可以使用以下代码示例来实现:
CREATE PROCEDURE copy_data_with_columns (IN source_table VARCHAR(255), IN destination_table VARCHAR(255), IN file_format VARCHAR(255), IN external_location VARCHAR(255)) BEGIN DECLARE copy_query VARCHAR(max); SET copy_query = CONCAT('CREATE TABLE ', destination_table, ' LIKE ', source_table, '; '); SET copy_query = CONCAT(copy_query, 'LOAD DATA INPATH "', external_location, '" INTO TABLE ', destination_table); SET copy_query = CONCAT(copy_query, ' ', file_format, ' ('); SELECT GROUP_CONCAT(COLUMN_NAME) INTO @columns FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = source_table; SET copy_query = CONCAT(copy_query, @columns, ')'); PREPARE stmt FROM copy_query; EXECUTE stmt; DEALLOCATE PREPARE stmt; END;
此存储过程将从指定的外部位置中复制指定源表的数据,并按照指定的文件格式和列名插入到指定的目标表中。
例如,要将名为“source_table”的表从HDFS路径“/user/hive/data/”中的数据复制到名为“destination_table”的 Hive 返回该数据表。
CALL copy_data_with_columns('source_table', 'destination_table', 'ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n''', '/user/hive/data/');