Java实现impala操作kudu

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Java实现impala操作kudu

实战kudu集成impala

对于impala而言，开发人员是可以通过JDBC连接impala的，有了JDBC，开发人员可以通过impala来间接操作 kudu；

引入maven相关依赖

<!--impala的jdbc操作-->

<dependency>

    <groupId>com.cloudera</groupId>

    <artifactId>ImpalaJDBC41</artifactId>

    <version>2.5.42</version>

</dependency>

通过JDBC连接impala操作kudu

使用JDBC连接impala操作kudu，与JDBC连接mysql做更重增删改查基本一样，创建实体类代码如下：

package cn.itcast.impala.impala;

public class Person {

private int companyId;

private int workId;

private String name;

private String gender;

private String photo;

public Person(int companyId, int workId, String name, String gender, String photo) {

this.companyId = companyId;

this.workId = workId;

this.name = name;

this.gender = gender;

this.photo = photo;

}

public int getCompanyId() {

return companyId;

}

public void setCompanyId(int companyId) {

this.companyId = companyId;

}

public int getWorkId() {

return workId;

}


public void setWorkId(int workId) {

this.workId = workId;

}
public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getGender() {

return gender;

}

public void setGender(String gender) {

this.gender = gender;

}

public String getPhoto() {

return photo;

}

public void setPhoto(String photo) {

this.photo = photo;

}
}

JDBC连接impala对kudu进行增删改查

package cn.itcast.impala.impala;

import java.sql.*;

public class Contants {

private static String JDBC_DRIVER="com.cloudera.impala.jdbc41.Driver";

private static String CONNECTION_URL="jdbc:impala://node1:21050/default;auth=noSasl";

//定义数据库连接

static Connection conn=null;

//定义PreparedStatement对象

static PreparedStatement ps=null;

//定义查询的结果集

static ResultSet rs= null;

//数据库连接

public static Connection getConn(){

try {

Class.forName(JDBC_DRIVER);

conn=DriverManager.getConnection(CONNECTION_URL);

} catch (Exception e) {

e.printStackTrace();

}

return conn;

}


//创建一个表

public static void createTable(){

conn=getConn();

String sql="CREATE TABLE impala_kudu_test" +

"(" +

"companyId BIGINT," +

"workId BIGINT," +

"name STRING," +

"gender STRING," +

"photo STRING," +

"PRIMARY KEY(companyId)" +

")" +

"PARTITION BY HASH PARTITIONS 16 " +

"STORED AS KUDU " +

"TBLPROPERTIES (" +

"'kudu.master_addresses' = 'node1:7051,node2:7051,node3:7051'," +

"'kudu.table_name' = 'impala_kudu_test'" +

");";


try {

ps = conn.prepareStatement(sql);

ps.execute();

} catch (SQLException e) {

e.printStackTrace();

}

}

//查询数据

public static ResultSet queryRows(){

try {

//定义执行的sql语句

String sql="select * from impala_kudu_test";

ps = getConn().prepareStatement(sql);

rs= ps.executeQuery();

} catch (SQLException e) {

e.printStackTrace();

}


return rs;

}

//打印结果

public static void printRows(ResultSet rs){

/**

private int companyId;

private int workId;

private String name;

private String gender;

private String photo;

*/

try {

while (rs.next()){

//获取表的每一行字段信息

int companyId = rs.getInt("companyId");

int workId = rs.getInt("workId");

String name = rs.getString("name");

String gender = rs.getString("gender");

String photo = rs.getString("photo");

System.out.print("companyId:"+companyId+" ");

System.out.print("workId:"+workId+" ");

System.out.print("name:"+name+" ");

System.out.print("gender:"+gender+" ");

System.out.println("photo:"+photo);


}

} catch (SQLException e) {

e.printStackTrace();

}finally {

if(ps!=null){

try {

ps.close();

} catch (SQLException e) {

e.printStackTrace();

}

}
 

if(conn !=null){

try {

conn.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

}

//插入数据

public static void insertRows(Person person){

conn=getConn();

String sql="insert into table impala_kudu_test(companyId,workId,name,gender,photo) values(?,?,?,?,?)";

try {

ps=conn.prepareStatement(sql);

//给占位符？赋值

ps.setInt(1,person.getCompanyId());

ps.setInt(2,person.getWorkId());

ps.setString(3,person.getName());

ps.setString(4,person.getGender());

ps.setString(5,person.getPhoto());

ps.execute();
  

} catch (SQLException e) {

e.printStackTrace();

}finally {

if(ps !=null){

try {

//关闭

ps.close();

} catch (SQLException e) {

e.printStackTrace();

}

}


if(conn !=null){

try {

//关闭

conn.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

}

//更新数据

public static void updateRows(Person person){

//定义执行的sql语句

String sql="update impala_kudu_test set workId="+person.getWorkId()+

",name='"+person.getName()+"' ,"+"gender='"+person.getGender()+"' ,"+

"photo='"+person.getPhoto()+"' where companyId="+person.getCompanyId();

try {

ps= getConn().prepareStatement(sql);

ps.execute();

} catch (SQLException e) {

e.printStackTrace();

}finally {

if(ps !=null){

try {

//关闭

ps.close();

} catch (SQLException e) {

e.printStackTrace();

}

}


if(conn !=null){

try {

//关闭

conn.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

}


//删除数据

public static void deleteRows(int companyId){


//定义sql语句

String sql="delete from impala_kudu_test where companyId="+companyId;

try {

ps =getConn().prepareStatement(sql);

ps.execute();

} catch (SQLException e) {

e.printStackTrace();

}

}


//删除表

public static void dropTable() {

String sql="drop table if exists impala_kudu_test";

try {

ps =getConn().prepareStatement(sql);

ps.execute();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

代码测试运行

package cn.itcast.impala.impala;

import java.sql.Connection;

public class ImpalaJdbcClient {

public static void main(String[] args) {

Connection conn = Contants.getConn();


//创建一个表

Contants.createTable();


//插入数据

Contants.insertRows(new Person(1,100,"lisi","male","lisi-photo"));
   

//查询表的数据

ResultSet rs = Contants.queryRows();

Contants.printRows(rs);


//更新数据

Contants.updateRows(new Person(1,200,"zhangsan","male","zhangsan-photo"));

//删除数据

Contants.deleteRows(1);

//删除表

Contants.dropTable();

}
}