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,...
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 NULL, "sessionTimeout" integer NOT NULL, "user_id" integer NOT...
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" ("i...
{staticstringdbFile = System.Environment.CurrentDirectory +"\\u8file.db";//////检查和初始化数据库///publicstaticvoidcheckAndInitDB() {if(!File.Exists(dbFile)) { Console.WriteLine("文件不存在,执行创建。"); SQLiteConnection.CreateFile(dbFile);//连接数据库,FailIfMissing=false时若文件不存在也...
-- 创建索引 CREATE INDEX idx_username ON users(username); CREATE INDEX idx_product_price ON products(price); -- 删除索引 DROP INDEX idx_username; 创建和管理全文搜索索引 全文搜索索引用于在文本数据上执行全文搜索操作,可以加速搜索操作。 代码语言:javascript 复制 -- 创建全文搜索索引 CREATE VIRTUAL TA...
executeSql('DROP TABLE IF EXISTS MyTable'); tx.executeSql('CREATE TABLE MyTable (SampleColumn)'); tx.executeSql('INSERT INTO MyTable VALUES (?1)', ['test-value'], function(tx, resultSet) { console.log('resultSet.insertId: ' + resultSet.insertId); console.log('resultSet.rows...
STAT3 only recorded histogram data for the left-most column of each index whereas the STAT4 enhancement records histogram data from all columns of each index.The SQLITE_ENABLE_STAT3 compile-time option is a no-op and is ignored if the SQLITE_ENABLE_STAT4 compile-time option is used Allow ...
if table exists its colums are being compared with table_info from db and if there are columns in db that do not exist in storage (excess) table will be dropped and recreated if preserve is false, and table will be copied into temporary table without excess columns, source table will be...
[paths objectAtIndex:0];strcpy(dbPath, [[documentsDirectory stringByAppendingPathComponent:@"data.sqlite3"] UTF8String]);database= openDb();char*errorMsg;if (sqlite3_exec(database,"CREATE TABLE IF NOT EXISTS test (id INTEGER PRIMARY KEY AUTOINCREMENT, value INTEGER);",NULL,NULL, &errorMsg...
EXISTS or NOT EXISTS) $operands array Contains only one element which is a yii\db\Query object representing the sub-query. $params array The binding parameters to be populated return string The generated SQL expression throws yii\base\InvalidArgumentException if the operand is not a yii\db...