If a NULL value is single-row inserted into a column declared as NOT NULL, an error will be ...
if the SQL mode is not strict (default until MariaDB 10.2.3), if a NULL value is multi-r...
0 How to change null and empty string in sqlite? 3 Is there a way to make NULL behave like 0 (zero) or like an empty string in SQL? 1 Replace instances of strings with NULL 1 SQLite filling null values 0 How to change a column from NULL to NOT NULL in SQLite3? 0 SQLite, F...
#define SQLITE_EMPTY 16 /* 数据库为空 | Database is empty */ #define SQLITE_SCHEMA 17 /* 数据结构发生改变 | The database schema changed */ #define SQLITE_TOOBIG 18 /* 字符串或二进制数据超过大小限制 | String or BLOB exceeds size limit */ #define SQLITE_CONSTRAINT 19 /* 由于约束违例...
cmd.CommandTimeout = 30;if(p !=null) {foreach(objectparminp) cmd.Parameters.AddWithValue(string.Empty, parm); } }publicstaticDataSet ExecuteQuery(stringcmdText,paramsobject[] p) {using(SQLiteConnection conn =newSQLiteConnection(ConnectionString)) ...
I have entity classPersonand I want to query persons from database byfeaturewhich may or may not be null. When I set feature to non-null the query works but when the feature is null the query returns empty list. What I am doing wrong?
我有一个C++单元测试项目,我使用LoadLibraryEx函数加载我为我的应用程序创建的dll,但是LoadLibraryEx失败并返回NULL,然后调用GetLastError函数,错误为182。我还注意到,在执行LoadLibraryEx行后,输出窗口中出现了一个Exception thrown at 0x771718D6 (ntdll.dll) in vstest.executionengine.x86.exe: 0xC0000138: Ordinal...
Getting Null Value After Deserialization of Json Getting Plugin.GoogleClient.Shared.GoogleClientBaseException in android project Getting the error "Newtonsoft.Json.JsonReaderException: Input string '0.0' is not a valid integer. " Getting: Error: Ambiguity between 'MyPage.nameEntry' and 'MyPage.name...
(SQLiteTransaction)System.Web.HttpContext.Current.Items["SQLiteTran"];if((tran !=null) && (String.Equals (tran.Connection.ConnectionString, _connectionString)))returntrue;elsereturnfalse; } The SQLite providers are hard-coded to look for an instance of aSQLiteTransactionobject in the currentHttpCon...
(string dbPath){using(SQLiteConnection connection=newSQLiteConnection("Data Source="+dbPath)){connection.Open();using(SQLiteCommand command=newSQLiteCommand(connection)){command.CommandText="CREATE TABLE Demo(id integer NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE)";command.ExecuteNonQuery();command....