% Add jar file to classpath (ensure it is present in your current dir)
javaclasspath('postgresql-9.0-801.jdbc4.jar');
 
% Username and password you chose when installing postgres
props=java.util.Properties;
props.setProperty('user','<your_postgres_username>');
props.setProperty('password','<your_postgres_password>');
 
% Create the database connection (port 5432 is the default postgres chooses
% on installation)
driver=org.postgresql.Driver;
url = 'jdbc:postgresql://<yourhost>:<yourport>\<yourdb>';
conn=driver.connect(url,props);
 
% A test query
sql='select * from <table>'; % Gets all records
ps=conn.prepareStatement(sql);
rs=ps.executeQuery();
 
% Read the results into an array of result structs
count=0;
result=struct;
while rs.next()
    count=count+1;
    result(count).var1=char(rs.getString(2));
    result(count).var2=char(rs.getString(3));
    ...
end