Question

我遇到使用Swift 3.1插入或更新到SQLite数据库中的外国和国际字符的问题。所以，我尝试下面添加UTF8，但遇到错误“无法将类型'字符串'的值转换为预期的参数类型'OpaquePointer！' ”

我很难过，不知道该往哪里看。

func saveDiveDetails (_ dives: Dives) -> Int32 {
    let diveLog = AppDelegate.getDLDatabase()

    let diveBuddy = diveBuddyTextField.text ?? ""
    let diveMaster = diveBuddyTextField.text ?? ""
    let boatName = diveBuddyTextField.text ?? ""
    let diveCenter = diveBuddyTextField.text ?? ""
    let boatOperator = diveBuddyTextField.text ?? ""
    let city = diveBuddyTextField.text ?? ""
    let country = diveBuddyTextField.text ?? ""
    let bodyOfWater = diveBuddyTextField.text ?? ""
    let tripName = diveBuddyTextField.text ?? ""
    var statement: OpaquePointer? = nil

    let update:String = String(format: "UPDATE Dives SET dive_buddy = ?, dive_master = ?, boatName_name = ?, diveCenter_name = ?, boatOperator_name = ?, diveCity_name = ?, bodyOfWater_name = ?, diveCountry_name = ?, tripName_name = ? WHERE id = %d")

    if(sqlite3_prepare_v2(self.dlDatabase.database, update, -1, &statement, nil) == SQLITE_OK){
        sqlite3_bind_text(update, 0, diveBuddy.cString(using: String.Encoding.utf8), -1, SQLITE_TRANSIENT)
        sqlite3_bind_text(update, 1, diveMaster.cString(using: String.Encoding.utf8), -1, SQLITE_TRANSIENT)
        sqlite3_bind_text(update, 2, boatName.cString(using: String.Encoding.utf8), -1, SQLITE_TRANSIENT)
        sqlite3_bind_text(update, 3, diveCenter.cString(using: String.Encoding.utf8), -1, SQLITE_TRANSIENT)
        sqlite3_bind_text(update, 4, boatOperator.cString(using: String.Encoding.utf8), -1, SQLITE_TRANSIENT)
        sqlite3_bind_text(update, 5, city.cString(using: String.Encoding.utf8), -1, SQLITE_TRANSIENT)
        sqlite3_bind_text(update, 6, bodyOfWater.cString(using: String.Encoding.utf8), -1, SQLITE_TRANSIENT)
        sqlite3_bind_text(update, 7, country.cString(using: String.Encoding.utf8), -1, SQLITE_TRANSIENT)
        sqlite3_bind_text(update, 8, tripName.cString(using: String.Encoding.utf8), -1, SQLITE_TRANSIENT)
        sqlite3_bind_int(update, 9, self.diveNumber)
    }

    sqlite3_prepare_v2(self.dlDatabase.database, update, -1, &statement, nil)
    sqlite3_bind_int(statement, 1, Int32(self.diveNumber));
    if sqlite3_step(statement) == SQLITE_DONE {

        print("SQLite saved")
    }
    else {
        let errorMessage = String.init(validatingUTF8: sqlite3_errmsg(dlDatabase.database))!
        print("update failed! \(errorMessage)")
    }
    sqlite3_finalize(statement)
}

我每次搜索，但无法找到对此类错误的引用。

Answer 1

您不需要将Swift字符串转换为C字符串：

sqlite3_bind_text(update, 1, diveMaster, -1, SQLITE_TRANSIENT)

此外，请注意：sqlite3_bind_xxx函数接受基于1的索引：sqlite3_bind_text(update, 0, ...)无效。见https://sqlite.org/c3ref/bind_blob.html

参考：https://github.com/groue/GRDB.swift/blob/v0.106.2/GRDB/Core/Statement.swift#L162

不透明指针错误Swift 3.1

1 个答案: