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Solutions: 1. The code reports an error. The operation causing the exception is batch update. The definition of the Bean is related to Druid as follows: <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="driverClassName" value="${db.driverClassName}"/&g ...

Simple timing task solution: when using redis's keyspace notifications, you need to note that this function is launched after redis version 2.8, so the reids on your server should be at least 2.8 or above; (A) business scenario: 1. When a business is triggered, a scheduled task needs to be started, and another task needs to be executed within t ...

Catalog Introduction to MyBatis interceptor Use of interceptors Introduction and configuration of interceptor Source code analysis summary Reprinted from Research on the principle of MyBatis interceptor Introduction to MyBatis interceptor MyBatis provides a plug-in function. Alt ...

If you use mysqli's query method to get the result, you will get an error: Commands out of sync; you can't run this command now sss Stored procedure: CREATE PROCEDURE test1() begin drop table if exists tb1; create table tb1 ( val int not null )engine = innoDB; insert into tb1(val) values(1),(2),(3) ...

This is the ninth article of Effective Java. To illustrate the problem, I write an ugly code first: private void doSomething(Connection connection) { String sql = "select 1"; PreparedStatement preparedStatement = null; try { preparedStatement = connection.prepareStatement(sql); p ...

Business logic processing Peers To judge whether it is a peer object, we can judge whether two objects have passed through multiple identical places by using longitude and latitude. Of course, each monitoring device can also be marked. When an object passes through the monitoring device, it can be captured by the device. Tra ...

To read this article, you must know the basic docker. This article only provides ideas and part of the code, not responsible for teaching All orders must be handled carefully! look before you leap command Stop all running containers docker stop $(docker ps -a -q) Delete all containers docker rm $(docker ps -a -q) Using docker compose to start t ...

statement My sample environment: System version: CentOS 7.1 Database version: SQL Server2012 python version: Python 3.6.3 Connect to database tools: pyodbc, freetds If you use Django to connect to the SQL Server database, please refer to the blog "Django 2.1 connect to use SQL Server(linux version)", which is different from that, ...

Software type: CS Development tool: Delphi Function: restrict multiple logins of the same account and choose to kick others forcibly. 1. Use the temporary table to determine whether the current account has been logged in. Here is a brief introduction to the temporary table method. When the software is successfully logged in for the first time, ...

concept Nonpartitioned tables can be converted to partitioned tables online. Indexes are maintained as part of this operation and can be partitioned as well. The conversion has no impact on the ongoing DML operations. You can convert non partitioned tables to online partitioned tables. Indexes are maintained as part of the op ...