convert json to mysql table

specify aMySQLThe shunt strategy of the cluster,Strategy"master-only"indicates that only use theMaster,to be"Read-failover"representsMasterWhen not available, it will be read and cut to standby,Strategy"Read-slave"indicates read-onlySlave,Strategy"read-balance"indicates that all nodes are read,can be used multiple times for differentMySQLMaster and Standby sets different policies. proxy-group-security,used to specify aMySQLsecurity policies for clusters, Strategy0for Unrestricted,Strategy1disab

| AFTER col_name ] | ADD [COLUMN] (column_definition,...) | ADD INDEX [index_name] [index_type] (index_col_name,...) | ADD [CONSTRAINT [symbol]] PRIMARY KEY [index_type] (index_col_name,...) | ADD [CONSTRAINT [symbol]] UNIQUE [index_name] [index_type] (index_col_name,...) | ADD [FULLTEXT|SPATIAL] [index_name] (index_col_name,...) | ADD [CONSTRAINT [symbol]] FOREIGN KEY [index_name] (index_col_name,...) [reference_definition] | ALTER [COLUMN] col_name

MySQL-optimized MRR (Multi-Range Read: secondary index merged back to table), mrrmulti-range MRR is introduced in MySQL5.6 for optimization:List index range scan and need to return to the table. The principle is to sort multiple secondary indexes that need to be returned to the table based on the primary key, and then

Solve the Problem of garbled characters in mysql table Character Set gbk, column Character Set Latin1, and python query, mysqllatin1 Recently, I encountered an abnormal problem in the company. In mysql databases, the character sets of databases and tables are both 'gbk', but the column character sets are 'latin1. No matter whether the 'charset' of the connection

Label:The MySQL database is an open-source database that is widely used. The following is a procedure for modifying the character encoding of a MySQL database and converting the character encoding of a table into a Utf-8 method, which a friend can refer to. MySQL converts the character encoding of a

not affect each other, but the update operation in actual session 1 blocks the update operation in session 2The update operation was performed in Session 1, but the transaction commit was not performed, and the isolation level of the transaction was read Committed, so in session 2 it was not seen to be the result of the update in conversation 1. However, when you perform an update operation on other rows in reply 2, a blocking occurs. It can be seen that the assignment of SQL statements in Sess

MySQL Data Table field content update commands, such as batch modification, clearing, copying, and so on. For more information, see. MySQL Data Table field content update commands, such as batch modification, clearing, copying, and so on. For more information, see. Recently, some troubles have occurred. The newly inst

I've had a bit of trouble lately. Newly installed PHPwind6.0 official version of the community before the introduction of the member account data, found that many members of the mail address seemingly random fill in, before the PHPwind5.5 version did not open the mail address verification function, so the estimated number of users randomly fill out the email address, so I would like to ask all the official members to retest e-mail address to reactivate the member account, the results found that

Next to the previous articleMySQL database performance optimization-Cache Parameter Optimization, This isMySQL database performance optimization topicsThe second article in the series: Table Structure of MySQL database performance optimization ManyDatabase design paradigmAs a database table structure design "Bible", the author believes that as long as the design

No details: MySQLaltertabletb_anniversaryconverttocharactersetutf8; No details about MySQL alter table tb_anniversary convert to character set utf8; MySQL --> $velocityCount--> --> alter table tb_anniversary convert

There are many ways to use php to export a mysql database as an excel table. The simplest way is to directly use the phpfputcsv function. you can also directly input the csv format, to generate a standard excel format, we need a third-party plug-in. side... there are many ways to use php to export a mysql database as an excel

Tags: str rac BSP View CLI show car highlight MySQL Modify View individual encodingsView field codes show full COLUMNS from Park_car_user;View database FieldsSHOW CREATE DATABASE db_name;To view the encoding of a tableSHOW CREATE TABLE tbl_name; Modify Database Encoding [Client] default-character-set= GBK Port=3306 [Server] default-character-set= GBK Port=3306 [

In Linux, the database name, table name, column name, And alias are case-sensitive: 1. The database name and table name are case sensitive; 2. Table aliases are case sensitive; 3. The column name and column alias are case-insensitive in all cases; 4. Variable names are case sensitive; MySQL is case insensitive in

During the development process, for historical reasons or performance reasons, you need to convert the table column data to row data, or row data to column data use, this article will introduce the MySQL table data column conversion method, provide a complete demonstration examples and SQL skills. 1. Row to Column Cre

warnings:0Mysql> Show CREATE TABLE T1\g1. Row ***************************Table:t1Create table:create Table ' T1 ' (' id ' int (one) not NULL auto_increment,' Account ' varchar (+) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin not NULL DEFAULT ' ',PRIMARY KEY (' id '),UNIQUE KEY ' uniq_account ' (' account ')) Engine=innodb auto_increment=4 DEFAULT charset=utf8mb41 row in Set (0.00 sec)3. Adjust the default cha

MySQL study note _ 2_MySQL create a data table (on) and study note _ 2_mysqlCreate a data table (on) in MySQL) I. Create an SQL statement model for a data table [weak type] CREATETABLE [if not exists] Table Name ( Type of field n

MySQL study note _ 2_MySQL create a data table (on)Create a data table (on) in MySQL) I. Create an SQL statement model for a data table [weak type] CREATETABLE [if not exists] Table Name ( Type of field name 1 column [attribute]

It is unknown that the database design 3 paradigm, which was regarded as the "Bible" N years ago, has not been fully applied. Here I have sorted out some common optimization techniques for database table structure design, hoping to be useful to you. Because MySQL databases are Row-based databases, and database IO operations are performed in the form of page (block), that is, if the space occupied by each re

Because the memory engine does not support Bolb and text types, if the query uses a BLOB or text column and you need to use an implicit temporary table, you will have to use the MyISAM disk staging table, even if there are only a few rows of data.This can result in a serious performance overhead. Even if you configure MySQL to store temporary tables on memory blo

Using PHP to export MySQL database for Excel table Many ways, the simplest directly using the PHP fputcsv function, there is a direct input CSV format is also possible, to generate Excel standard format we need to use a third-party plug-in Method one, using Fputcsv The code is as follows Copy Code Output Excel file header, you can replace user.csv with the file name you wantHeader