# 查看命令帮助

[hadoop@hadoop ~]$ sqoop help

20/06/06 18:07:14 INFO sqoop.Sqoop: Running Sqoop version: 1.4.6-cdh5.16.2

usage: sqoop COMMAND [ARGS]

Available commands:

  codegen            Generate code to interact with database records

  create-hive-table  Import a table definition into Hive

  eval              Evaluate a SQL statement and display the results

  export            Export an HDFS directory to a database table

  help              List available commands

  import            Import a table from a database to HDFS

  import-all-tables  Import tables from a database to HDFS

  import-mainframe  Import datasets from a mainframe server to HDFS

  job                Work with saved jobs

  list-databases    List available databases on a server

  list-tables        List available tables in a database

  merge              Merge results of incremental imports

  metastore          Run a standalone Sqoop metastore

  version            Display version information

See 'sqoop help COMMAND' for information on a specific command.

# 查看命令的参数

[hadoop@hadoop ~]$ sqoop help list-databases

#使用sqoop获取数据库的列表

[hadoop@hadoop ~]$ sqoop list-databases \

> --connect jdbc:mysql://192.168.228.128:3306 \

> --username root \

> --password root

20/06/06 18:51:16 INFO sqoop.Sqoop: Running Sqoop version: 1.4.6-cdh5.16.2

20/06/06 18:51:16 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.

20/06/06 18:51:16 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.

Sat Jun 06 18:51:17 CST 2020 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.

information_schema

mysql

performance_schema

sys

# 使用sqoop导数据到hadoop

[hadoop@hadoop ~]$ sqoop import \

> --connect jdbc:mysql://192.168.228.128:3306/ruozedata \

> --username root \

> --password root \

> --table sqoop_test

出现如下错误，很明显，就是缺少jar包，参考https://community.cloudera.com/t5/Support-Questions/Sqoop-import-exception-java-lang-NoClassDefFoundError-org/td-p/50758，下载到对应的jar包放入$SQOOP_HOME/lib下即可