Integer的默认初始值是null,而int的初始值是int 也就是说Integer能够区分出未赋值和值为0的区别,而int却不能表达出未赋值的情况,所以int不适合作为web层的表单数据填写。(例如:一个学生参加考试且成绩为0,和没参加考试成绩为null) Integer是类,自带很多方法供使用,而int只能做一些基本的±*/=的操作 Integer变量...
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NSInteger status=sqlite3_open_v2([self databasePath],&_pDB,SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE,NULL);/* sqlite3_open_v2(const char *filename, sqlite3 **ppDb, int flags, const char *zVfs) 参数说明: filename:需要被打开的数据库文件的文件名,在sqlite3_open和sqlite3_open_v2中这个参数...
1constchar*sqlSentence ="SELECT name, age FROM t_person WHERE age < 30;";//SQL语句2sqlite3_stmt *stmt = NULL;//stmt语句句柄34//进行查询前的准备工作——检查语句合法性5//-1代表系统会自动计算SQL语句的长度6intresult = sqlite3_prepare_v2(sql, sqlSentence, -1, &stmt, NULL);78if(resul...
id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, name CHAR (50) UNIQUE NOT NULL, age INTEGER );)"; //QSqlQuery构造前,需要db已打开并连接 //未指定db或者db无效时使用默认连接进行操作 QSqlQuery query; if(query.exec(sql)){ qDebug()<<"init table success"; ...
.< colCount { let type = sqlite3_column_type(stmt, i) var value: Optional<SQLiteDataType> = NSNull() switch type{ case SQLITE_INTEGER: value = sqlite3_column_int(stmt, i) case SQLITE_TEXT: let tmpValue = sqlite3_column_text(stmt, i) value = String.init(cString: tmpValue!) ...
* update to SQLite 3.6.20 * SQLStatistics() now reports INTEGER PRIMARY KEY as first index * SQL_ATTR_MAX_ROWS for SQLite3 driver * fixed memory leaks in SQLPrimaryKeys() * try to detect last argument of SQLSetStmtOption() needed for newer unixODBC versions ...
char const *SelectStatements::tableName = "t"; Column<ColumnTypes::Integer> int1{"field1"}; Column<ColumnTypes::Integer> int2{"field2"}; Column<ColumnTypes::Text> text{"textfield"}; auto db = Storage::inMemory(); makeCreateStatement(db, tableName, int1, int2, text).execute(); ...
IDINTEGER, BookNameVARCHAR(50), PriceDOUBLE, RowguidVARCHAR(70), PRIMARYKEY(ID) ) 然后点 Run SQL 即可完成建库工作。 在SQLite Manager 点 Database -> Close Database, 关闭数据库并退出 SQLite Manager. 3. 新建 C# Project, 引用 sqlite
name="dataRow">Data row. /// <returns>Integer result code</returns> public static int ExecuteNonQueryTypedParams(IDbCommand command, DataRow dataRow) { int retVal = 0; // If the row has values, the store procedure parameters must be initialized if (dataRow != null && dataRow.ItemArray....