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
}