需求:把oracle数据库中符合条件的N多表,导出成csv文本文件,并以表名.csv为文件名存放。 实现:通过存储过程中UTL_FILE函数来实
需求:把Oracle数据库中符合条件的N多表,导出成csv文本文件,并以表名.csv为文件名存放。
实现:通过存储过程中UTL_FILE函数来实现。导出的csv文件放入提前创建好的directory中。
Oracle AWR报告生成与查看
在CentOS 6.4下安装Oracle 11gR2(x64)
Oracle 11gR2 在VMWare虚拟机中安装步骤
Debian 下 安装 Oracle 11g XE R2
Oracle AWR报告生成步骤
Oracle数据库表导出和导入csv文件操作
使用方法:使用以下命令数据预执行的SQL脚本
SELECT 'EXEC sql_to_csv(''select * from ' ||T.TABLE_NAME ||
''',''OUT_PUT_CSV''' || ',''ODS_MDS.' || T.TABLE_NAME ||
'.csv'');'
FROM user_TABLES T
脚本说明:sql_to_csv 存储过程名;out_put_csv数据库目录名称;ODS_MDS预定义的schema名称;
存储过程代码如下:
CREATE OR REPLACE PROCEDURE CHENQY.SQL_TO_CSV
(
P_QUERY IN VARCHAR2, -- PLSQL文
P_DIR IN VARCHAR2, -- 导出的文件放置目录
P_FILENAME IN VARCHAR2 -- CSV名
)
IS
L_OUTPUT UTL_FILE.FILE_TYPE;
L_THECURSOR INTEGER DEFAULT DBMS_SQL.OPEN_CURSOR;
L_COLUMNVALUE VARCHAR2(4000);
L_STATUS INTEGER;
L_COLCNT NUMBER := 0;
L_SEPARATOR VARCHAR2(1);
L_DESCTBL DBMS_SQL.DESC_TAB;
P_MAX_LINESIZE NUMBER := 32000;
BEGIN
--OPEN FILE
L_OUTPUT := UTL_FILE.FOPEN(P_DIR, P_FILENAME, 'W', P_MAX_LINESIZE);
--DEFINE DATE FORMAT
EXECUTE IMMEDIATE 'ALTER SESSION SET NLS_DATE_FORMAT=''YYYY-MM-DD HH24:MI:SS''';
--OPEN CURSOR
DBMS_SQL.PARSE(L_THECURSOR, P_QUERY, DBMS_SQL.NATIVE);
DBMS_SQL.DESCRIBE_COLUMNS(L_THECURSOR, L_COLCNT, L_DESCTBL);
--DUMP TABLE COLUMN NAME
FOR I IN 1 .. L_COLCNT LOOP
UTL_FILE.PUT(L_OUTPUT,L_SEPARATOR || '"' || L_DESCTBL(I).COL_NAME || '"'); --输出表字段
DBMS_SQL.DEFINE_COLUMN(L_THECURSOR, I, L_COLUMNVALUE, 4000);
L_SEPARATOR := ',';
END LOOP;
UTL_FILE.NEW_LINE(L_OUTPUT); --输出表字段
--EXECUTE THE QUERY STATEMENT
L_STATUS := DBMS_SQL.EXECUTE(L_THECURSOR);
--DUMP TABLE COLUMN VALUE
WHILE (DBMS_SQL.FETCH_ROWS(L_THECURSOR) > 0) LOOP
L_SEPARATOR := '';
FOR I IN 1 .. L_COLCNT LOOP
DBMS_SQL.COLUMN_VALUE(L_THECURSOR, I, L_COLUMNVALUE);
UTL_FILE.PUT(L_OUTPUT,
L_SEPARATOR || '"' ||
TRIM(BOTH ' ' FROM REPLACE(L_COLUMNVALUE, '"', '""')) || '"');
L_SEPARATOR := ',';
END LOOP;
UTL_FILE.NEW_LINE(L_OUTPUT);
END LOOP;
--CLOSE CURSOR
DBMS_SQL.CLOSE_CURSOR(L_THECURSOR);
--CLOSE FILE
UTL_FILE.FCLOSE(L_OUTPUT);
EXCEPTION
WHEN OTHERS THEN
RAISE;
END;
/
本文永久更新链接地址:

How to effectively monitor MySQL performance? Use tools such as mysqladmin, SHOWGLOBALSTATUS, PerconaMonitoring and Management (PMM), and MySQL EnterpriseMonitor. 1. Use mysqladmin to view the number of connections. 2. Use SHOWGLOBALSTATUS to view the query number. 3.PMM provides detailed performance data and graphical interface. 4.MySQLEnterpriseMonitor provides rich monitoring functions and alarm mechanisms.

The difference between MySQL and SQLServer is: 1) MySQL is open source and suitable for web and embedded systems, 2) SQLServer is a commercial product of Microsoft and is suitable for enterprise-level applications. There are significant differences between the two in storage engine, performance optimization and application scenarios. When choosing, you need to consider project size and future scalability.

In enterprise-level application scenarios that require high availability, advanced security and good integration, SQLServer should be chosen instead of MySQL. 1) SQLServer provides enterprise-level features such as high availability and advanced security. 2) It is closely integrated with Microsoft ecosystems such as VisualStudio and PowerBI. 3) SQLServer performs excellent in performance optimization and supports memory-optimized tables and column storage indexes.

MySQLmanagescharactersetsandcollationsbyusingUTF-8asthedefault,allowingconfigurationatdatabase,table,andcolumnlevels,andrequiringcarefulalignmenttoavoidmismatches.1)Setdefaultcharactersetandcollationforadatabase.2)Configurecharactersetandcollationfor

A MySQL trigger is an automatically executed stored procedure associated with a table that is used to perform a series of operations when a specific data operation is performed. 1) Trigger definition and function: used for data verification, logging, etc. 2) Working principle: It is divided into BEFORE and AFTER, and supports row-level triggering. 3) Example of use: Can be used to record salary changes or update inventory. 4) Debugging skills: Use SHOWTRIGGERS and SHOWCREATETRIGGER commands. 5) Performance optimization: Avoid complex operations, use indexes, and manage transactions.

The steps to create and manage user accounts in MySQL are as follows: 1. Create a user: Use CREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password'; 2. Assign permissions: Use GRANTSELECT, INSERT, UPDATEONmydatabase.TO'newuser'@'localhost'; 3. Fix permission error: Use REVOKEALLPRIVILEGESONmydatabase.FROM'newuser'@'localhost'; then reassign permissions; 4. Optimization permissions: Use SHOWGRA

MySQL is suitable for rapid development and small and medium-sized applications, while Oracle is suitable for large enterprises and high availability needs. 1) MySQL is open source and easy to use, suitable for web applications and small and medium-sized enterprises. 2) Oracle is powerful and suitable for large enterprises and government agencies. 3) MySQL supports a variety of storage engines, and Oracle provides rich enterprise-level functions.

The disadvantages of MySQL compared to other relational databases include: 1. Performance issues: You may encounter bottlenecks when processing large-scale data, and PostgreSQL performs better in complex queries and big data processing. 2. Scalability: The horizontal scaling ability is not as good as Google Spanner and Amazon Aurora. 3. Functional limitations: Not as good as PostgreSQL and Oracle in advanced functions, some functions require more custom code and maintenance.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

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

Hot Article

Hot Tools

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

Zend Studio 13.0.1
Powerful PHP integrated development environment

SublimeText3 Linux new version
SublimeText3 Linux latest version

Atom editor mac version download
The most popular open source editor

SublimeText3 English version
Recommended: Win version, supports code prompts!