CREATE TABLE IF NOT EXISTS di_mongodb_conf_test ( `id` STRING ,`col_string` STRING ,`col_int32` INT ,`col_int32_min` INT ,`col_int32_max` INT ,`col_int64` BIGINT ,`col_int64_min` BIGINT ,`col_int64_max` BIGINT ,`col_decimal` DECIMAL(38,18) ,`col_double` DOUBLE ,`col...
packagecn.mldn.demo;importcom.mongodb.*;publicclassMongoDemoC{publicstaticvoidmain(String[]args)throws Exception{// 设置要连接的数据库的主机名与端口号MongoClient client=newMongoClient("localhost",27001);DBdb=client.getDB("mldn");// 连接数据库// 进行数据库的用户名与密码验证if(db.authehticate...
db.users.find() { “_id” : 1, “username” : “mengday1”, “age” : 26, “create_date” : ISODate(“2017-07-30T07:52:33.837Z”) } { “_id” : 2, “username” : “mengday2”, “age” : 26, “create_date” : ISODate(“2017-07-30T07:52:43.021Z”) } { “_id”...
建议使用这种写法,因为数据库已经存在的话,就是报错mysql> CREATE DATABASE IF NOT EXISTS database_name; mysql MySQL sql 【数据库系统原理】第三章 数据库设计 第一节 数据库设计概述设计者需要拥有计算机专业知识和应用业务经验。一 数据库生命周期二 数据库设计目标①满足应用功能需求②良好的数据库性能三 数...
You cannot use $size to find a range of sizes (for example: arrays with more than 1 element). If you need to query for a range, create an extra size field that you increment when you add elements. 7)$exists $exists用来判断一个元素是否存在: ...
CREATETABLEIFNOTEXISTStest_write_mongo( id STRING , col_string STRING, col_intint, col_bigintbigint, col_decimaldecimal, col_date DATETIME, col_booleanboolean, col_array string ) PARTITIONEDBY(pt STRING) LIFECYCLE10; 添加一个分区取值20230215。
1、首先需要明确MongoDB与kingbase的对应关系,collection相当于table,filed相当于字段,根据这个对应关系创建表; 此次迁移的MongoDB里的数据字段是:_id(自动生成的objectid),image(转成二进制存储的文档) 所以在金仓里创建表 create tab
db.createUser(user, writeConcern) Creates a new user for the database on which the method is run. db.createUser() returns a duplicate user error if the user already exists on the database. The db.createUser() method has the following syntax: Field Type Description user document The docum...
If it's not already displayed, clickClustersin the sidebar. TheClusterspage displays. 2 Go to theCollectionspage. Click theBrowse Collectionsbutton for your cluster. TheData Explorerdisplays. 3 Go to theIndexestab. Select the collection with the index that you want to drop. ...
The MongoDB driver supports receiving a stream context to set SSL and logging options. This can be used to authenticate using SSL certificates. To do so, create a service that creates your logging context: Note: theclassoption is not used when creating the service, but has to be provided ...