Programmer Think

The Spark mentioned here includes SparkCore/SparkSQL/SparkStreaming. In fact, all operations are the same. The following shows the code in the actual project. Method 1: write the entire DataFrame to MySQL at one time (the Schema of DataFrame should be consistent with the domain name defined in the MySQL table) Dat ...

The auto configuration provided by Spring Boot is very powerful. In some cases, the auto configuration function may not meet our requirements. We need to customize the configuration. At this time, we need to exclude / disable the auto configuration of some classes of Spring Boot. For example, data source and mail are all provided with automatic ...

1. Problem description Use Impala JDBC to insert Chinese characters into Kudu table. The inserted Chinese characters are garbled and the Chinese characters are truncated. After the previous document uses sql splicing method to insert Chinese string scrambling solution, this document describes the problem of using jdbc PreparedStatement method t ...

I. send message to queue (producer) Create a new maven project and add the following dependencies to the pom.xml file <dependencies> <dependency> <groupId>com.rabbitmq</groupId> <artifactId>amqp-client</artifactId> <version>3.6.5</version> </dependency> </ ...

I. configuration file structure First of all, the structure of the configuration file is as follows Here are a few key configurations 1. jdbc.properties #============================================================================ # datasource 1 #============================================================================ #Da ...

    1. It is introduced in pom.xml. Since the ojdbc6.jar package cannot be imported directly in the POM file, Download ojdbc6.jar and import it manually in WEB-INF/lib under the overlays directory   <dependency> <groupId>org.jasig.cas</groupId> <artifactId>cas-server-support-jdbc</artifact ...

Add dependency <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.0</version> </dependency> Configure connection pool # JDBC configuration spring.datasource.type=com.al ...

There are many demand scenarios for multiple data sources, while springboot only provides a single data source configuration, so when we need to configure multiple data sources, we need to do it by ourselves. The configuration of multiple data sources described in this article distinguishes different data sources by subcontracting, that is, co ...

1. Write a circular program to read the latest row of data in the database every few seconds The method of connecting access database and the information of query. Then open a timing to remove.   package javacommon.util; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql. ...

Dynamic switching of data sources on the Internet can not meet my current application, and switching back and forth will cause performance problems and crash. And it's not a good way to switch notes on a certain method. So think about it at the top level. Here is my configuration: Initializing multiple spring-mybatis.xml files i ...