The error is shown in the figure:
The reason for the error is:Because of net start + service name, the service registered under win is started . At this time, mysql is not registered to the s
Category: Mysql
MySQL is a relational database management system, developed by the Swedish company MySQL AB, and currently belongs to an Oracle company. MySQL is the most popular relational database management system. In terms of web applications, MySQL is one of the best RDBMS (Relational Database Management System) application software.
129 mysql data type (important)
Contents
mysql The database supports the following data types:
Key points:tinyint, int, constraints (unsigned, zerofill)
tinyint: 1 byte -128~127 (for logical judgment) Key points
131 mysql single table inquiry (important)
Table of Contents
SELECT DISTINCT field 1, field 2… FROM table name WHERE condition GROUP BY field HAVING filter ORDER BY field LIMIT limit the number of entries 1.2 keyword execution prior
MySQL Working With Dates
The most difficult part when working with dates is to be sure that the format of the date you are trying to insert, matches the format of the date column in the database. As long as your data contains only the date portion, your queries will work as expected. However, if a time portion is […]
MySql AUTO INCREMENT Field
If you accidentally lose the primary key and need to modify the id column of the table as the primary key, you can use the following SQL statement
Mysql delete duplicate records and only keep one row
Recently, I have been working for a subject storehouse system. Since duplicate subject are added to the storehouse, it is necessary to query the duplicate subject, and delete all duplicate subject leave only one, so that the duplicate subject cannot be taken when the test is taken. First wrote a small example: Single field operation […]
Mysql deadlock, waiting for resources, transaction lock, lock wait timeout exceeded; try restarting transaction
Mysql deadlock, waiting for resources, transaction lock, lock wait timeout exceeded; try restarting transaction I have already learned about InnoDB. When the lock wait occurs, it will judge whether the timeout operation is needed according to the configuration of the parameter innodb_lock_wait_timeout. This document describes the viewing and analysis processing when the lock wait occurs. […]
Mybatis annotation application mapping statement
MyBatis provides a variety of annotation mappings such as SELECT, UPDATE, INSERT, and DELETE. Let me take a closer look at the application of these mappings. 1.@Insert We can use the @Insert annotation to declare an INSERT mapping. Package com.owen.mybatis.mappers; Public interface StudentMapper { @Insert(“INSERT INTO STUDENTS(STUD_ID, NAME, EMAIL, ADDR_ID, PHONE) VALUES(#{studId},#{name},#{email},#{address.addrId},#{phone})”) Int insertStudent(Student student); […]