这里简要介绍一下PG中的Copy以及\Copy快速加载数据的基本用法及注意事项。同时也比较了Batch Insert与Copy之间的性能差异。它们在PG日常维护与使用的场景中经常要用到。

1.Copy语法

PG 9.0以后的新语法如下：

COPY table_name [ ( column_name [, ...] ) ]   FROM { 'filename' | PROGRAM 'command' | STDIN }   [ [ WITH ] ( option [, ...] ) ]   [ WHERE condition ]
​
COPY { table_name [ ( column_name [, ...] ) ] | ( query ) }   TO { 'filename' | PROGRAM 'command' | STDOUT }   [ [ WITH ] ( option [, ...] ) ]
​
where option can be one of:
​   FORMAT format_name   FREEZE [ boolean ]   DELIMITER 'delimiter_character'   NULL 'null_string'   HEADER [ boolean ]   QUOTE 'quote_character'   ESCAPE 'escape_character'   FORCE_QUOTE { ( column_name [, ...] ) | * }   FORCE_NOT_NULL ( column_name [, ...] )   FORCE_NULL ( column_name