sqlite

问题 So I have let's say pretty complex database which is using many to many database design with foreign keys and join tables and it's Room database. I want to create backup system for it because it's offline application I would need to export database and store it to google drive's app folder. I have read quite a lot about it in recent day's but still a bit confused I saw that there is ways to export database as CSV , JSON , excel files or just as .db file, but what are the best practices for

问题 So I have let's say pretty complex database which is using many to many database design with foreign keys and join tables and it's Room database. I want to create backup system for it because it's offline application I would need to export database and store it to google drive's app folder. I have read quite a lot about it in recent day's but still a bit confused I saw that there is ways to export database as CSV , JSON , excel files or just as .db file, but what are the best practices for

问题 I have the necessity to extract content from a text in a SQL field after a keyword. For example if i have a field called description in a table, and the table content for that field is: Description asdasf keyword dog aeee keyword cat ffffaa keyword wolf I want to extract and save the text after "keyword " (in this case dog,cat and wolf) and save it in a view or simply show it with a select. Thank you. 回答1: Here is an example using SUBSTRING() : SELECT SUBSTRING(YourField, CHARINDEX(Keyword

问题 I have the necessity to extract content from a text in a SQL field after a keyword. For example if i have a field called description in a table, and the table content for that field is: Description asdasf keyword dog aeee keyword cat ffffaa keyword wolf I want to extract and save the text after "keyword " (in this case dog,cat and wolf) and save it in a view or simply show it with a select. Thank you. 回答1: Here is an example using SUBSTRING() : SELECT SUBSTRING(YourField, CHARINDEX(Keyword

问题 I have the necessity to extract content from a text in a SQL field after a keyword. For example if i have a field called description in a table, and the table content for that field is: Description asdasf keyword dog aeee keyword cat ffffaa keyword wolf I want to extract and save the text after "keyword " (in this case dog,cat and wolf) and save it in a view or simply show it with a select. Thank you. 回答1: Here is an example using SUBSTRING() : SELECT SUBSTRING(YourField, CHARINDEX(Keyword

问题 FROM golang:1.8 ADD . /go/src/beginnerapp RUN go get -u github.com/gorilla/mux RUN go get github.com/mattn/go-sqlite3 RUN go install beginnerapp/ VOLUME /go/src/beginnerapp/local-db WORKDIR /go/src/beginnerapp ENTRYPOINT /go/bin/beginnerapp EXPOSE 8080 The sqlite db file is in the local-db directory but I don't seem to be using the VOLUME command correctly. Any ideas how I can have db changes to the sqlite db file persisted? I don't mind if the volume is mounted before or after the build. I

问题 I know that sqlite does not support Boolean and we need to use int columns to mimic the behavior of Boolean . But does Room support Boolean ? What if have a Boolean in my entity ? Will it work as expected? 回答1: Yes it does. When you store boolean using room, it automatically stores 1 for true and 0 for false . And same case while reading. It converts 1 or 0 to true/ false respectively. 来源： https://stackoverflow.com/questions/51130777/does-room-database-support-boolean-variables-in-entity

问题 I know that sqlite does not support Boolean and we need to use int columns to mimic the behavior of Boolean . But does Room support Boolean ? What if have a Boolean in my entity ? Will it work as expected? 回答1: Yes it does. When you store boolean using room, it automatically stores 1 for true and 0 for false . And same case while reading. It converts 1 or 0 to true/ false respectively. 来源： https://stackoverflow.com/questions/51130777/does-room-database-support-boolean-variables-in-entity

问题 I know that sqlite does not support Boolean and we need to use int columns to mimic the behavior of Boolean . But does Room support Boolean ? What if have a Boolean in my entity ? Will it work as expected? 回答1: Yes it does. When you store boolean using room, it automatically stores 1 for true and 0 for false . And same case while reading. It converts 1 or 0 to true/ false respectively. 来源： https://stackoverflow.com/questions/51130777/does-room-database-support-boolean-variables-in-entity

问题 I cannot get my head around it. I want to insert the values of a dictionary into a sqlite databse. url = "https://api.flickr.com/services/rest/?method=flickr.photos.search&api_key=5f...1b&per_page=250&accuracy=1&has_geo=1&extras=geo,tags,views,description" soup = BeautifulSoup(urlopen(url)) #soup it up for data in soup.find_all('photo'): #parsing the data dict = { #filter the data, find_all creats dictionary KEY:VALUE "id_p": data.get('id'), "title_p": data.get('title'), "tags_p": data.get(