|NO.Z.00004|——————————|BigDataEnd|——|Hadoop&OLAP_Kudu.V04|——|kudu.v04|常用API|创建删除表|

一、KuDu常用Api(java)：创建maven工程：kudu_project

### --- 在pom.xml下添加依赖

    <dependencies>

    <dependency>
        <groupId>org.apache.kudu</groupId>
        <artifactId>kudu-client</artifactId>
        <version>1.4.0</version>
    </dependency>

    </dependencies>

二、KuDuApi常用操作：创建表

### --- 创建表

~~~     # 思路：kudu建表几个必须：
~~~     必须指定表连接到的master节点主机名
~~~     必须定义schema
~~~     必须指定副本数量、分区策略和数量

### --- 编程代码实现
### --- 编译打印：通过Chrome访问http://hadoop01:8051/tables查看创建的表

package com.yanqi.kudu.api;

import org.apache.kudu.ColumnSchema;
import org.apache.kudu.Schema;
import org.apache.kudu.Type;
import org.apache.kudu.client.CreateTableOptions;
import org.apache.kudu.client.KuduClient;
import org.apache.kudu.client.KuduException;

import java.util.ArrayList;

public class createTableDemo {
    /**
     * （1）必须指定表连接到的master节点主机名
     *
     * （2）必须定义schema,声明的每一个字段必须显式的说明是否是主键
     *
     * （3）必须指定副本数量、分区策略和数量
     */
    public static void main(String[] args) {
        //client
        String masterAddresses = "hadoop01";
        KuduClient.KuduClientBuilder kuduClientBuilder = new KuduClient.KuduClientBuilder(masterAddresses);
        KuduClient client = kuduClientBuilder.build();

        String tableName = "student";
        //id int pkey    name string

        //指定每一列的信息
        ArrayList<ColumnSchema> columnSchemas = new ArrayList<ColumnSchema>();
        ColumnSchema id = new ColumnSchema.ColumnSchemaBuilder("id", Type.INT32).key(true).build();
        ColumnSchema name = new ColumnSchema.ColumnSchemaBuilder("name", Type.STRING).key(false).build();
        columnSchemas.add(id);
        columnSchemas.add(name);
        Schema schema = new Schema(columnSchemas);

        CreateTableOptions options = new CreateTableOptions();
        //设定当前的副本数量为1
        options.setNumReplicas(1);
        ArrayList<String> colrule = new ArrayList<String>();
        colrule.add("id");
        options.addHashPartitions(colrule,3);


        try {
            client.createTable(tableName,schema,options);
        } catch (KuduException e) {
            e.printStackTrace();
        } finally {
            try {
                client.close();
            } catch (KuduException e) {
                e.printStackTrace();
            }
        }
    }

}

三、KuDuApi常用操作：删除表

### --- 编程代码实现：删除表：client.deleteTable
### --- 编译打印

package com.yanqi.kudu.api;

import org.apache.kudu.client.KuduClient;
import org.apache.kudu.client.KuduException;

public class deleteTableDemo {
    public static void main(String[] args) {
        KuduClient client = new KuduClient.KuduClientBuilder("hadoop01").build();
        try {
            client.deleteTable("student");
        } catch (KuduException e) {
            e.printStackTrace();
        }finally {
            try {
                client.close();
            } catch (KuduException e) {
                e.printStackTrace();
            }
        }
    }
}

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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