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  What is the difference between # and $in mybatis?

  # means that precompilation is used to prevent sql injection. And $is not. Use # to default the passed parameter to a string. While $will not, whatever is passed in is what is passed in. $is generally used to pass in database objects, such as table names. If you pass in a Date type, use #. Ps:

  2022-06-01 09:14:30 Views: 253
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  LAMP Architecture introduction, MYSQL introduction, installation

  LAMP architecture LAMP refers to the abbreviations of Linux (operating system), Apache (httpd server), MySQL (database software), and PHP (sometimes Per or Python). It is generally used to set up a web server (the three roles can be found in the

  2022-06-01 09:14:27 Views: 213
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  The Construction of RAC by Oracle 11gR2 (3)-- Environment Detection before installing grid

  Construction of RAC by Oracle 11gR2 (3)-- Environment detection system environment before installing grid: operating system: RedHat EL5Cluster: Oracle GI (Grid Infrastructure) Oracle:

  2022-06-01 09:14:24 Views: 231
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  Important Index contents of oracle performance diagnosis and Analysis

  For the database usage environment, the problems in the use of the database may be caused by any one of the components such as table space, file system, data file, process, etc., or even the poor performance of a certain SQL statement may cause system performance problems. Therefore, when there is a problem with the database, thoroughly investigate the problem

  2022-06-01 09:14:23 Views: 204
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  MHA profile parameters

  # collate MHA parameters 19:58:41 readings: 822MHA configuration file parameter Parameter NameRequired?Parameter ScopeDefault Valuehos

  2022-06-01 09:14:23 Views: 279
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  MySql-BlackHole: black Hole engine

  Check the output of SHOW ENGINES; or SHOW VARIABLES LIKE 'have%'; to see if previous versions of mysql support this engine. Mysql > show engines;+-

  2022-06-01 09:14:23 Views: 295
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  Zabbix 3.2 add Oracle tablespace monitoring

  Check the blog post: http://7424593.blog.51cto.com/7414593/1910111?utm_source=tuicool&utm_medium=referral Note: in zabbix

  2022-06-01 09:14:18 Views: 285
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  RAID reorganization and Database data repair and Verification

  Background introduction: IBM DS5020 optical fiber storage. A total of 16 FC hard drives are stored, with a capacity of 600g per disk. Storage front panel No. 10 and 13 hard drives turn on the fault light, the volume on which the storage is mapped to the redhat cannot be mounted, and the business crashes. Get to work: through IBM

  2022-06-01 09:14:18 Views: 270
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  Oracle rman recovery data file path is inconsistent

  a. If the backed up database is accessible, execute the production conversion script: select 'set newname for datafile' | | file# | |'to''| | replace (name)

  2022-06-01 09:14:18 Views: 284
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  Configuration Management of SaltStack practice-Jinja2 template

  Configuration Management in SaltStack practice-Jinja2 template Learning SaltStackSaltStack practice configuration Management-Jinja2 template 1. Salt yaml configuration file uses Jinja2 template to introduce 1.1 File status

  2022-06-01 09:14:17 Views: 286
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  MongoDB usage Summary Series 2

  Because I am accustomed to using relational database, I feel that the flexibility of SQL statement to operate on data is needless to say and easy to understand and grasp, but after starting to use MongoDB, it is always awkward to operate on some data on the client command line, always prompting syntax errors, although RockM

  2022-06-01 09:14:17 Views: 257
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  Oracle installation notes

  Modify the hostname [root@oracledb ~] # sed-I "s/HOSTNAME=localhost.localdomain/HOSTNAME=oracledb/" / etc/sysconfig/

  2022-06-01 09:14:17 Views: 234
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  The use of MySQL under Linux

  Use of MySQL under Linux 1. Install mysql command: sudo apt-get install-y mysql-server2, start mysql command: sudo service mysql start (

  2022-06-01 09:14:16 Views: 207
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  Common statements of Oracle SQL injection

  Parse IPselect utl_inaddr.get_host_address ('google.com') from dual; to get native IP address select utl_inaddr.get_host_ad

  2022-06-01 09:14:16 Views: 272
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  Galera cluster-build (2 data nodes + 1 arbitration)

  Installation preparation package: mariadb-galera-10.0.15-linux-x86_64.tar.gz test environment ip hostname remarks 192.168.1.111 test1 node 1192.168.

  2022-06-01 09:13:55 Views: 207
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  Navicat usage tutorial: optimizing query performance using Navicat Query Analyzer (part 1)

  Download the latest version of Navicat Monitor Navicat Monitor is a secure, simple and agentless remote server monitoring tool. It has a powerful function to maximize the effectiveness of your monitoring. Monitored servers include MySQL and Mar

  2022-06-01 09:13:55 Views: 294
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  OpenStack basic environment [1]

  OpenStack basic environment [1] OpenStack basic environment [1] openstack time: November 22, 2016 openstack introduces that openstack is a project managed by a cloud platform, it is not a software. That is,

  2022-06-01 09:13:53 Views: 270
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  [Oracle Database] data Migration (expdp/impdp)

  Export SCHEMA [oracle@king01 ~] $sqlplus / as sysdbaSQL > col owner format a10SQL > col object_name format a

  2022-06-01 09:13:53 Views: 277
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  Mongodb updates update

  1.$inc usage: {$inc: {field:value}} function: add value > db.test1.update ({'name':'wang'}, {$inc: {age:1) to a field in a numeric field

  2022-06-01 09:13:43 Views: 209
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  Installation and configuration of SonarQube Code quality Management platform

  1. Introduction of SonarQube SonarQube is an open platform for managing code quality. Code quality can be detected from seven dimensions (why use SonarQube): (1) complexity distribution (complexity):: code is too complex and too high

  2022-06-01 09:13:43 Views: 285