You want to select data from a database
With version 0.3, databases are defined like this:
db = web.database(dbn='postgres', db='mydata', user='dbuser', pw='')
Once the database is defined as such, performing selects can be performed like this:
# Select all entries from table 'mytable' entries = db.select('mytable')
The select statement takes the following keyword arguments:
The vars variable is used to populate the rest of the statements. For example:
myvar = dict(name="Bob") results = db.select('mytable', myvar, where="name = $name")
The what variable defaults to *, but can take a list of items you want selected if the entire entry isn't desired.
results = db.select('mytable', what="id,name")
The where variable lets you pass where clauses to the SQL select, such as:
results = db.select('mytable', where="id>100")
The order variable lets the order be specified. For instance:
results = db.select('mytable', order="post_date DESC")
Grouping lets you combine things that are common.
results = db.select('mytable', group="color")
Limits set how many results are returned.
results = db.select('mytable', limit=10)
Offsets start returning results after a certain point; they're often used with limits to do something like show 10 entries per page, and then see the next 10.
results = db.select('mytable', offset=10)
The _test variable lets you see the SQL produced by the statement:
results = db.select('mytable', offset=10, _test=True) <sql: 'SELECT * FROM mytable OFFSET 10'>