jenkins(docker)安装及应用

一、依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>hivejdbc</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.apache.hive</groupId>
            <artifactId>hive-jdbc</artifactId>
            <version>2.1.1</version>
            <exclusions>
                <exclusion>
                    <groupId>org.eclipse.jetty</groupId>
                    <artifactId>jetty-runner</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.hive/hive-exec -->
        <dependency>
            <groupId>org.apache.hive</groupId>
            <artifactId>hive-exec</artifactId>
            <version>3.0.0</version>
        </dependency>



    </dependencies>

</project>

二、定义类，继承GenericUDF

package cn.edu.tju;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;

public class StringLengthUdf extends GenericUDF {
    @Override
    public ObjectInspector initialize(ObjectInspector[] objectInspectors) throws UDFArgumentException {
        return PrimitiveObjectInspectorFactory.javaIntObjectInspector;
    }

    @Override
    public Object evaluate(DeferredObject[] deferredObjects) throws HiveException {
        String str = deferredObjects[0].get().toString();
        if(str == null){
            throw new RuntimeException("空字符串!");
        }
        return str.length();
    }

    @Override
    public String getDisplayString(String[] strings) {
        return "";
    }
}

三、打包jar包
四、上传到hive的服务器
五、通过hive的add jar 添加到hive环境

add jar /root/demo.jar

六、基于jar包创建自定义函数,引号中的是自定义函数类的全路径

create function stringLength as "cn.edu.tju.StringLengthUdf";

七、使用自定义函数：

select stringLength('what is your name?');