Commit 44452ad

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Document error handling

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`@@ -650,6 +650,20 @@ follow similar patterns.`
`650`	`650`	`> // INSERT INTO "timestamps" DEFAULT VALUES`
`651`	`651`	> ```
`652`	`652`
	`653`	`+### Handling specific SQLite errors`
	`654`	`+`
	`655`	`+You can pattern match on the error to selectively catch SQLite errors:`
	`656`	`+`
	`657`	+```swift
	`658`	`+do {`
	`659`	`+ try db.run(users.insert(email <- "alice@mac.com"))`
	`660`	`+ try db.run(users.insert(email <- "alice@mac.com"))`
	`661`	`+} catch let Result.error(_, code, _) where code == SQLITE_CONSTRAINT {`
	`662`	`+ print("constraint failed")`
	`663`	`+} catch let error {`
	`664`	`+ print("insertion failed: \(error)")`
	`665`	`+}`
	`666`	+```
`653`	`667`
`654`	`668`	`### Setters`
`655`	`669`

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Original file line number	Diff line number	Diff line change
`@@ -518,4 +518,16 @@ class QueryIntegrationTests : SQLiteTestCase {`
`518`	`518`	`}`
`519`	`519`	`}`
`520`	`520`	`}`
	`521`	`+`
	`522`	`+ func test_catchConstraintError() {`
	`523`	`+ try! db.run(users.insert(email <- "alice@example.com"))`
	`524`	`+ do {`
	`525`	`+ try db.run(users.insert(email <- "alice@example.com"))`
	`526`	`+ XCTFail("expected error")`
	`527`	`+ } catch let Result.error(_, code, _) where code == SQLITE_CONSTRAINT {`
	`528`	`+ // expected`
	`529`	`+ } catch let error {`
	`530`	`+ XCTFail("unexpected error: \(error)")`
	`531`	`+ }`
	`532`	`+ }`
`521`	`533`	`}`

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