readall
Read all data in DatabaseDatastore
Syntax
Description
Examples
Create a database connection using a JDBC driver. To create this connection, you must configure a JDBC data source. For more information, see the function. Then, create a configureJDBCDataSourceDatabaseDatastore object and read all data stored in the object.
Create a database connection to the JDBC data source MSSQLServerJDBCAuth. This data source configures a JDBC driver to a Microsoft® SQL Server® database with Windows® authentication. Specify a blank user name and password.
datasource = "MSSQLServerJDBCAuth"; username = ""; password = ""; conn = database(datasource,username,password);
Create a DatabaseDatastore object using the database connection and an SQL query. This SQL query reads all data from the airlinesmall table.
sqlquery = 'select * from airlinesmall';
dbds = databaseDatastore(conn,sqlquery);
Read all data in the DatabaseDatastore object.
data = readall(dbds);
data contains the query results.
Display the first three rows of query results.
data(1:3,:)
ans =
3×29 table
Year Month DayofMonth DayOfWeek DepTime CRSDepTime ArrTime CRSArrTime UniqueCarrier FlightNum TailNum ActualElapsedTime CRSElapsedTime AirTime ArrDelay DepDelay Origin Dest Distance TaxiIn TaxiOut Cancelled CancellationCode Diverted CarrierDelay WeatherDelay NASDelay SecurityDelay LateAircraftDelay
____ _____ __________ _________ _______ __________ _______ __________ _____________ _________ _______ _________________ ______________ _______ ________ ________ ______ _____ ________ ______ _______ _________ ________________ ________ ____________ ____________ ________ _____________ _________________
1987 10 28 3 1140 1140 1212 1215 'US' 262 'NA' 32 35 'NA' -3 0 'CLE' 'PIT' 105 'NA' 'NA' 0 'NA' 0 'NA' 'NA' 'NA' 'NA' 'NA'
1987 10 9 5 1155 1155 1250 1300 'US' 282 'NA' 55 65 'NA' -10 0 'ROC' 'LGA' 254 'NA' 'NA' 0 'NA' 0 'NA' 'NA' 'NA' 'NA' 'NA'
1987 10 22 4 715 715 807 803 'US' 304 'NA' 52 48 'NA' 4 0 'DTW' 'PIT' 201 'NA' 'NA' 0 'NA' 0 'NA' 'NA' 'NA' 'NA' 'NA'
Close the DatabaseDatastore object and the database connection.
close(dbds)
Input Arguments
Datastore containing data in a database, specified as a DatabaseDatastore object
created using the databaseDatastore function.
Output Arguments
Query results, returned as a table of the records in the data
set. Executing the SQL statement specified in the Query property
of the DatabaseDatastore object creates the data
set.
Version History
Introduced in R2014b
MATLAB Command
You clicked a link that corresponds to this MATLAB command:
Run the command by entering it in the MATLAB Command Window. Web browsers do not support MATLAB commands.
웹사이트 선택
번역된 콘텐츠를 보고 지역별 이벤트와 혜택을 살펴보려면 웹사이트를 선택하십시오. 현재 계신 지역에 따라 다음 웹사이트를 권장합니다:
또한 다음 목록에서 웹사이트를 선택하실 수도 있습니다.
사이트 성능 최적화 방법
최고의 사이트 성능을 위해 중국 사이트(중국어 또는 영어)를 선택하십시오. 현재 계신 지역에서는 다른 국가의 MathWorks 사이트 방문이 최적화되지 않았습니다.
미주
- América Latina (Español)
- Canada (English)
- United States (English)
유럽
- Belgium (English)
- Denmark (English)
- Deutschland (Deutsch)
- España (Español)
- Finland (English)
- France (Français)
- Ireland (English)
- Italia (Italiano)
- Luxembourg (English)
- Netherlands (English)
- Norway (English)
- Österreich (Deutsch)
- Portugal (English)
- Sweden (English)
- Switzerland
- United Kingdom (English)