1//新建表2try3{4stringdbPath =@"Data Source=D:\sqlliteDb\123.db;Version=3";5stringstrSql ="create table"+ Convert.ToString(textBox8.Text) +"(Id text(255) not null)";//primary key 主键6SQLiteConnection Conn =newSQLiteConnection(dbPath);7Conn.Open();89SQLiteCommand command =newSQLiteC...
public BooleanSQLite_deleteTable(stringtableName) { boolflag =false; try { if(sqliteConn.State != ConnectionState.Open) { sqliteConn.Open(); } SQLiteCommand cmd = new SQLiteCommand(); cmd.Connection = sqliteConn; cmd.CommandText ="DROP TABLE IF EXISTS "+ tableName; cmd.ExecuteNonQuery(); ...
createColumn() Creates a table column. CSqliteSchema createCommandBuilder() Creates a command builder for the database. CSqliteSchema findColumns() Collects the table column metadata. CSqliteSchema findConstraints() Collects the foreign key column details for the given table. CSqliteSchema findTable...
command.CommandText = "CREATE TABLE IF NOT EXISTS Employees (Id INTEGER PRIMARY KEY AUTOINCREMENT, Name TEXT, Age INT);"; command.ExecuteNonQuery(); } 1. 2. 3. 4. 5. 这里我们使用 CREATE TABLE IF NOT EXISTS 语句来创建名为 "Employees" 的表。该表包含三列:Id、Name 和 Age。注意,AUTOINCR...
SQLiteCommand sqliteCmd = sqliteConn.CreateCommand(); sqliteCmd.CommandText = "CREATE table English (English varchar(50) Primary Key,Chinese varchar(50),Phonetic varchar(50))"; sqliteCmd.ExecuteNonQuery(); //插入数据 SQLiteDataAdapter sqliteDa = new SQLiteDataAdapter("select * from English", sqli...
c++创建的(napi_create_object),或者作为参数传下来的js value,如果想持久持有,需要怎么做?以及怎么主动销毁或减少引用计数 在ArkTS层往C++层注册一个object或function,C++层可以按需往这个回调上进行扔消息同步到上层应用么,请提供示例?在注册object或function时,napi_env是否可以被长时持有?扔消息同步到上层应用时...
CREATETABLE[text]([id]INTEGER);然后 C# 的代码段如下 string db_file = @"./test_db.db";...
The command builder to use to build the commands. Applies to Entity Framework Core 9.0 和其他版本 产品版本 Entity Framework Core1.0, 1.1, 2.0, 2.1, 2.2, 3.0, 3.1, 5.0, 6.0, 7.0, 8.0, 9.0 Generate(CreateTableOperation, IModel, MigrationCommandListBuilder, Boolean) ...
SQLiteCommand cmd = new SQLiteCommand(conn); string cmdText = "CREATE TABLE TEST(ID int,name varchar(20))"; cmd.CommandText = cmdText; cmd.ExecuteNonQuery(); 一起把插入数据的代码也贴了,都一样的东西: //插入测试数据 cmd.CommandText = "INSERT INTO [TEST] (ID,name) VALUES (1,'acen')"...
publicvirtual bool CanCreateDataSourceEnumerator{get;}/// 摘要:// 返回实现 System.Data.Common.DbCommand 类的提供程序的类的一个新实例。/// 返回结果:// System.Data.Common.DbCommand 的新实例。publicvirtual DbCommandCreateCommand();/// 摘要:// 返回实现 System.Data.Common.DbCommandBuilder 类的提...