PostgreSQL 9.1.5ʸ��
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8.4. �Х��ʥ��ǡ��

bytea�ǡ��ϥХ��ʥ��¸��ǽ�ˤ��ޤ�� 表8-6�򻲾Ȥ��Ƥ��

表 8-6. �Х��ʥ��ǡ��

��̾	��Ǽ��	��
`bytea`	1�ޤ��4�Х��ȤȼºݤΥХ��ʥ��Ĺ��	��Ĺ�ΥХ��ʥ��

�Х��ʥ��ϥ��ƥåȡʤޤ��ϥХ��ȡˤ�Ϣ³�Ǥ�� Х��ʥ��ϣ��Ĥ��ˡ��ʸ��ȶ��̤��ޤ�� 1��ܤϡ��Х��ʥ��ϥ��ͤΥ��ƥåȤ�¾��"ɽ��Ǥ��ʤ�"��ƥåȡ��̾�32��126��ϰϳ��Υ��ƥåȡˤ��¸�Ǥ��Ȥ��ȤǤ�� ʸ��Ǥϥ��Ȥ��ƥåȤϻ��ѤǤ��ޤ�� ޤ��ǡ��١��򤷤Ƥ��ʸ��å��沽��̵��ʥ��ƥå��ͤ䥪��ƥå��ͤ��¤Ӥ��ѤǤ��ޤ�� 2��ܤϡ��Х��ʥ��黻��ȼºݤΥХ��Ȥ��Τ��Ф��ơ�ʸ��ν��ϥ��˽��Ȥ��ȤǤ�� ޤȤ��ȡ��Х��ʥ��ϥץ��ޤ�"�Х��󤽤Τ��"�ȹͤ��Τ��Ǽ��Τ�Ŭ��ʸ��ϥƥ��Ȥ��Ǽ��Τ�Ŭ��Ƥ��ޤ��

bytea��Ѥ�2�Ĥγ��񼰤򥵥ݡ��Ȥ��ޤ�� PostgreSQL��Ū��"��"�񼰤�"hex"�Ǥ�� ϤǤϤ��ξ��Ȥ��˼��ޤ�� Ͻ񼰤�bytea_output��ѥ�᡼��˰�¸��ǥե��ȤǤ�hex�Ǥ�� hex�񼰤�PostgreSQL 9.0��Ƴ��줿��ΤǤ��뤳�Ȥ��դ��Ƥ�� ΥС��Υġ��ǤϤ��򤷤ޤ��󡣡�

ɸ��SQL�ϡ�BLOB�ޤ��BINARY LARGE OBJECT�Ȥ��ۤʤ�Х��ʥ��󷿤��ޤ�� Ͻ񼰤�bytea�Ȱۤʤ�ޤ��󶡤��ؿ��ӱ黻�ҤϤۤ�Ʊ��Ǥ��

8.4.1. `bytea` hex��

"hex"�񼰤ǤϥХ��ʥ�ǡ��Х��ñ�̤Ǿ�̤�1/2�Х��Ȥ��Ƭ��2��16�ʿ��沽��ޤ�� ʥ��׽񼰤ȶ��̤��뤿��ˡ�ʸ��Τ�\x�Ȥ��¤Ӥθ��դ��ޤ�� ʸ̮�Ǥϡ��׽񼰤ǥХå��å��Ťˤ��ʤ��Фʤ�ʤ��ξ��ˤ��ơ��Ƭ�ΥХå��å��Ťˤ��ƥ��פ��ɬ�פ��뤫�⤷��ޤ�� ܺ٤��դ��Ƥϸ��ޤ�� 16�ʿ��η��ʸ��Ǥ⾮ʸ��Ǥ⹽��ޤ�� Ȥ߹�碌�ȼ��Ȥ߹�碌�δ֤˶��ʸ��뤳�Ȥ��Ǥ��ޤ�� ʤ��Ȥ߹�碌�δ֤��Ƭ��\x�δ֤ˤ��뤳�ȤϤǤ��ޤ��󡣡� hex�񼰤ϳ��Υ��ץꥱ��󤪤�ӥץ��ȥ��δ֤ǹ��ߴ��ޤ��׽񼰤��Ѵ��®�ˤʤ뷹��ޤ�� Τ��Ѥ��ޤ�ޤ��

��

SELECT E'\\xDEADBEEF';

8.4.2. `bytea`��׽�

"��"�񼰤�bytea��Ѥ��Ū��PostgreSQL�ν񼰤Ǥ�� ϡ��Х��ʥ��ASCIIʸ��¤ӤȤ��ɽ��ASCIIʸ��Ȥ��ɽ��Ǥ��ʤ��Х��Ȥ��ü�ʥ��ץ��󥹤Ȥ��ɽ��Ȥ��ޤ�� ץꥱ��θ��Ϥ��ʸ��Ȥ��ɽ��줿�Х��Ȥ�ͭ�դǤ��С��ɽ��ϴ��ؤǤ�� ¤ˤϥХ��ʥ��ʸ��δ֤ζ��̤��ޤ��ˤʤ�ޤ��Τǡ��̾�Ϻ��𤷤ޤ�� ޤ��ä��򤵤줿��׵��¿��ΨŪ�Ǥ�� Τ��ᤳ�ν񼰤Ϥ��餯�ۤȤ�ɤο��ץꥱ��Ǥ��򤱤�٤��Ǥ��礦��

��׽񼰤�bytea�ͤ��Ϥ��ݤˡ��ͤΥ��ƥåȤ򥨥��פ��ɬ����ޤ�� ʤ��٤ƤΥ��ƥåȤ��ͤ򥨥��פ��뤳�Ȥ��Ǥ��ޤ��� Ū�ˤ��륪��ƥåȤ򥨥��פ��ˤϡ��򤽤�3��8��ֹ��Ѵ��Хå��å��(��ʸ��ʸ��Ѥ��ƥ�ƥ��Ȥ��ͤ򵭽Ҥ��2�ĤΥХå��å��)��դ��ޤ�� ¾�ˤ�Хå��å��弫��(��ƥå��92)��ŤΥХå��å��Ȥ��ɽ��뤳�Ȥ��Ǥ��ޤ�� 表8-7�ˤϡ��פ��ɬ�פ��ʸ��ȡ��Ŭ�Ѳ�ǽ��إ��ץ��󥹤򼨤��Ƥ��ޤ��

表 8-7. ��ƥåȤ򥨥��פ��bytea��ƥ��

10�ʥ��ƥå��	��	��פ��줿��ɽ��	��	��ɽ��
0	��ƥå�	`E'\\000'`	`SELECT E'\\000'::bytea;`	`\000`
39	ñ��	`''''`�⤷��`E'\\047'`	`SELECT E'\''::bytea;`	`'`
92	�Хå��å��	`E'\\\\'`�⤷��`E'\\134'`	`SELECT E'\\\\'::bytea;`	`\\`
0 to 31 and 127 to 255	"ɽ��Ǥ��ʤ�"��ƥå�	`E'\\xxx'` (8�ʿ�)	`SELECT E'\\001'::bytea;`	`\001`

�ºݤˤϡ�ɽ��Ǥ��ʤ���ƥåȤ��Ф��륨��׵�ϥ��˰�¸��Ѳ��ޤ�� 󥹥��󥹤ˤ�äƤϡ��פ򤷤ʤ��ǺѤळ�Ȥ⤢��ޤ�� 表8-7��γƷ�̤ϡ��ɽ��Ȥ��ƣ�ʸ��ʾ�Ǥ��äƤ⡢Ĺ��Τ�1��ƥåȤǤ��뤳�Ȥ��դ��Ƥ��

表8-7�Ǽ��褦�ˡ�ʣ��Хå��å��夬ɬ�פ��ͳ�ϡ�ʸ��ƥ��Ȥ��Ƶ��Ҥ��줿��ʸ��ϡ�PostgreSQL��о��2�Ĥβ��ʳ��̲᤹��ɬ�פ��뤳�ȤǤ�� Ȥ߹�碌�κǽ�ΥХå��å��ʸ��ƥ��ѥѡ��ǥ��ʸ��Ȳ��ʥ��ʸ��ʸ�λ��Ѥ��ˤ��졢2��ܤΥХå��å��Ĥ��ơ��Ǿ��񤵤�ޤ�� ʤ��ʳ��Υ��פ��򤱤뤿��˥ɥ��ˤ��ʸ��Ѥ��뤳�Ȥ��Ǥ��ޤ�� Ĥ�ΥХå��å��ϡ�bytea��ϴؿ��3��Υ��ƥå��ͤ��Ƭ��դ��桢�⤷��ϡ�¾�ΥХå��å��򥨥��פ��뵭��Ȥ��ǧ��ޤ�� 㤨�С�E'\\001'�Ȥ��ƥ��Ф��Ϥ��줿ʸ��ƥ��ϡ��ʸ��ѡ��̲ᤷ��\001�Τ褦�ˤʤ�ޤ�� \001�Ϥ��θ�bytea��ϴؿ��졢10�ʿ��1��1�ĤΥ��ƥåȤ��Ѵ��ޤ�� ñ��ʸ��bytea�Ǥ��̤˰��줺��̾��ʸ��ƥ��ε�§�˽��Ȥ��դ��Ƥ�� 項4.1.2.1�⻲�Ȥ��Ƥ��

�ޤ��Bytea��ƥåȤϽ��ϻ��פ��ޤ�� Ū�ˤϡ��"ɽ��Ǥ��ʤ�"��ƥåȤϡ�1�ĤΥХå��å��θ��3��8�ʿ��Ȥ��Ѵ��ޤ�� ۤȤ�ɤ�"ɽ��Ǥ��"��ƥåȤϡ��饤��ʸ��åȤˤ��ɸ��ɽ��ɽ��ޤ�� 10�ʿ��92�Ȥʤ륪��ƥåȡʥХå��å��ˤϽ��ϤǤ��Ťˤʤ�ޤ�� ܺ٤�表8-8�˼��ޤ��

表 8-8. bytea��ϤΥ��פ��줿��ƥå�

10�ʥ��ƥå��	��	��פ��줿��ɽ��	��	��Ϸ��
92	�Хå��å��	`\\`	`SELECT E'\\134'::bytea;`	`\\`
0��31��127��255	"ɽ��Ǥ��ʤ�"��ƥå�	`\xxx`��8�ʿ��	`SELECT E'\\001'::bytea;`	`\001`
32��126	"ɽ��Ǥ��"��ƥå�	��饤��ʸ��åȤˤ��ɽ��	`SELECT E'\\176'::bytea;`	`~`

��Ѥ��PostgreSQL�Υե��ȥ��ɤˤ�äƤϡ�byteaʸ��򥨥��פޤ��ϥ��󥨥��פ��ݤˡ��ɲ�Ū�ʺ�Ȥ�ɬ�פˤʤ뤳�Ȥ��ޤ�� 㤨�С��Ѥ��륤�󥿥ե��ʸ��ʸ��ưŪ��Ƥ��ޤ��硢��ʸ��⥨��פ��ʤ��Фʤ�ʤ��⤷��ޤ��

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8.4. �Х��ʥ���ǡ�����

8.4.1. bytea hex��

8.4.2. bytea���������׽�

8.4. �Х��ʥ��ǡ��

8.4.1. `bytea` hex��

8.4.2. `bytea`��׽�