replace(X,Y,Z) The replace(X,Y,Z) function returns a string formed by substituting string Z for every occurrence of string Y in string X. The BINARY collating sequence is used for comparisons. If Y is an empty
REPLACE(X, Y, Z) – X is the input string literal or column. Y is the string to replace with the string Z. Note that it will replace any occurrence of the string Y with Z, not just one. Example: In the following query, we will replace all the occurrence of the string “xx” w...
replace(X,Y,Z) 将字符串类型的函数参数X中所有子字符串Y替换为字符串Z,最后返回替换后的字符串,源字符串X保持不变。 round(X[,Y]) 返回数值参数X被四舍五入到Y刻度的值,如果参数Y不存在,缺省参数值为0。 rtrim(X[,Y]) 如果没有可选参数Y,该函数将移除参数X右侧的所有空格符。如果有参数Y,则移除X...
firstname text, lastname text)")stmt.Exec()stmt,_=database.Prepare("insert into user( firstname, lastname) values(?,?)")stmt.Exec("Jack","Chen")varid intvarfirstname stringvarlastname string
("ADODB.Connection") Dim Connstr As String Dim arr As Variant, i As Long Connstr = "Driver={SQLite3 ODBC Driver};Database=C:\sqlite\day_book.db" conn.Open Connstr arr = Sheets("销售数据源").[a1].CurrentRegion For i = 2 To UBound(arr) conn.Execute "insert or replace into 销售...
stringValue.Replace(oldValue, newValue) replace(@stringValue, @oldValue, @newValue) stringValue.StartsWith(value) @stringValue LIKE @value || '%' stringValue.Substring(startIndex) substr(@stringValue, @startIndex + 1) stringValue.Substring(startIndex, length) substr(@stringValue, @startIndex...
Print STRING in place of NULL values(以 STRING 代替 NULL 值的输出) .output FILENAME Send output to FILENAME(输出到文件, 而不是显示在屏幕上) .output stdout Send output to the screen(输出到屏幕上) .prompt MAIN CONTINUE Replace the standard prompts(替换默认的命令提示信息, 默认就是 sqlite>)...
qDebug() << "Found character in range [a-f]"; } 1. 2. 3. 4. 5. 6. 7. 8. 9. at()函数可以比operator []()更快,因为它不会导致深度复制。或者,使用left()、right()或mid()函数一次提取几个字符。 QString可以嵌入“\0”字符(QChar::Null)。size()函数始终返回整个字符串的大小,包括嵌...
select ename ,replace(job,'manager','经理') from emp; -- strcmp (str1,str2) 逐字符比较两字符的大小 select strcmp('hsp','Hsp') from dual; -- substring(str,position [,length]) 从str的position开始,[从1开始计算] 截取字符串 select substring(ename,1,2) from emp; -- 从ename列的第一...
Future<void> insertData(MyData data, Database db) async {try {// 插入数据到数据库await db.insert('my_table',data.toMap(),// 如果插入的数据与已有数据冲突(例如,两个数据有相同的主键),则替换旧数据conflictAlgorithm: ConflictAlgorithm.replace,);} catch (e) {// 打印错误信息print('Failed to ...