{"id":684,"date":"2011-12-08T17:42:54","date_gmt":"2011-12-08T09:42:54","guid":{"rendered":"http:\/\/nick.workao.org\/?p=684"},"modified":"2011-12-08T17:42:54","modified_gmt":"2011-12-08T09:42:54","slug":"%e4%bd%bf%e7%94%a8-sqlobject-%e8%bf%9e%e6%8e%a5%e6%95%b0%e6%8d%ae%e5%ba%93%e4%b8%8e-python","status":"publish","type":"post","link":"http:\/\/nick.txtcc.com\/index.php\/python\/684","title":{"rendered":"\u4f7f\u7528 SQLObject \u8fde\u63a5\u6570\u636e\u5e93\u4e0e Python"},"content":{"rendered":"

1\u3001\u5b89\u88c5\u548c\u8bbe\u7f6e SQLObject\n<\/strong>SQLObject \u5177\u6709\u4e00\u4e2a setup.py \u6587\u4ef6\uff0c\u5b89\u88c5\u65b9\u5f0f\u4e0e\u5176\u4ed6\u4efb\u4f55 Python \u5305\u4e00\u6837\u3002\u76f4\u63a5python setup.py\u5373\u53ef\uff0c\u5f53\u7136\u4f60\u4e5f\u53ef\u4ee5\u8fdb\u4e00\u6b65\u4f7f\u7528setup tools\u5373\u53ef\uff1aeasyinstall.exe sqlobject\u5373\u53ef\uff0c\u5475\u5475\uff0c\u5341\u5206\u7b80\u5355\u65b9\u4fbf\u54e6\u3002<\/p>\n

2\u3001\u6570\u636e\u5e93\u51c6\u5907\uff08\u672c\u6587\u4f7f\u7528mysql\u4e3a\u4f8b\uff09\n<\/strong>\u8981\u5b9e\u9645\u4f7f\u7528 SQLObject\uff0c\u9700\u8981\u8bbe\u7f6e\u6570\u636e\u5e93\u5305\u4ee5\u53ca\u8fd9\u79cd\u6570\u636e\u5e93\u7684 Python \u63a5\u53e3\u3002SQLObject \u8fde\u63a5\u591a\u79cd\u6570\u636e\u5e93\uff0c\u5176\u4e2d\u5305\u62ec\u4e09\u4e2a\u5927\u7684\u5f00\u653e\u6e90\u7801\u4ea7\u54c1\uff1aMySQL\u3001PostgreSQL \u548c\u65e0\u670d\u52a1\u5668 SQLite\u3002\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\nmysql> use mysql;\nDatabase changed\nmysql> create database sqlobject_demo;\nQuery OK, 1 row affected (0.00 sec)\nmysql> grant all privileges on sqlobject_demo to \u2018dbuser\u2019@’localhost\u2019\nidentified by \u2018dbpassword\u2019;\nQuery OK, 0 rows affected (0.00 sec)\nmysql> flush privileges;\nQuery OK, 0 rows affected (0.00 sec)\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-<\/p>\n

3\u3001\u8fde\u63a5\u6570\u636e\u5e93\n<\/strong>\u5982\u679c\u60f3\u8ba9\u5e94\u7528\u7a0b\u5e8f\u4f7f\u7528 SQLite \u6570\u636e\u5e93\uff0c\u5219\u9700\u8981\u5c06\u6570\u636e\u5e93\u6587\u4ef6\u7684\u8def\u5f84\u5199\u5165\u4f4d\u4e8esqlobject.sqlite \u5305\u7684 SQLite \u8fde\u63a5\u6784\u5efa\u5668\u4e2d\u3002\u5982\u679c\u6570\u636e\u5e93\u6587\u4ef6\u4e0d\u5b58\u5728\uff0cQLObject \u5c06\u544a\u8bc9 SQLite \u521b\u5efa\u4e00\u4e2a\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\nimport sqlobject\nfrom sqlobject.sqlite import builder\nconn = builder()(\u2018sqlobject_demo.db\u2019)\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n\u5982\u679c\u4f7f\u7528\u7684\u662f MySQL \u6216\u5e26\u6709\u670d\u52a1\u5668\u7684\u5176\u4ed6\u6570\u636e\u5e93\uff0c\u5219\u5c06\u6570\u636e\u5e93\u8fde\u63a5\u4fe1\u606f\u4f20\u9012\u5230\u8fde\u63a5\u6784\u5efa\u5668\u4e2d\u3002\u4e0a\u9762\u63d0\u4f9b\u4e86\u5728\u4e0a\u4e00\u8282\u521b\u5efa\u7684 MySQL \u6570\u636e\u5e93\u7684\u793a\u4f8b\u3002\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\nimport sqlobject\nfrom sqlobject.mysql import builder\nconn = builder()(user=\u2019dbuser\u2019, passwd=\u2019dbpassword\u2019,\nhost=\u2019localhost\u2019, db=\u2019sqlobject_demo\u2019)\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n\u4e0d\u7ba1\u8fde\u63a5\u54ea\u79cd\u6570\u636e\u5e93\uff0c\u8fde\u63a5\u4ee3\u7801\u90fd\u5e94\u8be5\u653e\u7f6e\u5728\u4e00\u4e2a\u540d\u79f0\u7c7b\u4f3c Connection.py \u7684\u6587\u4ef6\u4e2d\uff0c\u4e14\u8be5\u6587\u4ef6\u5b58\u50a8\u5728\u4e00\u4e9b\u901a\u5e38\u53ef\u8bbf\u95ee\u7684\u4f4d\u7f6e\u4e2d\u3002\u8fd9\u6837\uff0c\u53ef\u4ee5\u5bfc\u5165\u60a8\u5b9a\u4e49\u7684\u6240\u6709\u7c7b\uff0c\u5e76\u4f7f\u7528\u5df2\u7ecf\u6784\u5efa\u7684conn \u5bf9\u8c61\u3002conn \u53d8\u91cf\u5c06\u5305\u542b\u6240\u6709\u4e0e\u6570\u636e\u5e93\u76f8\u5173\u7684\u8be6\u7ec6\u4fe1\u606f\u3002\n\u6ce8\u610f\uff1aSQLObject \u7684\u4e00\u4e9b\u7279\u6027\u4e0d\u53ef\u7528\u4e8e SQLite \u6216 MySQL\u3002<\/p>\n

4\u3001\u5b9a\u4e49\u6a21\u5f0f\n<\/strong>SQLObject \u4f7f\u5f97\u64cd\u4f5c\u6570\u636e\u5e93\u8868\u53d8\u5f97\u5bb9\u6613\u3002\u770b\u7b2c\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u8003\u8651\u4e00\u4e2a\u7535\u8bdd\u7c3f\u5e94\u7528\u7a0b\u5e8f\u7684\u7531\u5355\u4e2a\u8868\u7ec4\u6210\u7684\u6570\u636e\u5e93\u6a21\u5f0f\uff0c\u5982\u4e0b\u6240\u793a\u3002\n\u5b57\u6bb5\u00a0\u00a0\u00a0 \u7c7b\u578b\u00a0\u00a0\u00a0 \u8bf4\u660e\nid\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Int\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u4e3b\u952e\nnumber\u00a0\u00a0\u00a0 String\u00a0\u00a0\u00a0 \u201c(###) ###-####\u201d\u5b57\u7b26\u4e32\u683c\u5f0f\uff1b\u5e94\u8be5\u60df\u4e00\nowner\u00a0\u00a0\u00a0 String\u00a0\u00a0\u00a0 \u8fd9\u662f\u8c01\u7684\u53f7\u7801\uff1f\nlast_call\u00a0\u00a0\u00a0 Date\u00a0\u00a0\u00a0 \u7528\u6237\u6700\u540e\u4e00\u6b21\u547c\u53eb\u8be5\u53f7\u7801\u662f\u4ec0\u4e48\u65f6\u5019\uff1f<\/p>\n

\u8be5\u8868\u7684 SQL \u7c7b\u4f3c\u5982\u4e0b\uff1a\nCREATE TABLE phone_number (\nid INT PRIMARY KEY AUTO_INCREMENT,\nnumber VARCHAR(14) UNIQUE,\nowner VARCHAR(255),\nlast_call DATETIME,\nnotes TEXT\n)\n\u4f7f\u7528 SQLObject\uff0c\u4e0d\u9700\u8981\u7f16\u5199\u8be5 SQL \u4ee3\u7801\u3002\u901a\u8fc7\u5b9a\u4e49 Python \u7c7b\u6765\u5b9a\u4e49\u8be5\u6570\u636e\u8868\u3002\u8be5\u4ee3\u7801\u5c06\u8fdb\u5165\u540d\u4e3a PhoneNumber.py \u7684\u6587\u4ef6\u4e2d\u3002\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\nimport sqlobject\nfrom Connection import conn<\/p>\n

class PhoneNumber(sqlobject.SQLObject):\n_connection = conn\nnumber = sqlobject.StringCol(length=14, unique=True)\nowner = sqlobject.StringCol(length=255)\nlastCall = sqlobject.DateTimeCol(default=None)\nPhoneNumber.createTable(ifNotExists=True)\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-<\/p>\n

\u5b9a\u4e49\u8868\u7684\u7c7b\u8fd8\u6709\u4e00\u7ec4\u5b9a\u4e49\u8868\u5b57\u6bb5\u7684\u6210\u5458\u3002SQLObject \u63d0\u4f9b\u4e86 StringCol\u3001BoolCol \u7b49\u7b49 \u2014\u2014 \u4e00\u4e2a\u7c7b\u5bf9\u5e94\u4e00\u79cd\u6570\u636e\u5e93\u5b57\u6bb5\u7c7b\u578b\u3002\ncreateTable() \u65b9\u6cd5\u7b2c\u4e00\u6b21\u8fd0\u884c\u65f6\uff0cSQLObject \u5c06\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a phone_number \u7684\u8868\u3002\u7136\u540e\uff0c\u5b83\u5c06\u53ea\u4f7f\u7528\u8be5\u8868\uff0c\u56e0\u4e3a\u60a8\u5c06 ifNotExists \u8bbe\u7f6e\u4e3a True \u6765\u8c03\u7528\u8be5\u65b9\u6cd5\u3002<\/p>\n

\u6700\u540e\u6ce8\u610f\uff0c\u65e0\u9700\u5728 PhoneNumber \u4e2d\u4e3a id \u5b57\u6bb5\u521b\u5efa\u5b57\u6bb5\u5bf9\u8c61\u3002\u56e0\u4e3a SQLObject \u603b\u662f\u9700\u8981\u8be5\u5b57\u6bb5\u5bf9\u8c61\uff0c\u6240\u4ee5\u5b83\u603b\u4f1a\u521b\u5efa\u4e00\u4e2a\u3002<\/p>\n

5\u3001\u5904\u7406CRUD\n<\/strong>\u8457\u540d\u7684\u7f29\u5199\u8bcd CRUD \u4ee3\u8868\u5bf9\u6570\u636e\u5e93\u884c\u8fdb\u884c\u7684\u56db\u79cd\u64cd\u4f5c\uff1aCreate\u3001Read\u3001Update \u548c Delete\u3002\u5b9a\u4e49\u4e86\u4e0e\u6570\u636e\u5e93\u8868\u5bf9\u5e94\u7684\u7c7b\u4e4b\u540e\uff0cSQLObject \u5c06\u5bf9\u8868\u884c\u7684\u64cd\u4f5c\u8868\u793a\u4e3a\u5bf9\u7c7b\u53ca\u5176\u5b9e\u4f8b\u7684\u64cd\u4f5c\u3002<\/p>\n

\u521b\u5efa\n\u8981\u521b\u5efa\u6570\u636e\u5e93\u884c\uff0c\u9700\u521b\u5efa\u5bf9\u5e94\u7c7b\u7684\u5b9e\u4f8b\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n>>> from PhoneNumber import PhoneNumber\n>>> myPhone = PhoneNumber(number=\u2019(415) 555-1212\u2032,\nowner=\u2019Leonard Richardson\u2019)\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n\u73b0\u5728 phone_number \u8868\u6709\u4e00\u4e2a\u5b58\u50a8\u6211\u7684\u59d3\u540d\u7684\u884c\u3002PhoneNumber \u6784\u9020\u51fd\u6570\u5c06\u8868\u5217\u7684\u503c\u4f5c\u4e3a\u5173\u952e\u5b57\u53c2\u6570\u3002\u5b83\u4f7f\u7528\u60a8\u63d0\u4f9b\u7684\u6570\u636e\u521b\u5efa\u4e00\u884c phone_number\u3002\u5982\u679c\u7531\u4e8e\u67d0\u79cd\u539f\u56e0\uff0c\u6570\u636e\u4e0d\u80fd\u8fdb\u5165\u6570\u636e\u5e93\uff0c\u5219\u6784\u9020\u51fd\u6570\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38\u3002\u5f53\u7535\u8bdd\u53f7\u7801\u65e0\u6548\u65f6\uff0c\u4f1a\u53d1\u751f\u5982\u4e0b\u60c5\u51b5\uff1a\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n>>> badPhone = PhoneNumber()\nTraceback (most recent call last):\nFile ““, line 1, in ?\n\u2026\nTypeError: PhoneNumber() did not get expected keyword argument number\n\u5982\u679c\u7535\u8bdd\u53f7\u7801\u5df2\u7ecf\u5728\u6570\u636e\u5e93\u4e2d\uff0c\u5c06\u4f1a\u770b\u5230\uff1a\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n>>> duplicatePhone = PhoneNumber(number=”(415) 555-1212”)\nTraceback (most recent call last):\nFile ““, line 1, in ?\n\u2026\nTypeError: PhoneNumber() did not get expected keyword argument owner<\/p>\n

\u8bfb\u53d6\uff08\u548c\u67e5\u8be2\uff09\nSQLObject \u7c7b\u7684\u5b9e\u4f8b\u7684\u6240\u6709\u5b57\u6bb5\u53ef\u7528\u4f5c\u6210\u5458\u3002\u8fd9\u4e0e\u5176\u4ed6\u4e00\u4e9b\u5c06\u6570\u636e\u5e93\u884c\u5f53\u4f5c\u5b57\u5178\u7684\u6570\u636e\u5e93\u6620\u5c04\u5de5\u5177\u76f8\u53cd\u3002\u56e0\u6b64\uff0c\u5bf9\u4e8e\u6570\u636e\u5e93\u884c\u4e2d\u7684\u6bcf\u4e2a\u5b57\u6bb5\uff0cPhoneNumber \u5bf9\u8c61\u90fd\u5177\u6709\u4e00\u4e2a\u6210\u5458\u3002\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n>>> myPhone.id\n1\n>>> myPhone.owner\n\u2018Leonard Richardson\u2019\n>>> myPhone.number\n\u2018(415) 555-1212\u2032\n>>> myPhone.lastCall == None\nTrue\n\u4f46\u5982\u4f55\u68c0\u7d22\u6570\u636e\u5e93\u4e2d\u5df2\u7ecf\u5b58\u5728\u7684 PhoneNumber \u5bf9\u8c61\u5462\uff1f\u9700\u8981\u5bf9\u6570\u636e\u5e93\u6267\u884c\u67e5\u8be2\u6765\u83b7\u53d6\u3002\u8fd9\u5c31\u662f SQLObject \u7684\u67e5\u8be2\u6784\u9020\u5de5\u5177\u5305\uff08\u8be5\u8f6f\u4ef6\u5305\u6700\u6709\u8da3\u7684\u7279\u6027\u4e4b\u4e00\uff09\u53d1\u6325\u4f5c\u7528\u7684\u5730\u65b9\u3002\u5b83\u5141\u8bb8\u5c06 SQL \u67e5\u8be2\u8868\u793a\u4e3a Python \u5bf9\u8c61\u94fe\u3002\u5982\u679c\u60a8\u719f\u6089 Java\u2122 \u7f16\u7a0b\u8bed\u8a00\u7684\u5bf9\u8c61\u5173\u7cfb\u5305\u7684\u8bdd\uff0c\u5b83\u4e0e\u53ef\u4ee5\u5bf9 Torque \u4e2d Criteria \u5bf9\u8c61\u6267\u884c\u7684\u64cd\u4f5c\u4e00\u6837\u3002\n\u60a8\u5b9a\u4e49\u7684\u6bcf\u4e2a SQLObject \u7c7b\u90fd\u6709\u4e00\u4e2a select() \u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u5b9a\u4e49\u67e5\u8be2\u7684\u5bf9\u8c61\uff0c\u8fd4\u56de\u4e0e\u8be5\u67e5\u8be2\u5339\u914d\u7684\u9879\u5217\u8868\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u8fd9\u4e2a\u65b9\u6cd5\u8c03\u7528\u8fd4\u56de\u5305\u542b\u6570\u636e\u5e93\u4e2d\u7b2c\u4e00\u4e2a\u7535\u8bdd\u53f7\u7801\u7684\u5217\u8868\uff1a\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n>>> PhoneNumber.select(PhoneNumber.q.id==1)\n\n>>> PhoneNumber.select(PhoneNumber.q.id==1)[0]\n\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\nPhoneNumber.q.id \u6307\u660e\u60f3\u8981\u5bf9 phone_number \u8868\u7684 id \u5b57\u6bb5\u8fd0\u884c\u67e5\u8be2\u3002SQLObject \u8fc7\u8f7d\u6bd4\u8f83\u64cd\u4f5c\u7b26\uff08==\u3001!=\u3001<\u3001>= \u7b49\u7b49\uff09\u6765\u6267\u884c\u9664\u5e03\u5c14\u8868\u8fbe\u5f0f\u4e4b\u5916\u7684\u67e5\u8be2\u3002\u8868\u8fbe\u5f0fPhoneNumber.q.id==1 \u662f\u4e0e id \u5b57\u6bb5\u503c\u4e3a 1 \u7684\u6bcf\u884c\u76f8\u5339\u914d\u7684\u67e5\u8be2\u3002\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n>>> PhoneNumber.select(PhoneNumber.q.id < 100)[0]\n\n>>> PhoneNumber.select(PhoneNumber.q.owner==\u2019Leonard Richardson\u2019).count()\n1\n>>> PhoneNumber.select(PhoneNumber.q.number.startswith(\u2018(415)\u2019)).count()\n1\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n\u53ef\u4ee5\u4f7f\u7528 SQLObject \u7684 AND \u548c OR \u51fd\u6570\u6765\u7ec4\u5408\u67e5\u8be2\u5b50\u53e5\uff1a\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n>>> from sqlobject import AND, OR\n>>> PhoneNumber.select(AND(PhoneNumber.q.number.startswith(\u2018(415)\u2019),\n>>>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 PhoneNumber.q.lastCall==None)).count()\n1\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n\u4e0b\u5217\u67e5\u8be2\u83b7\u53d6\u4e00\u5e74\u4e2d\u547c\u53eb\u8fc7\u7684\u6240\u6709\u4eba\u4ee5\u53ca\u4ece\u672a\u547c\u53eb\u8fc7\u7684\u6240\u6709\u4eba\uff1a\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n>>> import datetime\n>>> oneYearAgo = datetime.datetime.now() \u2013 datetime.timedelta(days=365)\n>>> PhoneNumber.select(OR(PhoneNumber.q.lastCall==None,\n\u2026\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 PhoneNumber.q.lastCall < oneYearAgo)).count()\n1\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-<\/p>\n

\u66f4\u65b0\n\u5982\u679c\u66f4\u6539 PhoneNumber \u5bf9\u8c61\u7684\u4e00\u4e2a\u6210\u5458\uff0c\u5219\u8be5\u66f4\u6539\u88ab\u81ea\u52a8\u955c\u50cf\u6620\u5c04\u81f3\u6570\u636e\u5e93\uff1a\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n>>> print myPhone.owner\nLeonard Richardson\n>>> print myPhone.lastCall\nNone\n>>> myPhone.owner = “Someone else”\n>>> myPhone.lastCall = datetime.datetime.now()\n>>> #Fetch the object fresh from the database.\n>>> newPhone = PhoneNumber.select(PhoneNumber.q.id==1)[0]\n>>> print newPhone.owner\nSomeone else\n>>> print newPhone.lastCall\n2005-05-22 21:20:24.630120<\/p>\n

\u6ce8\u610f\uff1aSQLObject \u4e0d\u5141\u8bb8\u66f4\u6539\u5bf9\u8c61\u7684\u4e3b\u952e\u3002\u901a\u5e38\u6700\u597d\u662f\u8ba9 SQLObject \u6765\u7ba1\u7406\u8868\u7684 id \u5b57\u6bb5\uff0c\u5373\u4f7f\u662f\u60a8\u4e0d\u4f7f\u7528 SQLObject \u65f6\u78b0\u5de7\u7528\u53e6\u4e00\u4e2a\u5b57\u6bb5\u4f5c\u4e3a\u4e3b\u952e\u3002<\/p>\n

\u5220\u9664<\/p>\n

\u5220\u9664\u7279\u5b9a\u884c\u5bf9\u8c61\u7684\u65b9\u6cd5\u662f\u5c06\u5176 ID \u4f20\u9012\u5230\u5176\u7c7b\u7684 delete() \u65b9\u6cd5\u4e2d\uff1a\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n>>> query = PhoneNumber.q.id==1\n>>> print “Before:”, PhoneNumber.select(query).count()\nBefore: 1\n>>> PhoneNumber.delete(myPhone.id)\n>>> print “After:”, PhoneNumber.select(query).count()\nAfter: 0\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-<\/p>\n

6\u3001\u9a8c\u8bc1\u548c\u8f6c\u6362\u6570\u636e\n<\/strong>SQLObject \u901a\u8fc7\u5141\u8bb8\u5b9a\u4e49\u9a8c\u8bc1\u548c\u8f6c\u6362\u5165\u7ad9\u6570\u636e\u7684\u94a9\u5b50\u65b9\u6cd5\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002\u53ef\u4ee5\u4e3a\u8868\u4e2d\u7684\u6bcf\u4e2a\u5b57\u6bb5\u5b9a\u4e49\u4e00\u4e2a\u65b9\u6cd5\u3002\u5b57\u6bb5\u7684\u94a9\u5b50\u65b9\u6cd5\u547d\u540d\u4e3a set<\/em>[field name]()\uff0c\u4e0d\u7ba1\u662f\u4f5c\u4e3a create \u64cd\u4f5c\u8fd8\u662f update \u64cd\u4f5c\u7684\u4e00\u90e8\u5206\uff0c\u6bcf\u5f53\u8981\u4e3a\u8be5\u5b57\u6bb5\u8bbe\u7f6e\u4e00\u4e2a\u503c\u65f6\uff0c\u90fd\u4f1a\u8c03\u7528\u8be5\u65b9\u6cd5\u3002\u94a9\u5b50\u65b9\u6cd5\u5e94\uff08\u53ef\u9009\uff09\u5c06\u5165\u7ad9\u503c\u8f6c\u6362\u4e3a\u53ef\u63a5\u53d7\u683c\u5f0f\uff0c\u7136\u540e\u8bbe\u7f6e\u8be5\u503c\u3002\u5426\u5219\uff0c\u5b83\u5e94\u629b\u51fa\u5f02\u5e38\u3002\u8981\u5b9e\u9645\u8bbe\u7f6e\u4e00\u4e2a\u503c\uff0c\u8be5\u65b9\u6cd5\u9700\u8981\u8c03\u7528 SQLObject \u65b9\u6cd5 _SOset<\/em>(field name)\u3002\n\u3010PhoneNumber \u7684 _set_number() \u65b9\u6cd5\u3002\u5982\u679c\u7535\u8bdd\u53f7\u7801\u5b8c\u5168\u6ca1\u6709\u683c\u5f0f\u5316\uff0c\u6bd4\u5982 4155551212\uff0c\u5219\u8be5\u65b9\u6cd5\u5c06\u8be5\u6570\u5b57\u683c\u5f0f\u5316\u4e3a (415) 555-1212\u3002\u5426\u5219\uff0c\u5982\u679c\u6570\u5b57\u683c\u5f0f\u4e0d\u6b63\u786e\uff0c\u8be5\u65b9\u6cd5\u4f1a\u629b\u51fa ValueError\u3002\u6b63\u786e\u683c\u5f0f\u5316\u7684\u7535\u8bdd\u53f7\u7801 \u2014\u2014 \u6216\u8005\u662f\u8f6c\u6362\u4e3a\u6b63\u786e\u683c\u5f0f\u7684\u7535\u8bdd\u53f7\u7801 \u2014\u2014 \u88ab\u6b63\u786e\u4f20\u9012\u7ed9 SQLObject \u7684 _SO_set_number() \u65b9\u6cd5\u3002\u3011\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\nimport re\ndef _set_number(self, value):\nif not re.match(\u2018([0-9]{3}) [0-9]{3}-[0-9]{4}\u2019, value):\n#It\u2019s not in the format we expect.\nif re.match(\u2018[0-9]{10}\u2019, value):\n#It\u2019s totally unformatted; add the formatting.\nvalue = “(%s) %s-%s” % (value[:3], value[3:6], value[6:])\nelse:\nraise ValueError, \u2018Not a phone number: %s\u2019 % value\nself._SO_set_number(value)\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-<\/p>\n

7\u3001\u5b9a\u4e49\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\n<\/strong>\u771f\u6b63\u7684\u6570\u636e\u5e93\u5e94\u7528\u7a0b\u5e8f\u901a\u5e38\u5177\u6709\u591a\u4e2a\u76f8\u5173\u8868,SQLObject \u5141\u8bb8\u5c06\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\u5b9a\u4e49\u4e3a\u5916\u952e\u3002\u4f5c\u4e3a\u6f14\u793a\uff0c\u6211\u4eec\u5c06\u4e00\u4e2a\u5c0f\u7684\u6570\u636e\u5e93\u89c4\u8303\u5316\uff08normalization\uff09\u5e94\u7528\u4e8e\u4e0a\u4e00\u793a\u4f8b\uff0c\u5c06 PhoneNumber \u7684 owner \u5b57\u6bb5\u5206\u5272\u5230\u5355\u72ec\u7684 person \u8868\u4e2d\u3002\u6e05\u5355 14 \u6240\u793a\u7684\u4ee3\u7801\u4fdd\u5b58\u5728\u540d\u4e3a PhoneNumberII.py \u7684\u6587\u4ef6\u4e2d\u3002\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\nimport sqlobject\nfrom Connection import conn\nclass PhoneNumber(sqlobject.SQLObject):\n_connection = conn\nnumber = sqlobject.StringCol(length=14, unique=True)\nowner = sqlobject.ForeignKey(\u2018Person\u2019)\nlastCall = sqlobject.DateTimeCol(default=None)<\/p>\n

class Person(sqlobject.SQLObject):\n_idName=\u2019fooID\u2019\n_connection = conn\nname = sqlobject.StringCol(length=255)\n#The SQLObject-defined name for the “owner” field of PhoneNumber\n#is “owner_id” since it\u2019s a reference to another table\u2019s primary\n#key.\nnumbers = sqlobject.MultipleJoin(\u2018PhoneNumber\u2019, joinColumn=\u2019owner_id\u2019)<\/p>\n

Person.createTable(ifNotExists=True)\nPhoneNumber.createTable(ifNotExists=True)\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-<\/p>\n

\u8be5 PhoneNumber \u7c7b\u5177\u6709\u4e0e\u65e7\u7c7b\u76f8\u540c\u7684\u6210\u5458\uff0c\u4f46\u5b83\u7684 owner \u6210\u5458\u662f\u5bf9 person \u8868\u7684\u4e3b\u952e\u7684\u5f15\u7528\uff0c\u800c\u4e0d\u662f\u5bf9 phone_number \u8868\u4e2d\u5b57\u7b26\u4e32\u5217\u7684\u5f15\u7528\u3002\u8fd9\u4f7f\u5f97\u8868\u793a\u5177\u6709\u4e24\u4e2a\u7535\u8bdd\u53f7\u7801\u7684\u4e2a\u4eba\u6210\u4e3a\u53ef\u80fd\uff1a\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n>>> from PhoneNumberII import PhoneNumber, Person\n>>> me = Person(name=\u2019Leonard Richardson\u2019)\n>>> work = PhoneNumber(number=”(650) 555-1212″, owner=me)\n>>> cell = PhoneNumber(number=”(415) 555-1212″, owner=me)\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-<\/p>\n

Person \u7684 numbers \u6210\u5458\uff0c\u4e00\u4e2a SQLObject MultipleJoin\uff0c\u4f7f\u5f97\u57fa\u4e8e person \u5230 phone_number \u7684\u8fde\u63a5\u8fdb\u884c\u67e5\u8be2\u53d8\u5f97\u5bb9\u6613\uff1a\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\n>>> for phone in me.phoneNumbers:\n\u2026\u00a0\u00a0\u00a0\u00a0 print phone.number\n\u2026\n(650) 555-1212\n(415) 555-1212\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-<\/p>\n

\u540c\u6837\uff0cSQLObject \u5141\u8bb8\u4f7f\u7528 MultipleJoin \u7c7b\u8fdb\u884c\u591a\u5bf9\u591a\u8fde\u63a5\u7684\u67e5\u8be2\u3002<\/p>\n

8\u3001\u5c06 SQLObject \u7528\u4e8e\u73b0\u6709\u8868\n<\/strong>SQLObject \u7684\u4e00\u4e2a\u5e38\u89c1\u7528\u9014\u662f\u4e3a\u53e6\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\u521b\u5efa\u7684\u6570\u636e\u5e93\u63d0\u4f9b Python \u63a5\u53e3\u3002SQLObject \u6709\u591a\u4e2a\u7279\u6027\u53ef\u7528\u4e8e\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002<\/p>\n

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SQLObject \u63d0\u4f9b\u4e86\u4e00\u4e9b\u4e0e\u5e38\u89c1\u6570\u636e\u5e93\u547d\u540d\u7ea6\u5b9a\u5bf9\u5e94\u7684 Style \u7c7b\u3002\u4f8b\u5982\uff0c\u5982\u679c\u5217\u540d\u7c7b\u4f3c likeThis \u800c\u975e like_this\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528 MixedCaseStyle\uff1a\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-\nimport sqlobject\nfrom sqlobject.styles import MixedCaseStyle\nfrom Connection import conn\nclass PhoneNumber(sqlobject.SQLObject):\n_connection = conn\n_fromDatabase = True\n_style = MixedCaseStyle\n\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-<\/p>\n

\u5982\u679c\u6ca1\u6709\u9884\u5305\u88c5\u7684 Style \u7c7b\u7b26\u5408\u60a8\u7684\u9700\u8981\uff0c\u90a3\u4e48\u60a8\u53ef\u4ee5\u5b9a\u4e49 Style \u57fa\u7c7b\u7684\u5b50\u7c7b\uff0c\u5e76\u5b9a\u4e49\u81ea\u5df1\u7684\u547d\u540d\u7ea6\u5b9a\u3002\u5728\u6700\u574f\u7684\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u8868\u7684\u5b57\u6bb5\u540d\u5206\u914d\u5f97\u6beb\u65e0\u9053\u7406\uff0c\u5219\u53ef\u4ee5\u9010\u4e2a\u547d\u540d\u6bcf\u4e2a\u5b57\u6bb5\u3002<\/p>\n

\u5173\u4e8e SQLObject \u9650\u5236\nSQLObject \u60f3\u8ba9\u60a8\u7528\u9762\u5411\u5bf9\u8c61\u7684\u65b9\u5f0f\u800c\u975e\u5173\u7cfb\u65b9\u5f0f\u8fdb\u884c\u601d\u8003\u3002\u8fd9\u6709\u5229\u4e8e\u60a8\u7684\u7406\u89e3\u548c\u60a8\u7684\u7f16\u7a0b\u751f\u4ea7\u7387\uff0c\u4f46\u4e0d\u5229\u4e8e\u6027\u80fd\u3002\u6bd5\u7adf\uff0c\u6570\u636e\u5e93\u4ecd\u662f\u5173\u7cfb\u578b\u7684\u3002\u5982\u4f55\u6807\u8bb0\u547c\u53eb\u8fc7\u7684\u6bcf\u4e2a\u7535\u8bdd\u53f7\u7801\uff1f\u4f7f\u7528 SQL\uff0c\u60a8\u5c06\u4f7f\u7528\u5355\u4e2a UPDATE \u547d\u4ee4\u3002\u4f7f\u7528 SQLObject\uff0c\u60a8\u9700\u8981\u8fed\u4ee3\u901a\u8fc7\u6574\u4e2a\u7ed3\u679c\u96c6\uff0c\u5e76\u4fee\u6539\u6bcf\u4e2a\u5bf9\u8c61\u7684 last_call \u6210\u5458\uff0c\u8fd9\u662f\u975e\u5e38\u4f4e\u6548\u7684\u3002<\/p>\n

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