{"id":105,"date":"2020-07-15T10:27:01","date_gmt":"2020-07-15T02:27:01","guid":{"rendered":"http:\/\/www.bigqq.com\/?p=105"},"modified":"2020-07-15T10:27:01","modified_gmt":"2020-07-15T02:27:01","slug":"mongodb","status":"publish","type":"post","link":"http:\/\/www.bigqq.com\/?p=105","title":{"rendered":"MongoDB"},"content":{"rendered":"\n

use DATABASE_NAME \/\/\u521b\u5efa\/\u4f7f\u7528\u6570\u636e\u5e93<\/p>\n\n\n\n

db.dropDatabase()\/\/\u5220\u9664\u6570\u636e\u5e93<\/p>\n\n\n\n

db.collection.drop()\/\/\u5220\u9664\u96c6\u5408<\/p>\n\n\n\n

db.createCollection(name, options)\/\/\u521b\u5efa\u96c6\u5408<\/p>\n\n\n\n

\u4e0b\u9762\u662f\u5e26\u6709\u51e0\u4e2a\u5173\u952e\u53c2\u6570\u7684 createCollection() \u7684\u7528\u6cd5\uff1a<\/p>\n\n\n\n

\u521b\u5efa\u56fa\u5b9a\u96c6\u5408 mycol\uff0c\u6574\u4e2a\u96c6\u5408\u7a7a\u95f4\u5927\u5c0f 6142800 KB, \u6587\u6863\u6700\u5927\u4e2a\u6570\u4e3a 10000 \u4e2a\u3002<\/em><\/p>\n\n\n\n

> db.createCollection(\"mycol\", { capped : true, autoIndexId : true, size : \n   6142800, max : 10000 } )<\/pre>\n\n\n\n
 \u5728 MongoDB \u4e2d\uff0c\u4f60\u4e0d\u9700\u8981\u521b\u5efa\u96c6\u5408\u3002\u5f53\u4f60\u63d2\u5165\u4e00\u4e9b\u6587\u6863\u65f6\uff0cMongoDB \u4f1a\u81ea\u52a8\u521b\u5efa\u96c6\u5408\u3002 <\/p>\n\n\n\n
\n
\u6587\u6863\u7684\u6570\u636e\u7ed3\u6784\u548c JSON \u57fa\u672c\u4e00\u6837\u3002<\/p>\n\n\n\n
\u6240\u6709\u5b58\u50a8\u5728\u96c6\u5408\u4e2d\u7684\u6570\u636e\u90fd\u662f BSON \u683c\u5f0f\u3002<\/p>\n\n\n\n
BSON \u662f\u4e00\u79cd\u7c7b\u4f3c JSON \u7684\u4e8c\u8fdb\u5236\u5f62\u5f0f\u7684\u5b58\u50a8\u683c\u5f0f\uff0c\u662f Binary JSON \u7684\u7b80\u79f0\u3002<\/p>\n<\/div><\/div>\n\n\n\n
MongoDB \u4f7f\u7528 insert() \u6216 save() \u65b9\u6cd5\u5411\u96c6\u5408\u4e2d\u63d2\u5165\u6587\u6863\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
db.COLLECTION_NAME.insert(document)\n\u6216\ndb.COLLECTION_NAME.save(document)<\/pre>\n\n\n\n
  • save()\uff1a\u5982\u679c _id \u4e3b\u952e\u5b58\u5728\u5219\u66f4\u65b0\u6570\u636e\uff0c\u5982\u679c\u4e0d\u5b58\u5728\u5c31\u63d2\u5165\u6570\u636e\u3002\u8be5\u65b9\u6cd5\u65b0\u7248\u672c\u4e2d\u5df2\u5e9f\u5f03\uff0c\u53ef\u4ee5\u4f7f\u7528 db.collection.insertOne()<\/strong> \u6216 db.collection.replaceOne()<\/strong> \u6765\u4ee3\u66ff\u3002<\/li>
  • insert(): \u82e5\u63d2\u5165\u7684\u6570\u636e\u4e3b\u952e\u5df2\u7ecf\u5b58\u5728\uff0c\u5219\u4f1a\u629b org.springframework.dao.DuplicateKeyException<\/strong> \u5f02\u5e38\uff0c\u63d0\u793a\u4e3b\u952e\u91cd\u590d\uff0c\u4e0d\u4fdd\u5b58\u5f53\u524d\u6570\u636e\u3002<\/li><\/ul>\n\n\n\n
    3.2 \u7248\u672c\u4e4b\u540e\u65b0\u589e\u4e86 db.collection.insertOne() \u548c db.collection.insertMany()\u3002<\/strong><\/p>\n\n\n\n
    db.collection.insertOne() \u7528\u4e8e\u5411\u96c6\u5408\u63d2\u5165\u4e00\u4e2a\u65b0\u6587\u6863\uff0c\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n
    \u53ea\u66f4\u65b0\u7b2c\u4e00\u6761\u8bb0\u5f55\uff1adb.col.update( { “count” : { $gt : 1 } } , { $set : { “test2” : “OK”} } );<\/p>\n\n\n\n
    \u5168\u90e8\u66f4\u65b0\uff1adb.col.update( { “count” : { $gt : 3 } } , { $set : { “test2” : “OK”} },false,true );<\/p>\n\n\n\n
    \u53ea\u6dfb\u52a0\u7b2c\u4e00\u6761\uff1adb.col.update( { “count” : { $gt : 4 } } , { $set : { “test5” : “OK”} },true,false );<\/p>\n\n\n\n
    \u5168\u90e8\u6dfb\u52a0\u8fdb\u53bb:db.col.update( { “count” : { $gt : 5 } } , { $set : { “test5” : “OK”} },true,true );<\/p>\n\n\n\n
    \u5168\u90e8\u66f4\u65b0\uff1adb.col.update( { “count” : { $gt : 15 } } , { $inc : { “count” : 1} },false,true );<\/p>\n\n\n\n
    \u53ea\u66f4\u65b0\u7b2c\u4e00\u6761\u8bb0\u5f55\uff1adb.col.update( { “count” : { $gt : 10 } } , { $inc : { “count” : 1} },false,false ); <\/p>\n\n\n\n
    \u64cd\u4f5c<\/th>\u683c\u5f0f<\/th>\u8303\u4f8b<\/th>RDBMS\u4e2d\u7684\u7c7b\u4f3c\u8bed\u53e5<\/th><\/tr><\/thead>
    \u7b49\u4e8e<\/td>{<key>:<value><\/code>}<\/td>db.col.find({\"by\":\"\u83dc\u9e1f\u6559\u7a0b\"}).pretty()<\/code><\/td>where by = '\u83dc\u9e1f\u6559\u7a0b'<\/code><\/td><\/tr>
    \u5c0f\u4e8e<\/td>{<key>:{$lt:<value>}}<\/code><\/td>db.col.find({\"likes\":{$lt:50}}).pretty()<\/code><\/td>where likes < 50<\/code><\/td><\/tr>
    \u5c0f\u4e8e\u6216\u7b49\u4e8e<\/td>{<key>:{$lte:<value>}}<\/code><\/td>db.col.find({\"likes\":{$lte:50}}).pretty()<\/code><\/td>where likes <= 50<\/code><\/td><\/tr>
    \u5927\u4e8e<\/td>{<key>:{$gt:<value>}}<\/code><\/td>db.col.find({\"likes\":{$gt:50}}).pretty()<\/code><\/td>where likes > 50<\/code><\/td><\/tr>
    \u5927\u4e8e\u6216\u7b49\u4e8e<\/td>{<key>:{$gte:<value>}}<\/code><\/td>db.col.find({\"likes\":{$gte:50}}).pretty()<\/code><\/td>where likes >= 50<\/code><\/td><\/tr>
    \u4e0d\u7b49\u4e8e<\/td>{<key>:{$ne:<value>}}<\/code><\/td>db.col.find({\"likes\":{$ne:50}}).pretty()<\/code><\/td>where likes != 50<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \u4ee5\u4e0b\u5b9e\u4f8b\u6f14\u793a\u4e86 AND \u548c OR \u8054\u5408\u4f7f\u7528\uff0c\u7c7b\u4f3c\u5e38\u89c4 SQL \u8bed\u53e5\u4e3a\uff1a ‘where likes>50 AND (by = ‘\u83dc\u9e1f\u6559\u7a0b’ OR title = ‘MongoDB \u6559\u7a0b’)’<\/strong><\/p>\n\n\n\n
    >db.col.find({\"likes\": {$gt:50}, $or: [{\"by\": \"\u83dc\u9e1f\u6559\u7a0b\"},{\"title\": \"MongoDB \u6559\u7a0b\"}]}).pretty()<\/pre>\n\n\n\n
    db.COLLECTION_NAME.find().sort({KEY:1})\/\/\u6392\u5e8f<\/p>\n\n\n\n
    db.COLLECTION_NAME.find().limit(NUMBER)\/\/top<\/p>\n","protected":false},"excerpt":{"rendered":"
    use DATABASE_NAME \/\/ […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.bigqq.com\/index.php?rest_route=\/wp\/v2\/posts\/105"}],"collection":[{"href":"http:\/\/www.bigqq.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.bigqq.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.bigqq.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.bigqq.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=105"}],"version-history":[{"count":1,"href":"http:\/\/www.bigqq.com\/index.php?rest_route=\/wp\/v2\/posts\/105\/revisions"}],"predecessor-version":[{"id":106,"href":"http:\/\/www.bigqq.com\/index.php?rest_route=\/wp\/v2\/posts\/105\/revisions\/106"}],"wp:attachment":[{"href":"http:\/\/www.bigqq.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=105"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.bigqq.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=105"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.bigqq.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=105"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}