Database Administrator

CRUD operation of mybatis, Silicon Valley-mybatiscrud Project Structure: User entity code: package com.atguigu.mybatis.bean;public class User {private int id;private String name;private int age;public User() {super();}public User(int id, String

Full Set of Vue usage methods and vue usage New recruits transferred from an Oracle DBA to Mongodb follow the Oracle Learning Style Start to share some MongoDB management experience: 1. Export vue data After a normal connection, such as data,

Asian Cup with database creation-wish the Chinese team and the Chinese team for database creation Original Works are from the blog of "Deep Blue blog". You are welcome to reprint them. Please note the following source when reprinting them. Otherwise,

JDBC stores and reads binary data, and jdbc stores binary data. The following JSP files are uploaded using the common-fileupload component and stored in the database as binary files. list = diskFileUpload. parseRequest (request); for (FileItem

The group_concat function is used in report development. When using report tools such as Jasper or BIRT, some unconventional statistics are often encountered, and the report tools or SQL statements are difficult to process, such as in MSSQL/Oracle,

Atitit. Summary of the structure and storage database attilax of various data types (tree structure, table-shaped data), atititattilax Atitit. Summary of the structure and storage database attilax of various data types (tree structure and table data)

Locate the specific datafile on which row data is stored in the table and which datafile Subtitle: uses a PL/SQL statement to locate the specific datafile in which row data is stored in the table. A dba may often ask you how to know which data file

Deployment and use of the NoSql database Redis in ubuntu, nosqlredis I. Redis introduction: NoSql and No Only SQL are highly concurrent and ultra-large data exist, different from relational databases. Yes: Non-relational, distributed, open-source,

Oracle exp exports a large number of tables and the table structure. oracleexp The requirement is: to export the structure of a specified 3 thousand tables, This is generally the case, but the problem is that the table is very large and won't

Oracle object-oriented and set, oracle object-oriented This is a summary of my recent learning experience. 1. oracle object-oriented We all know that SQL is set-oriented, but it is undeniable that there are many places in oracle that reflect the

Java environment variable configuration and java environment variable configuration Original Works are from the blog of "Deep Blue blog". You are welcome to reprint them. Please note the following source when reprinting them. Otherwise, you will be

An example describes Oracle All subqueries, and oracleall subqueries. Problem:The employee names, jobs, and salaries that are higher than the salaries of all salespeople are queried. Analysis:ANY can represent ANY, but this problem requires higher

11. Create and authorize mysql users. 11. mysql 1. Create a user. // Log on to MYSQL@> Mysql-u root-p@> Password// Create a userMysql> insert into mysql. user (Host, User, Password) values ("localhost", "abc", password ("1234 "));// Refresh the

10gR2 terware simple installation steps, 10gr2clusterware1. Install the Operating System (omitted)Note: I use the OEL 5u5 version here. Because it comes with the environment variable installation package provided by Oracle, It is very convenient to

Oracle lock 2: DML operations and locks, oracle lock dml operations Oracle automatically acquires row locks and table locks for DML operations. The operation type determines the lock action. The following section summarizes the DML operation locks:

Add photos to the database and add photos to the databaseAuthor:Www.gudianxiaoshuo.comThis article is organized by the Code Assistant Software and released content is irrelevant to this software.More comfortable reading, more comfortable writing,

[HTTP: 101216] Servlet: "FICMaster" failed to preload on startup in Web application, 101216 ficmaster I recently obtained an Oracle OFSAA software, which encountered a problem during program deployment. Currently, knowledge sharing of ofsaa on the

Substr usage, substr Sqlplus conn user/user -- connect to database Show user -- display the current user Select upper (substr ('liufeng',) as firstname, lower (substr ('liuyuehui', 4) as secondname from dual; -- display name Substr ('string',

The difference between select count (*) and select count (1) and the difference in efficiency, selectcount  Generally, the returned results are the same for Select Count (*) and Select Count (1 ).    If the table does not have a Primary key, count

Two SQL questions and two SQL statements Department weekly schedule hr_1_planweek: DepartMent name, which is the DepartMent ID. Department table g_group: Gname Department name, gid department id Modify the DepartMent field of the g_group table