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The following examples assume we have:. Returned sequence objects must have the same number of items as the composite result type has fields. The item with index 0 is assigned to the first field of the composite type, 1 to the second and so on. To return a SQL null for any column, insert None at the corresponding position. When an array of composite types is returned, it cannot be returned as a list, because it is ambiguous whether the Python list represents a composite type, or another array dimension.

The value for each result type column is retrieved from the mapping with the column name as key. Missing keys are treated as errors. To return a SQL null value for any column, insert None with the corresponding column name as the key.

There are several ways to achieve this because the returned object is internally turned into an iterator. The following examples assume we have composite type:. If you see anything in the documentation that is not correct, does not match your experience with the particular feature or requires further clarification, please use this form to report a documentation issue.

Development Versions: devel. Unsupported versions: 9. Data Values Prev Up Chapter Data Values. Data Type Mapping Active Oldest Votes. Try with 1.

Improve this answer. To get the result you want, try 1. It's enough to. Ashot Khachatryan Ashot Khachatryan 1, 1 1 gold badge 13 13 silver badges 24 24 bronze badges. Explanation needed. Also it's enough to cast only one side, the other will be implicitly cast. Also, don't use C-style casts. Here is an example:. If the loop is terminated by an EXIT statement, the last assigned row value is still accessible after the loop.

This is like the previous form, except that the source query is specified as a string expression, which is evaluated and replanned on each entry to the FOR loop. This allows the programmer to choose the speed of a preplanned query or the flexibility of a dynamic query, just as with a plain EXECUTE statement.

Another way to specify the query whose results should be iterated through is to declare it as a cursor. This is described in Section In general, FOREACH is meant for looping through components of a composite-valued expression; variants for looping through composites besides arrays may be added in future.

The target variable is assigned each element value in sequence, and the loop body is executed for each element. Here is an example of looping through the elements of an integer array:. The elements are visited in storage order, regardless of the number of array dimensions. Although the target is usually just a single variable, it can be a list of variables when looping through an array of composite values records.

In that case, for each array element, the variables are assigned from successive columns of the composite value. The target variable must be an array, and it receives successive slices of the array value, where each slice is of the number of dimensions specified by SLICE. Here is an example of iterating through one-dimensional slices:. If no error occurs, this form of block simply executes all the statements , and then control passes to the next statement after END.

The list is searched for the first condition matching the error that occurred. The condition names can be any of those shown in Appendix A. A category name matches any error within its category. It is possible, but often unwise, to trap those two error types by name. Condition names are not case-sensitive. As an example, consider this fragment:.

Example It might also misbehave if there is more than one unique index on the table, since it will retry the operation regardless of which index caused the error. More safety could be had by using the features discussed next to check that the trapped error was the one expected. Exception handlers frequently need to identify the specific error that occurred. These variables are undefined outside exception handlers.

The some method executes the callbackFn function once for each element present in the array until it finds the one where callbackFn returns a truthy value a value that becomes true when converted to a Boolean. If such an element is found, some immediately returns true. Otherwise, some returns false. It is not invoked for indexes which have been deleted or which have never been assigned values.

If a thisArg parameter is provided to some , it will be used as the callback's this value. Otherwise, the value undefined will be used as its this value.