//下面注释里说的都是说sql:’create table if not exists….这里 //userInfo是表格名,你也可以写其他的名,不能用数字作为表格名的开头!!!...//根据传过来的值来获取信息,我这里写了可以有两个条件来获取,都是动态的 //第一个参数为表格名,aa,bb分别为列名和列的值 , cc,dd同前面 //传的参数...
import sqlite3 location = 'data' table_name = 'table_name' def init(): global conn global c conn = sqlite3.connect(location) c = conn.cursor() create_database() def create_database(): sql = 'create table if not exists ' + table_name + ' (id integer)' c.execute(sql) conn.co...
sqLiteDatabase.execSQL("create table if not exists "+ TEACHER +"(_id Integer primary key autoincrement," +"_Tid unique varchar(7) not null,"+"T_name varchar(20) not null," + "T_pass varchar(20) not null," + "T_email varchar(30) not null," + "T_tel varchar(15) not null,...
importsqlite3 persons=[("Hugo","Boss"),("Calvin","Klein")]con=sqlite3.connect(":memory:")# 创建表con.execute("create table person(firstname, lastname)")# 插入数据con.executemany("insert into person(firstname, lastname) values (?, ?)",persons)# 显示数据forrowincon.execute("select firs...
sqlite> CREATE TABLE ...> IF NOT EXISTS ...> member (name TEXT NOT NULL, ...> datestamp DATETIME DEFAULT CURRENT_TIMESTAMP); 在此代码示例中,我在语句的分句后按了回车键。以使其更易于阅读。除非以分号(;)终止,否则 SQLite 不会运行你的 SQL 语句。
if(rc!=SQLITE_OK){ std::cerr<<"Failed to open database: "<<sqlite3_errmsg(db)<<std::endl; return1; } constchar*create_table_sql="CREATE TABLE IF NOT EXISTS your_table (id INTEGER PRIMARY KEY, name TEXT);"; rc=sqlite3_exec(db,create_table_sql,nullptr,nullptr,nullptr); ...
创建数据库命令——create database 修改数据库命令——alter database 创建新表的命令——create table 变更数据库中的表——alter table 删除表——drop table 创建索引——create index 删除索引——drop index 三、iOS的数据库技术的实现 开始使用SQLite所需要的几个步骤 ...
publicvoidcreateDataBase()throws Exception{boolean dbExist=checkDataBase();if(dbExist){System.out.println("Database Exist");}else{this.getReadableDatabase();try{}catch(Exception e){thrownewError(e.getMessage());}}}/** * Check if the database already exist to avoid re-copying the file...
db.execSQL("create table if not exists " + TABLE_NAME +"(id text primary key,name text)"); rawQuery db.rawQuery("SELECT * FROM test", null); 3.2 SQLiteOpenHelper SQLiteOpenHelper是SQLiteDatabase的辅助类,通过对SQLiteDatabase内部方法的封装简化了数据库创建与版本管理的操作。它是一个抽象类,一般...
DATABASE '{}' AS my_db".format(database_path))returnTrueexceptsqlite3.OperationalError:returnFalsefinally:cursor.close()conn.close()database_path="mydatabase.db"ifnotis_database_exists(database_path):create_database(database_path)print("Database created successfully!")else:print("Database ...