{"id":200115,"date":"2025-05-06T11:21:31","date_gmt":"2025-05-06T03:21:31","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200115\/"},"modified":"2025-05-06T11:21:31","modified_gmt":"2025-05-06T03:21:31","slug":"%e4%bb%8e-mysql-%e8%bf%81%e7%a7%bb%e5%88%b0-postgresql","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200115\/","title":{"rendered":"\u4ece MySQL \u8fc1\u79fb\u5230 PostgreSQL"},"content":{"rendered":"

<\/b> <\/p>\n

\u4ece MySQL \u8fc1\u79fb\u5230 PostgreSQL<\/h1>\n

\u4ece\u73b0\u5728\u5f00\u59cb\uff0c\u52aa\u529b\u5b66\u4e60\u5427\uff01\u672c\u6587\u4e3b\u8981\u8bb2\u89e3\u4e86\u7b49\u7b49\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u6211\u4f1a\u5728\u4e3b\u673a\u5b9d\u8d1d\u4e2d\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u7684\u7cfb\u5217\u6587\u7ae0\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u5e76\u79ef\u6781\u7559\u8a00\u5efa\u8bae\u3002\u4e0b\u9762\u5c31\u5148\u4e00\u8d77\u6765\u770b\u4e00\u4e0b\u672c\u7bc7\u6b63\u6587\u5185\u5bb9\u5427\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n

<\/p>\n

\u5c06\u6570\u636e\u5e93\u4ece mysql \u8fc1\u79fb\u5230 postgres \u662f\u4e00\u4e2a\u5177\u6709\u6311\u6218\u6027\u7684\u8fc7\u7a0b\u3002 <\/p>\n

\u867d\u7136 mysql \u548c postgres \u6267\u884c\u7c7b\u4f3c\u7684\u5de5\u4f5c\uff0c\u4f46\u5b83\u4eec\u4e4b\u95f4\u5b58\u5728\u4e00\u4e9b\u6839\u672c\u5dee\u5f02\uff0c\u8fd9\u4e9b\u5dee\u5f02\u53ef\u80fd\u4f1a\u4ea7\u751f\u9700\u8981\u89e3\u51b3\u624d\u80fd\u6210\u529f\u8fc1\u79fb\u7684\u95ee\u9898\u3002<\/p>\n

\u4ece\u54ea\u513f\u5f00\u59cb\uff1f <\/h2>\n

pg loader \u662f\u4e00\u4e2a\u53ef\u4ee5\u7528\u6765\u5c06\u6570\u636e\u79fb\u52a8\u5230 postgresql \u7684\u5de5\u5177\uff0c\u4f46\u662f\uff0c\u5b83\u5e76\u4e0d\u5b8c\u7f8e\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u53ef\u4ee5\u5f88\u597d\u5730\u5de5\u4f5c\u3002\u503c\u5f97\u4e00\u770b\uff0c\u770b\u770b\u8fd9\u662f\u5426\u662f\u4f60\u60f3\u8981\u8d70\u7684\u65b9\u5411\u3002 <\/p>\n

\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u521b\u5efa\u81ea\u5b9a\u4e49\u811a\u672c\u3002 <\/p>\n

\u81ea\u5b9a\u4e49\u811a\u672c\u63d0\u4f9b\u4e86\u66f4\u5927\u7684\u7075\u6d3b\u6027\u548c\u8303\u56f4\u6765\u89e3\u51b3\u7279\u5b9a\u4e8e\u60a8\u7684\u6570\u636e\u96c6\u7684\u95ee\u9898\u3002<\/p>\n

\u5728\u672c\u6587\u4e2d\uff0c\u6784\u5efa\u4e86\u81ea\u5b9a\u4e49\u811a\u672c\u6765\u5904\u7406\u8fc1\u79fb\u8fc7\u7a0b\u3002<\/p>\n

\u5bfc\u51fa\u6570\u636e <\/h2>\n

\u6570\u636e\u5982\u4f55\u5bfc\u51fa\u5bf9\u4e8e\u8fc1\u79fb\u7684\u987a\u5229\u8fdb\u884c\u81f3\u5173\u91cd\u8981\u3002\u5728\u9ed8\u8ba4\u8bbe\u7f6e\u4e2d\u4f7f\u7528 mysqldump \u5c06\u5bfc\u81f4\u66f4\u56f0\u96be\u7684\u8fc7\u7a0b\u3002<\/p>\n

\u4f7f\u7528 –\u517c\u5bb9=ansi \u9009\u9879\u4ee5 postgresql \u9700\u8981\u7684\u683c\u5f0f\u5bfc\u51fa\u6570\u636e\u3002<\/p>\n

\u4e3a\u4e86\u4f7f\u8fc1\u79fb\u66f4\u5bb9\u6613\u5904\u7406\uff0c\u8bf7\u5c06\u67b6\u6784\u548c\u6570\u636e\u8f6c\u50a8\u5206\u5f00\uff0c\u4ee5\u4fbf\u53ef\u4ee5\u5355\u72ec\u5904\u7406\u5b83\u4eec\u3002\u6bcf\u4e2a\u6587\u4ef6\u7684\u5904\u7406\u8981\u6c42\u90fd\u975e\u5e38\u4e0d\u540c\uff0c\u4e3a\u6bcf\u4e2a\u6587\u4ef6\u521b\u5efa\u4e00\u4e2a\u811a\u672c\u5c06\u4f7f\u5176\u66f4\u6613\u4e8e\u7ba1\u7406\u3002 <\/p>\n

\u67b6\u6784\u5dee\u5f02 <\/h2>\n

\u6570\u636e\u7c7b\u578b <\/h4>\n

mysql \u548c postgresql \u4e2d\u53ef\u7528\u7684\u6570\u636e\u7c7b\u578b\u5b58\u5728\u5dee\u5f02\uff0c\u8fd9\u610f\u5473\u7740\u5728\u5904\u7406\u67b6\u6784\u65f6\uff0c\u60a8\u9700\u8981\u786e\u5b9a\u54ea\u4e9b\u5b57\u6bb5\u6570\u636e\u7c7b\u578b\u6700\u9002\u5408\u60a8\u7684\u6570\u636e\u3002 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7c7b\u522b<\/th>\nmysql<\/th>\npostgresql<\/th>\n<\/tr>\n<\/thead>\n
\u6570\u5b57<\/td>\nint\u3001tinyint\u3001smallint\u3001mediumint\u3001bigint\u3001float\u3001double\u3001decimal<\/td>\n\u6574\u6570\u3001smallint\u3001bigint\u3001\u6570\u5b57\u3001\u5b9e\u6570\u3001\u53cc\u7cbe\u5ea6\u3001\u4e32\u884c\u3001\u5c0f\u4e32\u884c\u3001\u5927\u4e32\u884c<\/td>\n<\/tr>\n
\u5b57\u7b26\u4e32<\/td>\nchar\u3001varchar\u3001tinytext\u3001text\u3001mediumtext\u3001longtext<\/td>\nchar\u3001varchar\u3001\u6587\u672c<\/td>\n<\/tr>\n
\u65e5\u671f\u548c\u65f6\u95f4<\/td>\n\u65e5\u671f\u3001\u65f6\u95f4\u3001\u65e5\u671f\u65f6\u95f4\u3001\u65f6\u95f4\u6233\u3001\u5e74\u4efd<\/td>\n\u65e5\u671f\u3001\u65f6\u95f4\u3001\u65f6\u95f4\u6233\u3001\u95f4\u9694\u3001\u65f6\u95f4\u6233<\/td>\n<\/tr>\n
\u4e8c\u8fdb\u5236<\/td>\n\u4e8c\u8fdb\u5236\u3001varbinary\u3001tinyblob\u3001blob\u3001mediumblob\u3001longblob<\/td>\n\u5b57\u8282\u8336<\/td>\n<\/tr>\n
\u5e03\u5c14\u503c<\/td>\n\u5e03\u5c14\u503c\uff08tinyint(1)\uff09<\/td>\n\u5e03\u5c14\u503c<\/td>\n<\/tr>\n
\u679a\u4e3e\u548c\u96c6\u5408<\/td>\n\u679a\u4e3e\uff0c\u8bbe\u7f6e<\/td>\nenum\uff08\u6ca1\u6709\u7b49\u6548\u7684 set\uff09<\/td>\n<\/tr>\n
json<\/td>\njson<\/td>\njson\u3001jsonb<\/td>\n<\/tr>\n
\u51e0\u4f55<\/td>\n\u51e0\u4f55\u3001\u70b9\u3001\u7ebf\u3001\u591a\u8fb9\u5f62<\/td>\n\u70b9\u3001\u7ebf\u3001lseg\u3001\u6846\u3001\u8def\u5f84\u3001\u591a\u8fb9\u5f62\u3001\u5706<\/td>\n<\/tr>\n
\u7f51\u7edc\u5730\u5740<\/td>\n\u6ca1\u6709\u5185\u7f6e\u7c7b\u578b<\/td>\ncidr\u3001inet\u3001macaddr<\/td>\n<\/tr>\n
uuid<\/td>\n\u6ca1\u6709\u5185\u7f6e\u7c7b\u578b\uff08\u53ef\u4ee5\u4f7f\u7528char(36)\uff09<\/td>\nuuid<\/td>\n<\/tr>\n
\u6570\u7ec4<\/td>\n\u6ca1\u6709\u5185\u7f6e\u652f\u6301<\/td>\n\u652f\u6301\u4efb\u4f55\u6570\u636e\u7c7b\u578b\u7684\u6570\u7ec4<\/td>\n<\/tr>\n
xml<\/td>\n\u6ca1\u6709\u5185\u7f6e\u7c7b\u578b<\/td>\nxml<\/td>\n<\/tr>\n
\u8303\u56f4\u7c7b\u578b<\/td>\n\u6ca1\u6709\u5185\u7f6e\u652f\u6301<\/td>\nint4range\u3001int8range\u3001numrange\u3001tsrange\u3001tstzrange\u3001daterange<\/td>\n<\/tr>\n
\u590d\u5408\u7c7b\u578b<\/td>\n\u6ca1\u6709\u5185\u7f6e\u652f\u6301<\/td>\n\u7528\u6237\u5b9a\u4e49\u7684\u590d\u5408\u7c7b\u578b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

tinyint \u5b57\u6bb5\u7c7b\u578b <\/h4>\n

tinyint \u5728 postgresql \u4e2d\u4e0d\u5b58\u5728\u3002\u60a8\u53ef\u4ee5\u9009\u62e9\u4f7f\u7528smallint \u6216boolean \u6765\u66ff\u6362\u5b83\u3002\u9009\u62e9\u4e0e\u5f53\u524d\u6570\u636e\u96c6\u6700\u76f8\u4f3c\u7684\u6570\u636e\u7c7b\u578b\u3002<\/p>\n

 $line =~ s\/\\btinyint(?:\\(\\d+\\))?\\b\/smallint\/gi;\n<\/pre>\n
 \u679a\u4e3e\u5b57\u6bb5\u7c7b\u578b <\/h4>\n
\u679a\u4e3e\u5b57\u6bb5\u7a0d\u5fae\u590d\u6742\u4e00\u4e9b\uff0c\u867d\u7136 postgresql \u4e2d\u5b58\u5728\u679a\u4e3e\uff0c\u4f46\u5b83\u4eec\u9700\u8981\u521b\u5efa\u81ea\u5b9a\u4e49\u7c7b\u578b\u3002<\/p>\n
\u4e3a\u4e86\u907f\u514d\u91cd\u590d\u81ea\u5b9a\u4e49\u7c7b\u578b\uff0c\u6700\u597d\u89c4\u5212\u51fa\u9700\u8981\u54ea\u4e9b\u679a\u4e3e\u7c7b\u578b\uff0c\u5e76\u521b\u5efa\u67b6\u6784\u6240\u9700\u7684\u6700\u5c11\u6570\u91cf\u7684\u81ea\u5b9a\u4e49\u7c7b\u578b\u3002\u81ea\u5b9a\u4e49\u7c7b\u578b\u4e0d\u662f\u7279\u5b9a\u4e8e\u8868\u7684\uff0c\u4e00\u79cd\u81ea\u5b9a\u4e49\u7c7b\u578b\u53ef\u4ee5\u5728\u591a\u4e2a\u8868\u4e0a\u4f7f\u7528\u3002<\/p>\n
create type color_enum as enum ('blue', 'green');\n\n...\n\"shirt_color\" color_enum not null default 'blue',\n\"pant_color\" color_enum not null default 'green',\n...\n<\/pre>\n
\u7c7b\u578b\u7684\u521b\u5efa\u9700\u8981\u5728\u5bfc\u5165 sql \u4e4b\u524d\u5b8c\u6210\u3002\u7136\u540e\u53ef\u4ee5\u8c03\u6574\u811a\u672c\u4ee5\u4f7f\u7528\u5df2\u521b\u5efa\u7684\u81ea\u5b9a\u4e49\u7c7b\u578b\u3002 <\/p>\n
\u5982\u679c\u6709\u591a\u4e2a\u5b57\u6bb5\u4f7f\u7528 enum(‘blue’,’green’)\uff0c\u8fd9\u4e9b\u5b57\u6bb5\u90fd\u5e94\u8be5\u4f7f\u7528\u76f8\u540c\u7684 enum \u81ea\u5b9a\u4e49\u7c7b\u578b\u3002\u4e3a\u6bcf\u4e2a\u5355\u72ec\u7684\u5b57\u6bb5\u521b\u5efa\u81ea\u5b9a\u4e49\u7c7b\u578b\u5e76\u4e0d\u662f\u597d\u7684\u6570\u636e\u5e93\u8bbe\u8ba1\u3002<\/p>\n
if ( $line =~ \/\"([^\"]+)\"\\s+enum\\(([^)]+)\\)\/ ) {\n    my $column_name = $1;\n    my $enum_values = $2;\n    if ( $enum_values !~ \/''\/ ) {\n        $enum_values .= \",''\";\n    }\n\n    my @items = $enum_values =~ \/'([^']*)'\/g;\n\n    my $sorted_enum_values = join( ',', sort @items );\n\n    my $enum_type_name;\n    if ( exists $enum_types{$sorted_enum_values} ) {\n        $enum_type_name = $enum_types{$sorted_enum_values};\n    }\n    else {\n        $enum_type_name = create_enum_type_name($sorted_enum_values);\n        $enum_types{$sorted_enum_values} = $enum_type_name;\n\n        # add create type statement to post-processing\n        push @enum_lines,\n        \"create type $enum_type_name as enum ($enum_values);\\n\";\n    }\n\n    # replace the line with the new enum type\n    $line =~ s\/enum\\([^)]+\\)\/$enum_type_name\/;\n}\n\n<\/pre>\n
 \u7d22\u5f15 <\/h4>\n
\u7d22\u5f15\u7684\u521b\u5efa\u65b9\u5f0f\u5b58\u5728\u5dee\u5f02\u3002\u7d22\u5f15\u6709\u4e24\u79cd\u53d8\u4f53\uff1a\u6709\u5b57\u7b26\u9650\u5236\u7684\u7d22\u5f15\u548c\u65e0\u5b57\u7b26\u9650\u5236\u7684\u7d22\u5f15\u3002\u8fd9\u4e24\u4e2a\u90fd\u9700\u8981\u5904\u7406\u5e76\u4ece sql \u4e2d\u5220\u9664\uff0c\u5e76\u653e\u5165\u4e00\u4e2a\u5355\u72ec\u7684 sql \u6587\u4ef6\u4e2d\uff0c\u4ee5\u4fbf\u5728\u5bfc\u5165\u5b8c\u6210\u540e\u8fd0\u884c (run_after.sql)\u3002<\/p>\n
if ($line =~ \/^\\s*key\\s+\/i) {\n    if ($line =~ \/key\\s+\"([^\"]+)\"\\s+\\(\"([^\"]+)\"\\)\/) {\n        my $index_name = $1;\n        my $column_name = $2;\n        push @post_process_lines, \"create index idx_${current_table}_$index_name on \\\"$current_table\\\" (\\\"$column_name\\\");\\n\";\n    } elsif ($line =~ \/key\\s+\"([^\"]+)\"\\s+\\(\"([^\"]+)\"\\((\\d+)\\)\\)\/i) {\n        my $index_name = $1;\n        my $column_name = $2;\n        my $prefix_length = $3;\n        push @post_process_lines, \"create index idx_${current_table}_$index_name on \\\"$current_table\\\" (left(\\\"$column_name\\\", $prefix_length));\\n\";\n    }\n    next;\n}\n<\/pre>\n
\u5168\u6587\u7d22\u5f15\u5728 postgresql \u4e2d\u7684\u5de5\u4f5c\u65b9\u5f0f\u5b8c\u5168\u4e0d\u540c\u3002\u8981\u521b\u5efa\u5168\u6587\u7d22\u5f15\uff0c\u7d22\u5f15\u5fc5\u987b\u5c06\u6570\u636e\u8f6c\u6362\u4e3a\u5411\u91cf\u3002 <\/p>\n
\u7136\u540e\u53ef\u4ee5\u5bf9\u5411\u91cf\u8fdb\u884c\u7d22\u5f15\u3002\u7d22\u5f15\u5411\u91cf\u65f6\u6709\u4e24\u79cd\u7d22\u5f15\u7c7b\u578b\u53ef\u4f9b\u9009\u62e9\u3002 gin \u548c gist\u3002\u4e24\u8005\u90fd\u6709\u4f18\u70b9\u548c\u7f3a\u70b9\u3002\u4e00\u822c\u6765\u8bf4\uff0cgin \u4f18\u4e8e gist\u3002\u867d\u7136 gin \u6784\u5efa\u7d22\u5f15\u7684\u901f\u5ea6\u8f83\u6162\uff0c\u4f46\u200b\u200b\u67e5\u627e\u901f\u5ea6\u66f4\u5feb\u3002<\/p>\n
if ( $line =~ \/^\\s*fulltext\\s+key\\s+\"([^\"]+)\"\\s+\\(\"([^\"]+)\"\\)\/i ) {\n    my $index_name  = $1;\n    my $column_name = $2;\n    push @post_process_lines,\n    \"create index idx_fts_${current_table}_$index_name on \\\"$current_table\\\" using gin (to_tsvector('english', \\\"$column_name\\\"));\\n\";\n    next;\n}\n<\/pre>\n
 \u81ea\u52a8\u9012\u589e <\/h4>\n
postgresql \u4e0d\u4f7f\u7528 autoincrment \u5173\u952e\u5b57\uff0c\u800c\u662f\u4f7f\u7528 generated always as identity\u3002 <\/p>\n
\u5bfc\u5165\u6570\u636e\u65f6\u4f7f\u7528 generated always as identity \u6709\u4e00\u4e2a\u95ee\u9898\u3002 generated always as identity\u4e0d\u662f\u4e3a\u5bfc\u5165id\u800c\u8bbe\u8ba1\u7684\uff0c\u5f53\u5411\u8868\u4e2d\u63d2\u5165\u884c\u65f6\uff0c\u4e0d\u80fd\u6307\u5b9aid\u5b57\u6bb5\u3002 id \u503c\u5c06\u81ea\u52a8\u751f\u6210\u3002\u5c1d\u8bd5\u5c06\u60a8\u81ea\u5df1\u7684 id \u63d2\u5165\u8be5\u884c\u5c06\u4f1a\u4ea7\u751f\u9519\u8bef\u3002 <\/p>\n
\u8981\u89e3\u51b3\u6b64\u95ee\u9898\uff0c\u53ef\u4ee5\u5c06 id \u5b57\u6bb5\u8bbe\u7f6e\u4e3a serial \u7c7b\u578b\uff0c\u800c\u4e0d\u662f int generated always as identity\u3002 serial \u5bf9\u4e8e\u5bfc\u5165\u6765\u8bf4\u66f4\u52a0\u7075\u6d3b\uff0c\u4f46\u4e0d\u5efa\u8bae\u5c06\u8be5\u5b57\u6bb5\u4fdd\u7559\u4e3a serial\u3002<\/p>\n
\u4f7f\u7528\u6b64\u65b9\u6cd5\u7684\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u5c06 overriding system value \u6dfb\u52a0\u5230\u63d2\u5165\u67e5\u8be2\u4e2d\u3002<\/p>\n
insert into table (id, name)\noverriding system value\nvalues (100, 'a name');\n<\/pre>\n
\u5982\u679c\u60a8\u4f7f\u7528 serial\uff0c\u5219\u9700\u8981\u5c06\u4e00\u4e9b\u67e5\u8be2\u5199\u5165 run_after.sql\uff0c\u4ee5\u5c06 serial \u66f4\u6539\u4e3a generated always as identity\uff0c\u5e76\u5728\u521b\u5efa schema \u5e76\u63d2\u5165\u6570\u636e\u540e\u91cd\u7f6e\u5185\u90e8\u8ba1\u6570\u5668\u3002<\/p>\n
if ( $line =~ \/^\\s*\"(\\w+)\"\\s+(int|bigint)\\s+not\\s+null\\s+auto_increment\\s*,\/i ) {\n    my $column_name = $1;\n    $line =~ s\/^\\s*\"$column_name\"\\s+(int|bigint)\\s+not\\s+null\\s+auto_increment\\s*,\/\"$column_name\" serial,\/;\n\n    push @post_process_lines, \"alter table \\\"$current_table\\\" alter column \\\"$column_name\\\" drop default;\\n\";\n\n    push @post_process_lines, \"drop sequence ${current_table}_${column_name}_seq;\\n\";\n\n    push @post_process_lines, \"alter table \\\"$current_table\\\" alter column \\\"$column_name\\\" add generated always as identity;\\n\";\n\n    push @post_process_lines, \"select setval('${current_table}_${column_name}_seq', (select coalesce(max(\\\"$column_name\\\"), 1) from \\\"$current_table\\\"));\\n\\n\";\n\n}\n<\/pre>\n
 \u67b6\u6784\u7ed3\u679c <\/h2>\n
 \u4ecemysql\u5bfc\u51fa\u540e\u7684\u539f\u59cb\u6a21\u5f0f <\/h4>\n
drop table if exists \"address_book\";\n\/*!40101 set @saved_cs_client     = @@character_set_client *\/;\n\/*!40101 set character_set_client = utf8 *\/;\ncreate table \"address_book\" (\n  \"id\" int not null auto_increment,\n  \"user_id\" varchar(50) not null,\n  \"common_name\" varchar(50) not null,\n  \"display_name\" varchar(50) not null,\n  primary key (\"id\"),\n  key \"user_id\" (\"user_id\")\n);\n<\/pre>\n
 \u5904\u7406\u7684\u4e3b\u8981 sql \u6587\u4ef6 <\/h4>\n
drop table if exists \"address_book\";\ncreate table \"address_book\" (\n  \"id\" serial,\n  \"user_id\" varchar(85) not null,\n  \"common_name\" varchar(85) not null,\n  \"display_name\" varchar(85) not null,\n  primary key (\"id\")\n);\n<\/pre>\n
 \u8fd0\u884c\u540e.sql <\/h4>\n
alter table \"address_book\" alter column \"id\" drop default;\ndrop sequence address_book_id_seq;\nalter table \"address_book\" alter column \"id\" add generated always as identity;\nselect setval('address_book_id_seq', (select coalesce(max(\"id\"), 1) from \"address_book\"));\ncreate index idx_address_book_user_id on \"address_book\" (\"user_id\");\n\n<\/pre>\n
\u503c\u5f97\u6ce8\u610f\u7684\u662f\u8fc1\u79fb\u4e2d\u4f7f\u7528\u7684\u7d22\u5f15\u547d\u540d\u7ea6\u5b9a\u3002\u7d22\u5f15\u540d\u79f0\u5305\u62ec\u8868\u540d\u548c\u5b57\u6bb5\u540d\u3002 \u7d22\u5f15\u540d\u79f0\u5fc5\u987b\u662f\u552f\u4e00\u7684\uff0c\u4e0d\u4ec5\u5728\u6dfb\u52a0\u7d22\u5f15\u7684\u8868\u4e2d\uff0c\u800c\u4e14\u5728\u6574\u4e2a\u6570\u636e\u5e93\u4e2d\uff0c\u6dfb\u52a0\u8868\u540d\u79f0\u548c\u5217\u540d\u79f0\u53ef\u4ee5\u51cf\u5c11\u811a\u672c\u4e2d\u51fa\u73b0\u91cd\u590d\u7684\u673a\u4f1a\u3002 <\/p>\n
 \u6570\u636e\u5904\u7406 <\/h2>\n
\u8fc1\u79fb\u6570\u636e\u5e93\u7684\u6700\u5927\u969c\u788d\u662f\u5c06\u6570\u636e\u8f6c\u6362\u4e3a postgresql \u63a5\u53d7\u7684\u683c\u5f0f\u3002 postgresql \u5b58\u50a8\u6570\u636e\u7684\u65b9\u5f0f\u5b58\u5728\u4e00\u4e9b\u5dee\u5f02\uff0c\u9700\u8981\u989d\u5916\u6ce8\u610f\u3002 <\/p>\n
 \u5b57\u7b26\u96c6 <\/h4>\n
\u672c\u6587\u4f7f\u7528\u7684\u6570\u636e\u96c6\u65e9\u4e8eutf8mb4\uff0c\u5e76\u4f7f\u7528\u65e7\u7684\u9ed8\u8ba4latin1\uff0c\u8be5\u5b57\u7b26\u96c6\u4e0epostgresql\u9ed8\u8ba4\u5b57\u7b26\u96c6utf8\u4e0d\u517c\u5bb9\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cpostgresql utf8\u4e5f\u4e0emysql\u7684utf8mb4\u4e0d\u540c\u3002 <\/p>\n
\u4ece latin1 \u8fc1\u79fb\u5230 utf8 \u7684\u95ee\u9898\u662f\u6570\u636e\u7684\u5b58\u50a8\u65b9\u5f0f\u3002\u5728 latin1 \u4e2d\u6bcf\u4e2a\u5b57\u7b26\u90fd\u662f\u4e00\u4e2a\u5b57\u8282\uff0c\u800c\u5728 utf8 \u4e2d\u5b57\u7b26\u53ef\u4ee5\u662f\u591a\u5b57\u8282\uff0c\u6700\u591a 4 \u4e2a\u5b57\u8282\u3002<\/p>\n
\u5496\u5561\u9986\u8fd9\u4e2a\u8bcd\u5c31\u662f\u4e00\u4e2a\u4f8b\u5b50<\/p>\n
\u5728 latin1 \u4e2d\u6570\u636e\u5b58\u50a8\u4e3a 4 \u4e2a\u5b57\u8282\uff0c\u5728 utf8 \u4e2d\u5b58\u50a8\u4e3a 5 \u4e2a\u5b57\u8282\u3002\u5728\u5b57\u7b26\u96c6\u8fc1\u79fb\u671f\u95f4\uff0c\u4f1a\u8003\u8651\u5b57\u8282\u503c\uff0c\u5e76\u4e14\u53ef\u80fd\u4f1a\u5bfc\u81f4 utf8 \u4e2d\u7684\u6570\u636e\u88ab\u622a\u65ad\u3002 postgresql \u5c06\u5728\u6b64\u622a\u65ad\u65f6\u51fa\u9519\u3002 <\/p>\n
\u4e3a\u907f\u514d\u622a\u65ad\uff0c\u8bf7\u5411\u53d7\u5f71\u54cd\u7684 varchar \u5b57\u6bb5\u6dfb\u52a0\u586b\u5145\u3002<\/p>\n
\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u60a8\u66f4\u6539 mysql \u4e2d\u7684\u5b57\u7b26\u96c6\uff0c\u4e5f\u53ef\u80fd\u4f1a\u53d1\u751f\u540c\u6837\u7684\u622a\u65ad\u95ee\u9898\u3002<\/p>\n
 \u5b57\u7b26\u8f6c\u4e49 <\/h3>\n
\u5728\u6570\u636e\u5e93\u4e2d\u770b\u5230\u53cd\u659c\u6760\u8f6c\u4e49\u5355\u5f15\u53f7\u7684\u60c5\u51b5\u5e76\u4e0d\u5c11\u89c1\u3002<\/p>\n
\u4f46\u662f\uff0cpostgresql \u9ed8\u8ba4\u4e0d\u652f\u6301\u8fd9\u4e00\u70b9\u3002\u76f8\u53cd\uff0c\u4f7f\u7528\u4f7f\u7528\u53cc\u5355\u5f15\u53f7\u7684 ansi sql \u6807\u51c6\u65b9\u6cd5\u3002<\/p>\n
\u5982\u679c varchar \u5b57\u6bb5\u5305\u542b it’s \u5219\u9700\u8981\u66f4\u6539\u4e3a it’s<\/p>\n
 $line =~ s\/\\\\'\/\\'\\'\/g;\n<\/pre>\n
 \u8868\u9501\u5b9a <\/h4>\n
\u5728 sql \u8f6c\u50a8\u4e2d\uff0c\u6bcf\u6b21\u63d2\u5165\u4e4b\u524d\u90fd\u4f1a\u6709\u8868\u9501\u5b9a\u8c03\u7528\u3002<\/p>\n
lock tables \"address_book\" write;\n<\/pre>\n
postgresql \u4e2d\u4e00\u822c\u4e0d\u9700\u8981\u624b\u52a8\u9501\u5b9a\u8868\u3002<\/p>\n
postgresql \u4f7f\u7528\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff08mvcc\uff09\u6765\u5904\u7406\u4e8b\u52a1\u3002\u5f53\u66f4\u65b0\u4e00\u884c\u65f6\uff0c\u5b83\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7248\u672c\u3002\u4e00\u65e6\u65e7\u7248\u672c\u4e0d\u518d\u4f7f\u7528\uff0c\u5b83\u200b\u200b\u5c06\u88ab\u5220\u9664\u3002\u8fd9\u610f\u5473\u7740\u901a\u5e38\u4e0d\u9700\u8981\u8868\u9501\u5b9a\u3002 postgresql \u5c06\u4e0e mvcc \u4e00\u8d77\u4f7f\u7528\u9501\u6765\u63d0\u9ad8\u5e76\u53d1\u6027\u3002\u624b\u52a8\u8bbe\u7f6e\u9501\u4f1a\u5bf9\u5e76\u53d1\u6027\u4ea7\u751f\u8d1f\u9762\u5f71\u54cd\u3002 <\/p>\n
\u56e0\u6b64\uff0c\u4ece sql \u8f6c\u50a8\u4e2d\u5220\u9664\u624b\u52a8\u9501\u5e76\u8ba9 postgresql \u6839\u636e\u9700\u8981\u5904\u7406\u9501\u662f\u66f4\u597d\u7684\u9009\u62e9\u3002 <\/p>\n
 \u5bfc\u5165\u6570\u636e <\/h2>\n
\u8fc1\u79fb\u8fc7\u7a0b\u7684\u4e0b\u4e00\u6b65\u662f\u8fd0\u884c\u811a\u672c\u751f\u6210\u7684 sql \u6587\u4ef6\u3002\u5982\u679c\u524d\u9762\u7684\u6b65\u9aa4\u6b63\u786e\u5b8c\u6210\uff0c\u8fd9\u90e8\u5206\u5e94\u8be5\u662f\u4e00\u4e2a\u987a\u5229\u7684\u52a8\u4f5c\u3002\u5b9e\u9645\u53d1\u751f\u7684\u60c5\u51b5\u662f\uff0c\u5bfc\u5165\u53d1\u73b0\u4e86\u524d\u9762\u6b65\u9aa4\u4e2d\u672a\u53d1\u73b0\u7684\u95ee\u9898\uff0c\u9700\u8981\u8fd4\u56de\u5e76\u8c03\u6574\u811a\u672c\u5e76\u91cd\u8bd5\u3002 <\/p>\n
\u8981\u8fd0\u884c sql \u6587\u4ef6\uff0c\u8bf7\u4f7f\u7528 psql \u767b\u5f55 postgres \u6570\u636e\u5e93\u5e76\u8fd0\u884c\u5bfc\u5165\u529f\u80fd<\/p>\n
\\i \/path\/to\/converted_schema.sql\n<\/pre>\n
\u9700\u8981\u6ce8\u610f\u7684\u4e24\u4e2a\u4e3b\u8981\u9519\u8bef\uff1a<\/p>\n
\u9519\u8bef\uff1a\u5bf9\u4e8e\u7c7b\u578b\u5b57\u7b26\u53d8\u5316\u6765\u8bf4\u503c\u592a\u957f\uff0850\uff09<\/strong><\/p>\n
\u8fd9\u53ef\u4ee5\u901a\u8fc7\u589e\u52a0\u524d\u9762\u63d0\u5230\u7684 varchar \u5b57\u6bb5\u5b57\u7b26\u957f\u5ea6\u6765\u89e3\u51b3\u3002<\/p>\n
\u9519\u8bef\uff1a\u65e0\u6548\u547d\u4ee4 n<\/strong><\/p>\n
\u6b64\u9519\u8bef\u53ef\u80fd\u662f\u7531\u6742\u6563\u8f6c\u4e49\u5355\u5f15\u53f7\u6216\u5176\u4ed6\u4e0d\u517c\u5bb9\u7684\u6570\u636e\u503c\u5f15\u8d77\u7684\u3002\u8981\u4fee\u590d\u8fd9\u4e9b\u95ee\u9898\uff0c\u53ef\u80fd\u9700\u8981\u5c06\u6b63\u5219\u8868\u8fbe\u5f0f\u6dfb\u52a0\u5230\u6570\u636e\u5904\u7406\u811a\u672c\u4e2d\u4ee5\u9488\u5bf9\u7279\u5b9a\u95ee\u9898\u533a\u57df\u3002 <\/p>\n
\u5176\u4e2d\u4e00\u4e9b\u9519\u8bef\u9700\u8981\u66f4\u4ed4\u7ec6\u5730\u67e5\u770b\u63d2\u5165\u8bed\u53e5\u4ee5\u627e\u5230\u95ee\u9898\u6240\u5728\u3002\u8fd9\u5728\u5927\u578b sql \u6587\u4ef6\u4e2d\u53ef\u80fd\u5177\u6709\u6311\u6218\u6027\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u8bf7\u5c06\u51fa\u9519\u7684 insert \u8bed\u53e5\u5199\u5230\u4e00\u4e2a\u5355\u72ec\u7684\u3001\u66f4\u5c0f\u7684 sql \u6587\u4ef6\u4e2d\uff0c\u8fd9\u6837\u53ef\u4ee5\u66f4\u8f7b\u677e\u5730\u7814\u7a76\u8be5\u6587\u4ef6\u4ee5\u627e\u5230\u95ee\u9898\u3002<\/p>\n
my %lines_to_debug = map { $_ => 1 } (1148, 1195); \n ...\nif (exists $lines_to_debug{$current_line_number}) {\n    print $debug_data \"$line\";  \n}\n<\/pre>\n
 \u6570\u636e\u5206\u5757 <\/h2>\n
\u65e0\u8bba\u60a8\u9009\u62e9\u4f7f\u7528\u54ea\u79cd\u811a\u672c\u8bed\u8a00\u8fdb\u884c\u8fc1\u79fb\uff0c\u5206\u5757\u6570\u636e\u5bf9\u4e8e\u5927\u578b sql \u6587\u4ef6\u90fd\u975e\u5e38\u91cd\u8981\u3002 <\/p>\n
\u5bf9\u4e8e\u6b64\u811a\u672c\uff0c\u6570\u636e\u88ab\u5206\u6210 1mb \u7684\u5757\uff0c\u8fd9\u6709\u52a9\u4e8e\u4fdd\u6301\u811a\u672c\u7684\u6548\u7387\u3002\u60a8\u5e94\u8be5\u9009\u62e9\u5bf9\u60a8\u7684\u6570\u636e\u96c6\u6709\u610f\u4e49\u7684\u5757\u5927\u5c0f\u3002<\/p>\n
my $bytes_read = read( $original_data, $chunk, $chunk_size );\n<\/pre>\n
 \u9a8c\u8bc1\u6570\u636e <\/h2>\n
\u6709\u51e0\u79cd\u9a8c\u8bc1\u6570\u636e\u7684\u65b9\u6cd5<\/p>\n
 \u884c\u6570 <\/h4>\n
\u8fdb\u884c\u884c\u8ba1\u6570\u662f\u786e\u4fdd\u81f3\u5c11\u63d2\u5165\u6240\u6709\u884c\u7684\u7b80\u5355\u65b9\u6cd5\u3002\u8ba1\u7b97\u65e7\u6570\u636e\u5e93\u4e2d\u7684\u884c\u6570\u5e76\u5c06\u5176\u4e0e\u65b0\u6570\u636e\u5e93\u4e2d\u7684\u884c\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n
select count(*) from address_book\n<\/pre>\n
 \u6821\u9a8c\u548c <\/h4>\n
\u8de8\u5217\u8fd0\u884c\u6821\u9a8c\u548c\u53ef\u80fd\u4f1a\u6709\u6240\u5e2e\u52a9\uff0c\u4f46\u8bf7\u8bb0\u4f4f\uff0c\u67d0\u4e9b\u5b57\u6bb5\uff0c\u5c24\u5176\u662f varchar \u5b57\u6bb5\uff0c\u53ef\u80fd\u5df2\u66f4\u6539\u4e3a ansi \u6807\u51c6\u683c\u5f0f\u3002\u56e0\u6b64\uff0c\u867d\u7136\u8fd9\u9002\u7528\u4e8e\u67d0\u4e9b\u9886\u57df\uff0c\u4f46\u5b83\u4e0d\u4f1a\u5728\u6240\u6709\u9886\u57df\u90fd\u51c6\u786e\u3002<\/p>\n
\u5bf9\u4e8emysql<\/p>\n
select md5(group_concat(coalesce(user_id, '') order by id)) from address_book\n<\/pre>\n
\u5bf9\u4e8e postgresql<\/p>\n
SELECT MD5(STRING_AGG(COALESCE(user_id, ''), '' ORDER BY id)) FROM address_book\n<\/pre>\n
 \u624b\u52a8\u6570\u636e\u68c0\u67e5 <\/h4>\n
\u60a8\u8fd8\u9700\u8981\u901a\u8fc7\u624b\u52a8\u8fc7\u7a0b\u9a8c\u8bc1\u6570\u636e\u3002\u8fd0\u884c\u4e00\u4e9b\u6709\u610f\u4e49\u7684\u67e5\u8be2\uff0c\u8fd9\u4e9b\u67e5\u8be2\u53ef\u80fd\u4f1a\u53d1\u73b0\u5bfc\u5165\u95ee\u9898\u3002 <\/p>\n
 \u6700\u540e\u7684\u60f3\u6cd5 <\/h2>\n
\u8fc1\u79fb\u6570\u636e\u5e93\u662f\u4e00\u9879\u8270\u5de8\u7684\u4efb\u52a1\uff0c\u4f46\u53ea\u8981\u4ed4\u7ec6\u89c4\u5212\u5e76\u5145\u5206\u4e86\u89e3\u60a8\u7684\u6570\u636e\u96c6\u4ee5\u53ca\u4e24\u4e2a\u6570\u636e\u5e93\u7cfb\u7edf\u4e4b\u95f4\u7684\u5dee\u5f02\uff0c\u5c31\u53ef\u4ee5\u6210\u529f\u5b8c\u6210\u3002 <\/p>\n
\u8fc1\u79fb\u5230\u65b0\u6570\u636e\u5e93\u4e0d\u4ec5\u4ec5\u662f\u5bfc\u5165\uff0c\u4f46\u662f\u53ef\u9760\u7684\u6570\u636e\u96c6\u8fc1\u79fb\u5c06\u4f7f\u60a8\u5728\u5176\u4f59\u7684\u8fc7\u6e21\u8fc7\u7a0b\u4e2d\u5904\u4e8e\u6709\u5229\u4f4d\u7f6e\u3002<\/p>\n
\n
\u4e3a\u6b64\u8fc1\u79fb\u521b\u5efa\u7684\u811a\u672c\u53ef\u4ee5\u5728 git hub \u4e0a\u627e\u5230\u3002 <\/p>\n
\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300a\u4ece MySQL \u8fc1\u79fb\u5230 PostgreSQL\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u5427\uff01<\/p>\n
 \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb \u5220\u9664 <\/p>\n
\n
\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
\u4ece MySQL \u8fc1\u79fb\u5230 Post...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200115","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200115","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200115"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200115\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200115"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200115"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200115"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}