2.2-增删改查 --插入--注意:Integer允许自动增长(不要被Identity 忽悠)insertintoUserInfo(UserId,UserNames,UserPasss,RegDate)values(1001,'admin','admin','2021-01-21')insertintoUserInfo(UserId,UserNames,UserPasss,RegDate)values(1002,'sanha','sanha', datetime('now','localtime'))--查询select*f...
/// /// <value>The date time string format.</value> public string DateTimeStringFormat { get; private set; } /// /// The DateTimeStyles value to use when parsing a DateTime property string. /// /// <value>The date time style.</value> internal System.Globalization.DateTimeStyles ...
在SQLite 中,可以使用内置的日期和时间函数将字符串转换为日期。常用的函数包括datetime(),date(), 和time()。 示例代码 假设我们有一个表events,其中有一个列event_time存储为字符串: 代码语言:txt 复制 CREATE TABLE events ( id INTEGER PRIMARY KEY, event_name TEXT, event_time TEXT ); ...
age INTEGER );)";}Dbhelper::~Dbhelper(){ if(db!= nullptr){ db->closeSql(); delete db; }}int Dbhelper::createTable(){ db->setDbDir(DATA_PATH); bool ret = db->creatDbFile(DB_NAME); if(!ret){ return -1; } ret = db->reOpenSql(DB_NAME); if(ret){ db->queryExec(QStri...
#include "dbhelper.h" #include "cglobal.h" Dbhelper::Dbhelper() { db = new sqliteDb(); init_table_0 = R"( CREATE TABLE IF NOT EXISTS tb_user ( id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, name CHAR (50) NOT NULL, age INTEGER );)"; } Dbhelper::~Dbhelper() { if(db!=...
INTEGER值是一个带符号的整数，根据值的大小存储在1、2、3、4、6或8字节中。REAL浮点数字，存储为8...
不同于TEXT和REAL,我们可以用INTEGER字段来存储日期和时间值。我们通常用INTEGER来表示UNIX时间戳,也就是自1970-01-01 00:00:00 UTC以来的秒数。 测试 CREATETABLEdatetime_int(d1int);INSERTINTOdatetime_int(d1)VALUES(strftime('%s','now'));SELECTd1FROMdatetime_int; ...
The JULIANDAY function converts dates into Julian Day numbers, enabling date arithmetic. Practical Example with Tables Table Setup Code: -- Create a table to store event data CREATE TABLE events ( id INTEGER PRIMARY KEY, event_name TEXT, ...
select cast(JulianDay('now') - JulianDay(last_upd_dt) * 24 * 60 * 60 As Integer) "gives me null value", last_upd_dt as "from date", datetime('now') as "To date this will be another field in the future", (datetime('now') - last_upd_dt ) as "Gives me 2012 on all reco...
it will be stored as TEXT. If however, the DateTimeFormat property of the connection string is set to UnixEpoch, then the System.Data.SQLite library will store an integer value which will result in the database storing the value with the INTEGER storage class, but the column will still hav...