Insert Data into SQLite Database Table

This example shows how to import data from an SQLite database into MATLAB® using the MATLAB interface to SQLite, perform calculations on the data, and export the results to a database table.

The example assumes that you connect to an SQLite database that contains tables named salesVolume and yearlySales. The salesVolume table contains the column names for each month. The yearlySales table contains the column names Month and SalesTotal.

Create SQLite Connection

Create the SQLite connection conn to the existing SQLite database file tutorial.db. The SQLite connection is an sqlite object.

dbfile = "tutorial.db";
conn = sqlite(dbfile);

Calculate Sum of Sales Volume for One Month

Import sales volume data for the month of March using the database connection. The salesVolume database table contains sales volume data.

tablename = "salesVolume"; 
data = sqlread(conn,tablename); 

Display the first three rows of sales volume data. The fourth variable contains the data for the month of March.

head(data(:,4),3) 

    March
    _____

     981 
    1414 
     890 

Calculate the sum of the March sales. Assign the result to the MATLAB workspace variable total and display the result.

total = sum(data.March) 

total = 
27609

Insert Total Sales for One Month into Database

Retrieve the name of the month from the sales volume data.

month = data.Properties.VariableNames(4);

Define the names of the columns for the data to insert as a string array.

colnames = ["Month" "SalesTotal"]; 

Create a MATLAB table that stores the data to export.

results = table(month,total,'VariableNames',colnames); 

Determine the status of the AutoCommit database flag. This status shows whether or not the insert action can be undone.

conn.AutoCommit 

ans = 
'on'

The AutoCommit flag is set to on. The database commits the exported data automatically to the database, and this action cannot be undone.

Insert the sum of sales for the month of March into the yearlySales table.

tablename = "yearlySales"; 
sqlwrite(conn,tablename,results) 

Import the data from the yearlySales table. This data contains the calculated result.

data = sqlread(conn,tablename) 

data=1×2 table
     Month     SalesTotal
    _______    __________

    "March"      27609   

Close Database Connection

close(conn)