Home Database Mysql Tutorial Oracle之UTL_FILE 包用法详解

Oracle之UTL_FILE 包用法详解

Jun 07, 2016 pm 05:36 PM

UTL_FILE包可以用来读写操作系统上的文本文件,UTL_FILE提供了在客户端(FORM等等)和服务器端的文件访问功能。

UTL_FILE包可以用来读写操作系统上的文本文件,UTL_FILE提供了在客户端(FORM等等)和服务器端的文件访问功能。

创建测试目录:

新建一个command window;

创建目录:(以system用户登录数据库)

SQL> create or replace directory cux_log_dir as '/home/appltest/debug';

Directory created

赋权限。

SQL> grant read, write on directory cux_log_dir to public;

Grant succeeded

检查目录是否成功创建

select * FROM all_directories dir WHERE dir.DIRECTORY_NAME = 'CUX_LOG_DIR';

 

过程和函数:

  • FOPEN
  • 语法

    UTL_FILE.FOPEN (location IN VARCHAR2,

    filename IN VARCHAR2,

    open_mode IN VARCHAR2,

    max_linesize IN BINARY_INTEGER DEFAULT 1024)RETURN FILE_TYPE;

    Filename略。

    open_mode指明文件打开的模式。有如下几种:

    max_linesize指定文件文本每一行存放的最大字符数。

     

  • FCLOSE
  • 功能:关闭一个打开的文件。

     

  • FCLOSE_ALL

  • 结果为:


    结果为:

  • FCOPY
  • 语法

    UTL_FILE.FCOPY ( src_locationIN VARCHAR2,

    src_filenameIN VARCHAR2,

    dest_locationIN VARCHAR2,

    dest_filename IN VARCHAR2,

    start_lineIN BINARY_INTEGER DEFAULT 1,

    end_lineIN BINARY_INTEGER DEFAULT NULL);

     

    src_filename将要被复制的来源文件

    dest_location 被创建的目标文件存放的目录名。

    dest_filename 从来源文件创建的目标文件。

     

    测试程序之前:

    测试代码:

    测试程序之后:


  • FFLUSH
  • 语法

    UTL_FILE.FFLUSH (file IN FILE_TYPE);

     

  • FGETATTR
  • filename IN VARCHAR2,

    fexists OUT BOOLEAN,

    file_length OUT NUMBER,

    block_size OUT BINARY_INTEGER);

    block_size文件系统块的字节大小。

     

    测试:

     

    DECLARE
      l_loc        all_directories.directory_name%TYPE := 'CUX_LOG_DIR';
      l_file        utl_file.file_type;
      l_file_exsits BOOLEAN;
      l_file_length NUMBER;
      l_block_size  BINARY_INTEGER;
      l_buffer      VARCHAR2(1024);
    BEGIN
      utl_file.fgetattr(location    => l_loc,
                        filename    => 'l001.log',
                        fexists    => l_file_exsits,
                        file_length => l_file_length,
                        block_size  => l_block_size);
        IF l_file_exsits THEN
     
      l_file := utl_file.fopen(location  => l_loc,
                              filename  => 'l001.log',
                              open_mode => 'R');
      dbms_output.put_line('file exsits');
      dbms_output.put_line('file length:' || l_file_length);
      dbms_output.put_line('block sieze :' || l_block_size);
    END IF;
    utl_file.fclose_all;

    END;

    linux

    Statement of this Website
    The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

    Hot AI Tools

    Undresser.AI Undress

    Undresser.AI Undress

    AI-powered app for creating realistic nude photos

    AI Clothes Remover

    AI Clothes Remover

    Online AI tool for removing clothes from photos.

    Undress AI Tool

    Undress AI Tool

    Undress images for free

    Clothoff.io

    Clothoff.io

    AI clothes remover

    Video Face Swap

    Video Face Swap

    Swap faces in any video effortlessly with our completely free AI face swap tool!

    Hot Tools

    Notepad++7.3.1

    Notepad++7.3.1

    Easy-to-use and free code editor

    SublimeText3 Chinese version

    SublimeText3 Chinese version

    Chinese version, very easy to use

    Zend Studio 13.0.1

    Zend Studio 13.0.1

    Powerful PHP integrated development environment

    Dreamweaver CS6

    Dreamweaver CS6

    Visual web development tools

    SublimeText3 Mac version

    SublimeText3 Mac version

    God-level code editing software (SublimeText3)

    When might a full table scan be faster than using an index in MySQL? When might a full table scan be faster than using an index in MySQL? Apr 09, 2025 am 12:05 AM

    Full table scanning may be faster in MySQL than using indexes. Specific cases include: 1) the data volume is small; 2) when the query returns a large amount of data; 3) when the index column is not highly selective; 4) when the complex query. By analyzing query plans, optimizing indexes, avoiding over-index and regularly maintaining tables, you can make the best choices in practical applications.

    Explain InnoDB Full-Text Search capabilities. Explain InnoDB Full-Text Search capabilities. Apr 02, 2025 pm 06:09 PM

    InnoDB's full-text search capabilities are very powerful, which can significantly improve database query efficiency and ability to process large amounts of text data. 1) InnoDB implements full-text search through inverted indexing, supporting basic and advanced search queries. 2) Use MATCH and AGAINST keywords to search, support Boolean mode and phrase search. 3) Optimization methods include using word segmentation technology, periodic rebuilding of indexes and adjusting cache size to improve performance and accuracy.

    Can I install mysql on Windows 7 Can I install mysql on Windows 7 Apr 08, 2025 pm 03:21 PM

    Yes, MySQL can be installed on Windows 7, and although Microsoft has stopped supporting Windows 7, MySQL is still compatible with it. However, the following points should be noted during the installation process: Download the MySQL installer for Windows. Select the appropriate version of MySQL (community or enterprise). Select the appropriate installation directory and character set during the installation process. Set the root user password and keep it properly. Connect to the database for testing. Note the compatibility and security issues on Windows 7, and it is recommended to upgrade to a supported operating system.

    Difference between clustered index and non-clustered index (secondary index) in InnoDB. Difference between clustered index and non-clustered index (secondary index) in InnoDB. Apr 02, 2025 pm 06:25 PM

    The difference between clustered index and non-clustered index is: 1. Clustered index stores data rows in the index structure, which is suitable for querying by primary key and range. 2. The non-clustered index stores index key values ​​and pointers to data rows, and is suitable for non-primary key column queries.

    What are some popular MySQL GUI tools (e.g., MySQL Workbench, phpMyAdmin)? What are some popular MySQL GUI tools (e.g., MySQL Workbench, phpMyAdmin)? Mar 21, 2025 pm 06:28 PM

    Article discusses popular MySQL GUI tools like MySQL Workbench and phpMyAdmin, comparing their features and suitability for beginners and advanced users.[159 characters]

    How do you handle large datasets in MySQL? How do you handle large datasets in MySQL? Mar 21, 2025 pm 12:15 PM

    Article discusses strategies for handling large datasets in MySQL, including partitioning, sharding, indexing, and query optimization.

    MySQL: Simple Concepts for Easy Learning MySQL: Simple Concepts for Easy Learning Apr 10, 2025 am 09:29 AM

    MySQL is an open source relational database management system. 1) Create database and tables: Use the CREATEDATABASE and CREATETABLE commands. 2) Basic operations: INSERT, UPDATE, DELETE and SELECT. 3) Advanced operations: JOIN, subquery and transaction processing. 4) Debugging skills: Check syntax, data type and permissions. 5) Optimization suggestions: Use indexes, avoid SELECT* and use transactions.

    The relationship between mysql user and database The relationship between mysql user and database Apr 08, 2025 pm 07:15 PM

    In MySQL database, the relationship between the user and the database is defined by permissions and tables. The user has a username and password to access the database. Permissions are granted through the GRANT command, while the table is created by the CREATE TABLE command. To establish a relationship between a user and a database, you need to create a database, create a user, and then grant permissions.

    See all articles