jav inserts Mysql data exception Data too long exception information 2018-04-24 00:15:01 ERROR com.comall.cybershop.common.base.DaoSupport org.springframework.dao.DataIntegrityViolationException: PreparedStatementCallback; SQL [update cs_awardCardRe...
is currently self-learning mysql,. When querying, sometimes you need to use as aliases, but after adding as aliases to the following two query statements, why is it incorrect? 1, select cat_id,goods_name,shop_price from goods where shop_price in (sele...
my need is to be able to make a list of private messages and take the last private message record. For example, the structure of the data table: id pid from_userid to_userid content time 10 a b hi 01 21 b a hello 02 3 1 a b hihi 04 40 a c test 09 5...
if you want to query the data with an index in the database, the sql statement is SELECT * FROM opot.tjopot WHERE MATCH ( ZSD1 ) AGAINST ( division and multiplication of rational numbers ) this statement can query the results in mysqlworkbench, but c...
query the COUNT of a sentence (1), JOIN IN has 4 tables. The total number of records is 3800, and it takes 43 seconds this is SQL: select count(1) from ( SELECT a.id AS "id", a.batch_id AS "batchId", a.product_type AS "product...
for stand-alone service, the primary key ID is a long integer, which needs to be non-continuous. For example, self-increment cannot be implemented because it is continuous. I thought of using System.nanoTime () to do ID, because I haven t practiced it...
tables in the database want to be assigned somewhere else ...
the database uses MySQL, to concatenate a SQL query statement, and the question mark in the statement is the parameter, but when testing the SQL statement, writing down the three parameters to update the data does not work. How should the correct SQL be...
A a_id a_title a_key a_desc a_pid 1 A A A 1 B b_id b_title b_key b_desc b_pid 1 b 2 C c_id c_title c_key c_desc c_pid 1 $title= Ctitile || ...
Table: ID name value time 1 A 3 2018-1-1 1 A 4 2018-4-4 2 B 6 2018-1-2 3 C 7 2018-1-3 3 C 9 2018-4-6 how to group by ID and only take the most recent value of time (time) under the same ID and name: such as: ID name value time 1 A 4 2018-4-...
in mysql, set a regular expression to filter strings ending in number select number from test where number REGEXP xxxxxxxxx . ...
right DELETE error ...
where = order by order asc. the tables in my database are originally arranged and read in order but the order is out of order after adding asc and do not understand what the author intends ...
An insert statement written in the JavaWeb project looks something like this customerInfo object has all the values, and none is empty. here is the add method public boolean customerInfoAdd(SendCard customerInfo){ try { sqlSes...
like Table Fields id typeid article id userid user id status like status 1: liked 0: not liked I want to know that the id of an article is the total number of likes of 1br 2 code 3 group by typeid 4. I don t know how to use tp5 to write Native ...
I want to use the example class of mybatis to generate the following sql statement: SELECT * FROM User where nick_name like "%1502%" or real_name like "%1502%" or mobile like "%1502%" this is how I used it: UserExample u...
there are three tables of A _ $a=DB::table( A )->where( some condition ); $b=DB::table( B )->where( some condition ); $c=DB::table( C )->where( some condition )->union($a)->union($b); if the result set of $an or $b is empty,...
Table T_USER T_ROLE : the following is the table creation and data script drop table if exists T_USER; CREATE TABLE T_USER( USER_ID INT, USER_NAME VARCHAR(25) ); INSERT INTO T_USER VALUES(1, USER_A ); INSERT INTO T_USER VALUES(2, USER_B )...
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ask how to write the sql statement ...
There is an input input box in the page. If the other party enters < H2 > Hello < H2 > , it will be automatically converted to large bold text. how to output strings directly from p.content without parsing H2 tags into large bold? ${value} `; th...
problem description I just started using the vue write function, and the data in loginStore is empty. I wonder if I can save the userdata in api.js into store! related codes loginStore.js import { login } from ".. Services api.js"; im...
1: I was playing Mini Program page, and then I took another encapsulated file written at the front end to send the request from the version library. After resolving the conflict, after commit, the project started to run . 2: I m on the page right n...
Why is it necessary to disconnect and reconnect the server if the nodejs code is changed? ...
1. On a certain web page, the data I want to crawl is as follows, the red framed data in the picture. I opened F12, switched to the network option, and looked at one item after another. I never saw the relevant data. I really don t understand how this ...