如何回收我的SqliteCommand来加速这个Sqlite批量插入(iOS)？

let database = try! Connection(databasePath)
try! database.execute("BEGIN TRANSACTION")

// 在这里执行批量插入操作

try! database.execute("COMMIT TRANSACTION")

let database = try! Connection(databasePath)
let statement = try! database.prepare("INSERT INTO myTable (column1, column2) VALUES (?, ?)")

// 在这里执行批量插入操作

statement.finalize()

let database = try! Connection(databasePath)

// 在这里执行批量插入操作

let statement = try! database.prepare("INSERT INTO myTable (column1, column2) VALUES (?, ?)")
for item in items {
    statement.bind(1, item.column1)
    statement.bind(2, item.column2)
    try! statement.step()
    statement.reset()
}

let pool = try! ConnectionPool(databasePath, maxConnections: 5)

// 在这里执行批量插入操作