在SQLite中,CREATE TABLE IF NOT EXISTS 语句本身就包含了检查表是否存在的逻辑。你不需要显式地编写一个单独的查询来检查表是否存在;这个语句会在尝试创建表之前自动进行这个检查。 2. 如果表不存在,则创建表 这正是 CREATE TABLE IF NOT EXISTS 语句的目的。如果指定的表名在数据库中不存在,SQLite 将执行创建...
select'RetryWaitSeconds','3' wherenotexists(select*fromErrorConfigwhereType='RetryWaitSeconds') 因为SQLite 中不支持SP 补充:sqlite3中NOT IN 不好用的问题 在用sqlite3熟悉SQL的时候遇到了一个百思不得其解的问题,也没有在google上找到答案。虽然最后用“迂回”的方式碰巧解决了这个问题,但暂时不清楚原理是什...
问"CREATE TABLE IF NOT EXISTS“语句在qt sqlite中无效ENDROP TABLE IF EXISTS QRTZ_FIRED_TRIGGERS;...
CREATE TABLE movie (id integer primary key,title text,unique(title));该数据库包含了4个表:book, movie, member, checkout_item。其中，checkout_item⽤于保存member对book和movie的借阅记录，属于关系表。问⼀：哪些member还没有借阅记录？SQL语句（SQL1)如下：SELECT * FROM member WHERE id NOT IN(...
const char * sql = "CREATE TABLE IF NOT EXISTS addlist( \ per_id INTEGER PRIMARY KEY, \ per_name VARCHAR(16) NOT NULL, \ per_sex VARCHAR(2), \ per_number VARCHAR(20), \ per_email VARCHAR(256), \ per_address varchar(256));"; rc = sqlite3_exec(db,sql,NULL,NULL,&pErr); ...
CREATE TABLE IF NOT EXISTS words ( name TEXT PRIMARY KEY, desc TEXT UNIQUE ) WITHOUT ROWID; 查询sqlite_master表: select * from sqlite_master where tbl_name='words' and type='index'; 结果为: type name tbl_name rootpage sql index sqlite_autoindex_words_2 words 9 null 表中自动索引序号是...
String createTableSql = CreateTable.getInstance().setTableName("Student") .addField(SQLField.getOrdinaryField("name","text")) .addField(SQLField.getPrimaryKeyField("id","integer(10)",true)) .createSQLIfNotExists(); 输出的SQL语句: CREATE TABLE IF NOT EXISTS Student(name text,id integer(...
SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE The database is opened for reading and writing, and is created if it does not already exist. This is the behavior that is always used for sqlite3_open() and sqlite3_open16(). If the 3rd parameter to sqlite3_open_v2() is not one of the comb...
To create a new project: cordova create MyProjectFolder com.my.project MyProject (and then cd into your project directory) To add the plugin: cordova plugin add https://github.com/litehelpers/Cordova-sqlite-storage To add the Windows target platform (if it does not exist): cordova platform...
/** * 创建表 */ @Override public void onCreate(SQLiteDatabase db) { // TODO Auto-generated method stub db.execSQL("CREATE TABLE IF NOT EXISTS " + TB_NAME + "(" + CityBean.ID + " integer primary key," + CityBean.CITY + " varchar," + CityBean.CODE + " integer"+ ")"); ...