PL / SQL engine

1. The PL / SQL engine is the component that actually processes the code.

2. It is responsible for compiling PL / SQL code into bytecode and executing executable code

3. It can be installed in database server and application server.

4. The PL / SQL engine separates the PL / SQL unit and the SQL part in the input, and the separated PL / SQL unit will be processed by the PL / SQL engine itself.

5. It sends the SQL part to the database server, where it actually interacts with the database.

Note: the PL / SQL engine can only be installed in application development tools such as Oracle database server or Oracle Forms.

Database server

1. The database server is the most important component in the Pl / SQL unit that stores data.

2. It consists of a SQL executor, which parses the input SQL statement and performs the same operation.

3. The PL / SQL engine uses the SQL in the PL / SQL unit to interact with the database server.

The following is a graphical representation of the PL / SQL architecture.

Characteristics of PL / SQL

1. Avoid calling overhead by executing SQL statements in batches rather than providing high performance separately.

2. Create complex business logic into a single program unit to promote encapsulation and productivity.

3. SQ??L is very tightly integrated to reduce maintenance and complexity.

4. Full portability-PL / SQL code written in one operating system can be successfully migrated to another operating system running Oracle.

5. The encryption and decryption logic provided by Oracle built-in software package supports high security.

6. Interaction with other programming languages.

7. Applications written in PL / SQL can be portable on any platform that supports Oracle.

8. By using advanced PL / SQL concepts such as bulk collection and FORALL, context switching overhead can be avoided.

9. Implement object-oriented programming concepts, such as overloading.

What kind of software is PL / SQL? What are the details of the characteristics? is there anything to gain after reading it? If you want to know more about it, welcome to the industry information!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.