Swift版的SQLite帮助类

SQLiteHelper

创建SQLiteHelper类

///  SQLite数据库处理帮助类//////  此类中封装了关于SQLite数据库处理的业务函数class SQLiteHelper{    // 业务代码...}

单例

private static let instance = SQLiteHelper()/// 单例  全局的数据访问接口class var sharedInstance: SQLiteHelper{    return instance}

全局变量

var db: COpaquePointer = nil

打开数据库

///  打开数据库//////  :param: dbName 数据库名称//////  :returns: 返回 是否打开成功func openDatabase(dbName: String) -> Bool{    let path = dbName.documentPath()    println(path)    return sqlite3_open(path, &db) == SQLITE_OK}

创建示例数据表

///  创建 T_Department 和 T_Employee 表//////  :returns: 返回 是否创建成功func createTable() -> Bool{    let sql = "CREATE TABLE \n" +        "IF NOT EXISTS T_Department (\n" +        "id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,\n" +        "DepartmentNo CHAR(10) NOT NULL DEFAULT '',\n" +        "Name CHAR(50) NOT NULL DEFAULT '' \n" +        "); \n" +        "CREATE TABLE IF NOT EXISTS T_Employee ( \n" +        "'id' INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, \n" +        "'name' TEXT NOT NULL, \n" +        "'age' INTEGER NOT NULL, \n" +        "'department_id' INTEGER, \n" +        "CONSTRAINT 'FK_DEP_ID' FOREIGN KEY ('department_id') REFERENCES 'T_Department' ('id') \n" +    ");"    // 返回结果    return execSql(sql)}

执行INSERT、UPDATE、DELETE 语句

///  执行INSERT、UPDATE、DELETE SQL语句//////  :param: sql SQL语句//////  :returns: 返回 是否执行成功func execSql(sql: String) -> Bool{    // 返回结果   return sqlite3_exec(db, sql.cStringUsingEncoding(NSUTF8StringEncoding)!, nil, nil, nil) == ITE_OK}

执行SQL语句 返回结果数量

///  执行SQL语句 返回结果数量//////  :param: sql SQL语句//////  :returns: 返回 结果func execCount(sql: String) -> Int{    let record = execRecordSet(sql)    // 返回结果    return (record[0] as! [AnyObject])[0] as! Int}

执行返回单条记录

///  执行返回单条记录//////  :param: sql SQL语句//////  :returns: 返回 单条记录func execRow(sql: String) -> [AnyObject]?{    let record = execRecordSet(sql)    if record.count > 0    {        return (record[0] as! [AnyObject])    }    else    {        return nil    }}

执行 SQL 返回结果集合

///  执行 SQL 返回结果集合//////  :param: sql SQL语句//////  :returns: 返回 查询的结果集func execRecordSet(sql: String) -> [AnyObject]{    var stmt: COpaquePointer = nil    var recordList = [AnyObject]()    if sqlite3_prepare_v2(db, sql.cStringUsingEncoding(NSUTF8StringEncoding)!, -1, &stmt, nil) == TE_OK    {        while sqlite3_step(stmt) == SQLITE_ROW        {            recordList.append(singleData(stmt)!)        }    }    // 释放语句    sqlite3_finalize(stmt)    // 返回结果    return recordList}

执行一行数据

///  执行一行数据//////  :param: stmt 执行的语句//////  :returns: 返回一行数据数组func singleData(stmt: COpaquePointer) -> [AnyObject]?{    var result = [AnyObject]()    // 返回该表的列数    let count = sqlite3_column_count(stmt)    //        #define SQLITE_INTEGER  1    //        #define SQLITE_FLOAT    2    //        #define SQLITE_BLOB     4    //        #define SQLITE_NULL     5    //        #ifdef SQLITE_TEXT    //        # undef SQLITE_TEXT    //        #else    //        # define SQLITE_TEXT     3    //        #endif    //        #define SQLITE3_TEXT     3    for index in 0..<count    {        let type = sqlite3_column_type(stmt, index)        // 根据字段的类型，提取对应列的值        switch type {        case SQLITE_INTEGER:            result.append(Int(sqlite3_column_int64(stmt, index)))        case SQLITE_FLOAT:            result.append(sqlite3_column_double(stmt, index))        case SQLITE_NULL:            result.append(NSNull())        case SQLITE_TEXT:            let rrrrr: UnsafePointer<UInt8> = sqlite3_column_text(stmt, index)            let chars = UnsafePointer<CChar>(sqlite3_column_text(stmt, index))            let str = String(CString: chars, encoding: NSUTF8StringEncoding)!            result.append(str)        case let type:            println("不支持的类型 \(type)")        }    }    // 返回结果    return result}