programming hive

"Programming Hive" Reading notes (two) Hive basics: first read is browse. Build knowledge index, because some knowledge may not be able to use, know is good. The parts of interest can be studied more. After the use of the time to look specifically. and combined with other materials.Chapter 3.Data Types and File FormatsRaw data types and collection data typesSelec

database name and directory location:Hive> alter database privileges ALS set dbproperties ('created by '= 'Aaron ')Create a table:The create table statement follows the SQL syntax convention. For example:Create table if not exists financial. employee (name string, age tinyint, salary float, subordinates array Display tables in the database:Hive> use financial; hive> show tables; employeeEven if it is not in a financial database, you c

Hive programming guide-employees table data definition and programming guide-employees There is an employees table in the hive programming guide. The default Delimiter is complicated and cannot be edited easily (the control character ^ A edited by the General Editor is trea

set the port for Hiveserver: $>./hiveserver2--hiveconf hive.server2.thrift.port=4444 To start the Beeline client: $>./beeline-u jdbc:hive2://hadoop003:4444/default-n Hadoop Hive JDBC Programming Note the point:JDBC is the way clients are accessed, so you need to start a server that is HiveServer2 To build a project using MAVEN, the Pom.xml file looks like this: Program: Package com.zhaotao.bigdata.

= "describe" + tableName;res = stmt.executequery (SQL);System.out.println (res.getstring (1) + "\ T" + res.getstring (2));}Perform the "Load data into table" operationString filepath = "/home/hadoop/djt.txt"; the local file path of the node where the//hive service residessql = "Load data local inpath '" + filepath + "' into table" + tableName;Stmt.execute (SQL);Perform a "select * query" operationsql = "SELECT * from" + tableName;res = stmt.executequ

The fourth chapter: HQL data definition1: Create a databaseCreate DATABASE Financials;Create database if not exists financials;2: View Databaseshow databases;Fuzzy Query DatabaseShow databases like ' h.* ';3: Create database to modify the default location of the databaseCreate DATABASE Financials localtion '/my/preferred/directory '4: Add descriptive information to the databaseCreate DATABASE Financials Comment ' holds all financials tables '5: Information that shows the description of the datab

Set Hive.metastore.warehouse.dir=/user/myname/hive/warehouse;Users to set their own data Warehouse directory. Does not affect other users. Also set in $home/.hiverc, the hive automatically loads each time it startsHive-(D,EF,H,H,I,P,S,V)Define variable var, directly referencing ${var} in HQLSet (show or modify)Set (See all variables)Set Env:home;Set-v;Print namespaces without-VHive--define Foo=bar (-D short

There is a employees table in the Hive Programming Guide, the default delimiter is cumbersome, the editing is not very convenient (the general editor of the control character ^a, etc. is treated as a string, does not play the role of delimiters). The following solutions are collected:Http://www.myexception.cn/software-architecture-design/1351552.htmlhttp://blog.csdn.net/lichangzai/article/details/18703971Re

Hive supports the basic data types supported by many relational databases and supports three collection data types with few relational databases. A related question is how these data types are presented in a text file, or how to describe the storage of text. Compared to most databases, Hive has a feature that provides a great deal of flexibility in how data is encoded in text. Most databases have full contr

[Root@master ~]# Hive Missing Hive execution Jar:/root/hive/hive/lib/hive-exec-*.jar Display missing hive execution Jar when running hive:/usr/h