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 ...
I am pure front-end, and I have never touched the back-end . I have seen node.js tutorials in rookie tutorials. I have done step by step, but the examples can not be applied to practical projects. what else should I do? how to learn systematically? ...
for example, write a pop-up plug-in. After I send this package to npm, how can I get someone else to import my package and introduce my plug-in? what should I do? ...
the time of playing other flv files will show the time, but the flv recorded by nginx-rtmp will not show the time, and the time will show 00 flv 00. What s going on? please advise ...
as shown in the title, as shown in the figure, Baidu Maps and echarts, often appear when refreshing the page in the vue development environment: Wating for static.tieba.baidu.com. seems to be requesting this address, but echarts should not request th...
as the title give an example http: localhost:8081 admin login?ref=http: localhost:8081 admin article list?page=2&size=2 to be exact, the address has only one parameter, and the value of ref is a url, so the question arises: does & size=2 belong ...