Repository: stephencelis/SQLite.swift (swift)

Issue:
Is there a “VACUUM” function to reduce file size?
I delete a lot of data when adding new one to my database to keep the file size low. But as the deleted rows remain in the memory the file size doesn’t reduce. Is there a supported vacuum function?

Pull request description:
Fixes #1047 

Usage:
```swift
try connection.vacuum()
```

Patch:
diff --git a/Sources/SQLite/Core/Connection.swift b/Sources/SQLite/Core/Connection.swift
index f4a9e8cb..8fd07cc1 100644
--- a/Sources/SQLite/Core/Connection.swift
+++ b/Sources/SQLite/Core/Connection.swift
@@ -252,6 +252,17 @@ public final class Connection {
     @discardableResult public func run(_ statement: String, _ bindings: [String: Binding?]) throws -> Statement {
         return try prepare(statement).run(bindings)
     }
+    
+    // MARK: - VACUUM
+    
+    /// Run a vacuum on the database
+    ///
+    /// - Throws: `Result.Error` if query execution fails.
+    ///
+    /// - Returns: The statement.
+    @discardableResult public func vacuum() throws -> Statement {
+        return try run("VACUUM")
+    }
 
     // MARK: - Scalar
 


Test patch:
diff --git a/Tests/SQLiteTests/ConnectionTests.swift b/Tests/SQLiteTests/ConnectionTests.swift
index fdfc9637..a05cceb5 100644
--- a/Tests/SQLiteTests/ConnectionTests.swift
+++ b/Tests/SQLiteTests/ConnectionTests.swift
@@ -111,6 +111,10 @@ class ConnectionTests : SQLiteTestCase {
         try! db.run("SELECT * FROM users WHERE admin = $admin", ["$admin": 0])
         AssertSQL("SELECT * FROM users WHERE admin = 0", 4)
     }
+    
+    func test_vacuum() {
+        try! db.vacuum()
+    }
 
     func test_scalar_preparesRunsAndReturnsScalarValues() {
         XCTAssertEqual(0, try! db.scalar("SELECT count(*) FROM users WHERE admin = 0") as? Int64)