create table table_name(field1 type1, field2 type1, ...); table_name是要创建数据表名称,fieldx是数据表内字段名称,typex则是字段类型。 如:CREATE TABLE IF NOT EXISTS "itm_session" ("sessionID" varchar(40) NOT NULL PRIMARY KEY, "clientIP" varchar(32) NOT NULL, "created" datetime NOT ...
If the table exists, it will result in 1 row. If it doesn't then it results in zero rows.Knowing that, we could also count (1 = table exists, 0 = table does not exist).SELECT count(name) as Counted FROM sqlite_master WHERE type="table" AND name="tablename";...
table_name_fmt%name()%(ptm->tm_year+1900)%(ptm->tm_mon+1)%(ptm->tm_mday)%(ptm->tm_hour)%(ptm->tm_min)%(ptm->tm_sec);// add a record to RecordSummary tableCppSQLite3DB* db = MyDatabase::shared_output_database();if(!db->tableExists("RecordSummary")) {throwHException("...
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...
table_name是要创建数据表名称,fieldx是数据表内字段名称,typex则是字段类型。 如:CREATETABLEIFNOTEXISTS"itm_session" ("sessionID"varchar(40)NOTNULLPRIMARYKEY, "clientIP"varchar(32)NOTNULL, "created" datetimeNOTNULL, "sessionTimeout"integerNOTNULL, "user_id"integerNOTNULLREFERENCES"auth_user" ("...
importsqlite3defcheck_table_exists(table_name):conn=sqlite3.connect('database.db')cursor=conn.cursor()query="SELECT name FROM sqlite_master WHERE type='table' AND name=?"# 使用参数化查询防止 SQL 注入cursor.execute(query,(table_name,))result=cursor.fetchone()conn.close()ifresultisNone:retur...
NSString *sql = @"create table if not exists stu (ID integer primary key, name text not null, gender text default '男')"; // 打开数据库 sqlite3 *db = [DB open]; // 执行sql语句 int result = sqlite3_exec(db, sql.UTF8String, nil, nil, nil); ...
例子:create table kk(name char[30],fd int); (2)避免重复创建表 原型:create table if not exists 表名(列名 列的类型,列名 列的类型...); 例子:create table if not exists kk(name char[30],fd int); 查: .table .tables 删: 原型:drop table 表名; ...
SQL_CREATE_TABLE = '''CREATE TABLE IF NOT EXISTS PEOPLE (ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, AGE INT NOT NULL);''' def create_db_table(self): """ 初始化表 :return: """ self.conn.execute(SQL_CREATE_TABLE) 接下来,我们通过增删改查来操作数据表 1、新增 同样以新增单条...
SQL_CREATE_TABLE = '''CREATE TABLE IF NOT EXISTS PEOPLE (ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, AGE INT NOT NULL);''' def create_db_table(self): """ 初始化表 :return: """ self.conn.execute(SQL_CREATE_TABLE)