4°、初始化hive元数据仓库
前提:将Mysql驱动包拷贝到lib目录下 (hive客户端会同时连接mysql数据库和HDFS)
xx]# schematool -initSchema -dbType mysql -userName root -passWord root
可以简写为:schematool -initSchema -dbType mysql
5°、启动hive
hive
如何验证安装成功?
[root@LENOVO01 hive]# schematool -initSchema -dbType mysql
which: no hbase in (/root/soft/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/opt/jdk/bin:/opt/hadoop/bin:/opt/hadoop/sbin:/opt/zookeeper/bin:/usr/local/software/jdk/bin:/root/bin:/opt/jdk/bin:/opt/hadoop/bin:/opt/hadoop/sbin:/opt/zookeeper/bin:/opt/hive/bin)
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/hive/lib/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/hadoop/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
Metastore connection URL: jdbc:mysql://LENOVO01:3306/hivecreateDatabaseIfNotExist=true&useUnicode=true&characterEncoding=UTF-8
Metastore Connection Driver : com.mysql.jdbc.Driver
Metastore connection User: root
Starting metastore schema initialization to 2.1.0
Initialization script hive-schema-2.1.0.mysql.sql
Initialization script completed
schemaTool completed
hive>
主题:Hive的操作:
Hive的表的操作:
hive中没有主键,没有外键的定义,但是我们可以参照mysql表的定义来进行说明
create table t (
line string
);
加载数据(linux本地相应目录中的数据):
//load data local inpath '' into table mydb1.t;
load data local inpath '/opt/data/hive/hive-t.txt' into table mydb1.t;
set hive.cli.print.header=true;显示表头信息 注意:
关于中文乱码的解决:
3、进入数据库 Metastore 中执行以下 5 条 SQL 语句
-- ①修改表字段注解和表注解
alter table COLUMNS_V2 modify column COMMENT varchar(256) character set utf8;
alter table TABLE_PARAMS modify column PARAM_VALUE varchar(4000) character set utf8;
-- ② 修改分区字段注解:
alter table PARTITION_PARAMS modify column PARAM_VALUE varchar(4000) character set utf8 ;
alter table PARTITION_KEYS modify column PKEY_COMMENT varchar(4000) character set utf8;
-- ③修改索引注解:
alter table INDEX_PARAMS modify column PARAM_VALUE varchar(4000) character set utf8;