The following method should check if the record already exists in the table or no. But, I receive the syntax error "no such column". publicvoidifExist(intmyId){stringdbPath=Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal),"ormdemo.db3");vardb=newSQLiteConnection(dbPath);...
if it exists, false if it doesn't */privatebooleancheckDataBase(){SQLiteDatabase checkDB=null;try{String myPath=DB_PATH+DB_NAME;checkDB=SQLiteDatabase.openDatabase(myPath,null,SQLiteDatabase.OPEN_READWRITE);}catch(Exception e){System.out.println("database does't exist yet.");}if(ch...
这是我试图删除特定选定记录的内容。 public void deleteRecord(String datarecord) { this.db.delete(TABLE_NAME, "name="+datarecord , null); } 这就是我在click事件上所做的事情,我从这里执行所选记录的删除操作。 dh.deleteRecord(FavMusicList[position]); dh是我在其中创建了deleteRecord函...
SQL语句关键字和格式 create table if not exists 表名(字段1 约束列表,字段2 约束列表 。。。); insert into 表名(字段列表)values(字段值列表); update(表名)set 字段名1 = 修改值1,字段名2 = 修改值2,...where条件 where 条件关键字 多个条件用 and 连接 delete from 表名 where 条件 (可以删表,...
if( 0==pBt->nTransaction ){ pBt->inTransaction = TRANS_NONE; } } } //提交事务,主要调用pager_unwritelock()函数 int sqlite3pager_commit(Pager *pPager){ int rc; PgHdr *pPg; if( pPager->errCode ){ return pPager->errCode; }
#pragmaonce#include<QSqlDatabase>#include<QSqlQuery>#include<QSqlError>#include<QSqlRecord>#include<QDebug>#include<QDir>#include<iostream>#include"CGlobal.h"classMainDB {public: MainDB(std::stringconnection);///插入记录boolinsertExpressLog(Info info);///查询是否已录入boolcheckExpressIfExists(Q...
CREATE TABLE IF NOT EXISTS student (no integer primary key, name text, score real); 1. 常用函数 sqlite3_open int sqlite3_open(char *path, sqlite3 **db);功能: 打开sqlite数据库参数: path: 数据库文件路径 db: 指向sqlite句柄的指针,后面对数据库所有的操作都要依赖这个句柄返回值: 成功返回0,...
SQLite EXISTS ClauseSELECT column1, column2...columnN FROM table_name WHERE column_name EXISTS (SELECT * FROM table_name ); SQLite EXPLAIN StatementEXPLAIN INSERT statement...; or EXPLAIN QUERY PLAN SELECT statement...; SQLite GLOB ClauseSELECT...
SELECT*FROMValueRecordASVR1WHERENOTEXISTS(SELECT1FROMValueRecordASVR2WHERE((CAST(strftime('%H',VR1.datetimes)ASINTEGER)=CAST(strftime('%H',VR2.datetimes)ASINTEGER)ANDCAST(strftime('%M',VR1.datetimes)ASINTEGER)<30ANDCAST(strftime('%M',VR2.datetimes)ASINTEGER)<30)OR(CAST(strftime('%H',VR...
\n"//文件表letcreatFileSql="CREATE TABLE IF NOT EXISTS T_RecordFile(id INTEGER PRIMARY KEY AUTOINCREMENT,"+"CheckTaskGuid TEXT,"+"FireDeviceGuid TEXT,"+"Type INTEGER,"+"FilePath TEXT,"+"URL TEXT"+"); \n"ifEISSQLiteManager.shareManager().creatTable(sql:creatSql){print("创建设备表成功...