Preface
JSON can convert a set of data represented in a JavaScript object into a string, and then this character can be easily passed between functions string, or pass a string from a Web client to a server-side program in an asynchronous application. This string can represent arrays and complex objects, not just simple lists of keys and values. Storing Json strings in Mysql can greatly simplify the storage complexity, and at the same time, reading the database becomes solves the first problem that many people encounter.
Example: { "key": "value" }
1. What is Json?
A lightweight data exchange format is JSON (JavaScript Object Notation). JSON uses a completely language-independent text format. These characteristics make JSON an ideal data exchange language. Easy for humans to read and write, and easy for machines to parse and generate.
2. Different situations
1. Fuzzy query json type field
The stored data format (field name people_json):
{“name”: “zhangsan”, “age”: “13”, “gender”: “男”}
The code is as follows (example ):
select * from table_name where people_json->'$.name' like '%zhang%'
2. Accurately query the data format stored in the json type field
(field name people_json):
{“name”: “zhangsan”, “age”: “13”, “gender”: “男”}
The code is as follows (example):
select * from table_name where people_json-> '$.age' = 13
3. Fuzzy query JsonArray type field
Stored data format (field name people_json):
[{“name”: “zhangsan”, “age”: “13”, “gender”: “男”}]
The code is as follows (example):
select * from table_name where people_json->'$[*].name' like '%zhang%'
4. Precise query JsonArray Type field
Stored data format (field name people_json):
[{“name”: “zhangsan”, “age”: “13”, “gender”: “男”}]
The code is as follows (example):
select * from table_name where JSON_CONTAINS(people_json,JSON_OBJECT('age', "13"))
The above is the detailed content of Analysis of JSON string stored in Mysql. For more information, please follow other related articles on the PHP Chinese website!

TograntpermissionstonewMySQLusers,followthesesteps:1)AccessMySQLasauserwithsufficientprivileges,2)CreateanewuserwiththeCREATEUSERcommand,3)UsetheGRANTcommandtospecifypermissionslikeSELECT,INSERT,UPDATE,orALLPRIVILEGESonspecificdatabasesortables,and4)

ToaddusersinMySQLeffectivelyandsecurely,followthesesteps:1)UsetheCREATEUSERstatementtoaddanewuser,specifyingthehostandastrongpassword.2)GrantnecessaryprivilegesusingtheGRANTstatement,adheringtotheprincipleofleastprivilege.3)Implementsecuritymeasuresl

ToaddanewuserwithcomplexpermissionsinMySQL,followthesesteps:1)CreatetheuserwithCREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password';.2)Grantreadaccesstoalltablesin'mydatabase'withGRANTSELECTONmydatabase.TO'newuser'@'localhost';.3)Grantwriteaccessto'

The string data types in MySQL include CHAR, VARCHAR, BINARY, VARBINARY, BLOB, and TEXT. The collations determine the comparison and sorting of strings. 1.CHAR is suitable for fixed-length strings, VARCHAR is suitable for variable-length strings. 2.BINARY and VARBINARY are used for binary data, and BLOB and TEXT are used for large object data. 3. Sorting rules such as utf8mb4_unicode_ci ignores upper and lower case and is suitable for user names; utf8mb4_bin is case sensitive and is suitable for fields that require precise comparison.

The best MySQLVARCHAR column length selection should be based on data analysis, consider future growth, evaluate performance impacts, and character set requirements. 1) Analyze the data to determine typical lengths; 2) Reserve future expansion space; 3) Pay attention to the impact of large lengths on performance; 4) Consider the impact of character sets on storage. Through these steps, the efficiency and scalability of the database can be optimized.

MySQLBLOBshavelimits:TINYBLOB(255bytes),BLOB(65,535bytes),MEDIUMBLOB(16,777,215bytes),andLONGBLOB(4,294,967,295bytes).TouseBLOBseffectively:1)ConsiderperformanceimpactsandstorelargeBLOBsexternally;2)Managebackupsandreplicationcarefully;3)Usepathsinst

The best tools and technologies for automating the creation of users in MySQL include: 1. MySQLWorkbench, suitable for small to medium-sized environments, easy to use but high resource consumption; 2. Ansible, suitable for multi-server environments, simple but steep learning curve; 3. Custom Python scripts, flexible but need to ensure script security; 4. Puppet and Chef, suitable for large-scale environments, complex but scalable. Scale, learning curve and integration needs should be considered when choosing.

Yes,youcansearchinsideaBLOBinMySQLusingspecifictechniques.1)ConverttheBLOBtoaUTF-8stringwithCONVERTfunctionandsearchusingLIKE.2)ForcompressedBLOBs,useUNCOMPRESSbeforeconversion.3)Considerperformanceimpactsanddataencoding.4)Forcomplexdata,externalproc


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

Atom editor mac version download
The most popular open source editor

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

SublimeText3 Chinese version
Chinese version, very easy to use

SublimeText3 Linux new version
SublimeText3 Linux latest version
