We are about to create a simple app that reverses the contents of a text field.This example also introduces some new stuff that will help us out in our next example.See the API documentation for of a statement is an internal SQLAlchemy object which contains all information about the statement being executed, including its source expression, the parameters associated with it and the cursor.The typical use case for this context with regards to default generation is to have access to the other values being inserted or updated on the row.Columns that do not appear in the list of assignments are left unmodified.The scalar expressions may refer to columns of the row being updated.This is why poorly coded Java Script can freeze a web page.
Skim through to get an idea of how everything fits together. Note: You may be wondering, why bother having a record if it only holds one entry? The modifications made to each row affected by an UPDATE statement are determined by the list of assignments following the SET keyword.Each assignment specifies a to the left of the equals sign and a scalar expression to the right.An UPDATE statement is used to modify a subset of the values stored in zero or more rows of the database table identified by the qualified-table-name specified as part of the UPDATE statement.If the UPDATE statement does not have a WHERE clause, all rows in the table are modified by the UPDATE.
It finds a button, adds a click listener, and sets a timeout.