访问数据库前必须先和数据库建立连接,Qt 里用QSqlDatabase表示一个数据库的连接(有点不习惯,既然表示的是连接,有没有觉得如果叫 QSqlConnection 会更好?可惜 Qt 不是我们设计的!),每个连接都有自己的名字 connectionName,用同一个 connectionName 得取的 QSqlDatabase 对象都是表示同一个连接。有一点需要注意,...
访问数据库前必须先和数据库建立连接,Qt 里用QSqlDatabase表示一个数据库的连接(有点不习惯,既然表示的是连接,有没有觉得如果叫 QSqlConnection 会更好?可惜 Qt 不是我们设计的!),每个连接都有自己的名字 connectionName,用同一个 connectionName 得取的 QSqlDatabase 对象都是表示同一个连接。有一点需要注意,...
把插入和更新合并为一条语句,业务逻辑层不需要先访问数据库判断数据是否是存在再决定执行插入或者更新,直接调用这个 SQL 即可。 查看UNIQUE 索引或PRIMARY KEY 对应的行是否存在,存在则更新 (执行 ON DUPLICATE KEY UPDATE 后面的语句),不存在则插入新行 1234 # id 是唯一主键INSERT INTO question (id, type, con...
void sheetpivottableupdate (idispatch* sh, idispatch* target) [signal] void sheetselectionchange (idispatch* sh, idispatch* target) [signal] void windowactivate (idispatch* wb, idispatch* wn) [signal] void windowdeactivate (idispatch* wb, idispatch* wn) [signal] void windowresize...
{ time_t t; struct tm *tm; int a = 0; //定义一个语句去接受查询的语句 char sql2[128] = ""; if (!strcmp(dic.password, "#")) //如果在查找单词中输入#就会退出 { return -1; } int found = search_word(acceptfd); //去接受查询单词这个函数的返回值 不为1则代表失败 返回1则代表...
fxcoudert reports that the duplicate :build dep on libtool introduced by that core octave formula update was an oopsie. No actual need for a special :build dep, but I think I'll align my formulae with core just to reduce the diff output. apjanke commented on May 25, 2024 apjanke on...
When a newer version of the application is found in the "appcast" (e.g. the user is using 1.0, and 1.1 is available), a dialog is presented to the user (see below for example) that allows the user to choose whether he/she wants to install the update, be reminded about the update...
ErrorType::GeodatabaseRelationshipClassKey 3029 Geodatabase relationship class key. ErrorType::GeodatabaseValueIsNull 3030 Geodatabase value is nullptr. ErrorType::GeodatabaseMultipleSqlStatements 3031 Geodatabase multiple SQL statements. ErrorType::GeodatabaseNoSqlStatements 3032 Geodatabase no SQL ...
Fix configuring a standalone test on Apple platforms 7fa10ab76eead6731b5d130c7a32836a502902c3 QMovie non-anim: use QImageReader::imageCount but not nextImageDelay ff8928d3cbaa8366a861317f11cb49449dc49eda Update md4c to 0.5.2 2e6e0c6bb439386d167b96529df6bad0a35c0711 QObject: add unittest...
which features are covered by the definition, by applying the whereClause SQL constraint what text should be displayed, based on the individual feature's attributes and the chosen expression formula how the text should appear, using the label definition's TextSymbol where the text should appear,...