().child(‘users‘).push({
username: name,
email: email
}); this.updateMe("Yoona", "[emailprotected]", ref.key);
} // calling this.appendOneMoreUser("Yuri", ‘[emailprotected]‘, null);
So under "Users" node, we want to append one new node, the UID would be generated randomly.
The "ref" object contains "key" prop which ref to the UID in the database.
Update one node:update ()
Auto-configuration database_console version Restore database, Database Console
Error message:
Configuration:
Cause: the database name "5" is not the actual logical name of the database backup file named "Sdzn"
View the actual logical name of the
Error message:Configuration:Cause: The database name "5" is not the actual logical name of the database backup file named "SDZN"View the actual logical name of the database backup file named "SDZN":It can be seen from the above that "5" should be changed to "Sdznsmartcloudedu_empty"【 Note:There are 3 names in SQL Server:
Label:Error message:Configuration:Cause: The database name "5" is not the actual logical name of the database backup file named "SDZN"View the actual logical name of the database backup file named "SDZN":It can be seen from the above that "5" should be changed to "Sdznsmartcloudedu_empty"【 Note:In SQL Server, there is a common 3 name:
Tags: mysql consoleFault code: mysql> INSERT INTO T1 (name,sex,age,address) VALUES (' Zhang San ', ' Male ', 11, ' Shahe ');
ERROR 1366 (HY000): Incorrect string value: ' \xd5\xc5\xc8\xfd ' for column ' name ' at
Row 1 This failure is caused by data insertion failure due to inconsistent Chinese encoding. In general, the MySQL database in the insertion of Chinese information error is not the case of Chinese code inconsistency. And currently supports
After installing Bugfree with XAMPP, log in phpMyAdmin, find that the Bugfree database is not displayed, and after using the MySQL console query, it is found that there is a Bugfree database, as shown in:650) this.width=650; "Src=" Http://s5.51cto.com/wyfs02/M02/8C/27/wKiom1hjcODyQAB4AAD0qYOVgqk694.png-wh_500x0-wm_3 -wmp_4-s_3368998565.png "title="
oracle| Control | data | database
A few days ago a database instance was created successfully and can be started in sqlplus, but it is not possible to login in the Admin control tool. Today I tried to solve this problem, the result is still successful, the solution is as follows:
1, modify [Oraclehome]/network/admin/tnsnames.ora file, add a service name in it, do not write with CTRL + C and CTRL + + then
21,200 9 2:26:15 AM
3. view the dbconsole status and access address
Oracle@www.bkjia.com ~ $ Emctl status dbconsole
TZ set to PRCOracle Enterprise Manager 10g Database Control Release 10.2.0.4.0Copyright (c) 1996,200 7 Oracle Corporation. All rights reserved.Https://www.bkjia.com: 5502/em/console/aboutApplication # access addressOracle Enterprise Manager 10g is running.-------------------------------------
Log in to the PostgreSQL database console
Psql database name
Login successful Display
[zpf@kevin ~]$ psql postgrespsql (9.4.1)Type"help"for help.postgres=#
Create DATABASE User xxx
CREATE USER xxx WITH PASSWORD ‘xxxxxx‘;
Create a database
When inserting mysql database Chinese information in the cmd console, the insertion failure solution is as follows: mysql Chinese Information
Fault code:
Mysql> insert into t1 (name, sex, age, address) values ('zhang san', 'male', 11, 'shahe '); ERROR 1366 (HY000 ): incorrect string value: '\ xD5 \ xC5 \ xC8 \ xFD' for column 'name' at row 1
This fault is caused by data insertion failure due to inconsist
Label: If there's anything wrong with compiling the program, I hope you'll correct me.The database, rack package, and Java source files required for code execution are uploaded to the file filename sql_jdbc.zipBefore you use the My Eclipse console to manipulate the database (SQL 2008), you should introduce a rack package (Sqljdbc4.jar) before the rack package
Availableconnectioncount doesn't become a word, the connection that your page creates is closed, and if his value is reduced, then how much is reduced, indicating how many connections you have not released!! If possible, it is best to test each page and release it completely! And the value of Maxconnectionsinusecount and Availableconnectioncount corresponds: The former reduction of how much, the latter increase how much!!! and Maxconnectionsinusecount + Availableconnectioncount = MaxSize They
Tags: technology sharing command Download login auth mysq tar for SQL database1. Download putty, unzip the operation;2. Configure Putty:Session->hostname (Input host IP, port)->savedsession (a name, such as: abc123)->save (save);Connection, Data->auto-login username (enter the host user name to login, such as: Ikukun);Connection, SSH, auth->private key file for authentication (load the corresponding host user's private key);Connection, SSH-Tunnels->add a forward port (Source port:8888,distinatio
Tags: ror erro man data-copyright strong 1.2 pre starWhen you landed em, you gave me this mistake. Code d ' Erreur:ssl_error_weak_server_cert_key Just need to turn off EM SSL. [Email protected] ~]$ Emctl unsecure dbconsoleOracle Enterprise Manager 11g Database Control Release 11.2.0.1.0Copyright (c) 1996, Oracle Corporation. All rights reserved.Https://ace:1158/em/console/aboutApplicationConfiguring Dbco
A database instance was created a few days ago and can be started in sqlplus, but login cannot be used in management and control tools. Today, I tried to solve this problem and the result was still successful. The solution is as follows:
1. Modify [oraclehome]/Network/admin/tnsnames. add a service name in the ora file. You do not need to write Ctrl + C or Ctrl + V and then modify the service name.
2. Modify the [oraclehome]/Network/admin/listener. o
21,200 9 2:26:15 AM
3. view the dbconsole status and access address
[Oracle @ devrfel501 ~] $ Emctl status dbconsole
TZ set to PRCOracle Enterprise Manager 10g Database Control Release 10.2.0.4.0Copyright (c) 1996,200 7 Oracle Corporation. All rights reserved.Https: // devrfel501: 5502/EM/console/aboutapplication # access addressOracle Enterprise Manager 10g is running.------------------------------------
The simple configuration of log4j makes log4j more and more applications: the log4j configuration file provides a full set of functions such as output to the console, files, rollback files, sending log emails, output to database log tables, and custom tags. Log4j is enough if you choose one or two of them. rootlogger = debug, console, A1, Im log4j.addivity.org. a
Unable to log on to the ORACLE database consoleThis error is reported to me when I log on to EM.
Code d 'erreur: ssl_error_weak_server_cert_key
You only need to disable the SSL of EM.
[Oracle @ ace-PROD1 ~] $ Emctl unsecure dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.2.0.1.0
Copyright (c) 1996,200 9 Oracle Corporation. All rights reserved.
Https: // ace: 1158/em/
Label:Database on the program is becoming more and more important, the following is the basic operation of the data,Program Design (1)Query operations for data (2)Show insertion Results (3)Database modification Operations (4)Show modified content (5)Data deletion operations (6)--------------------------------------------------------------------------------------------------------------- -----------------------------------------------------------------
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