/// <summary>
/// Проверка существования столбца
/// </summary>
/// <param name="db"></param>
/// <param name="table_name"></param>
/// <param name="column_name"></param>
/// <returns></returns>
internal static bool CheckColumn(this DatabaseSqlite db, string table_name, string column_name)
{
if (!db.IsConnected())
{
db.Connect();
}
if (db.IsConnected())
{
using (var command = db.connection.CreateCommand())
{
try
{
string query = $"PRAGMA table_info({table_name});";
command.CommandText = query;
using (var reader = command.ExecuteReader())
{
while (reader.Read())
{
var name = reader["name"]?.ToString() ?? string.Empty;
if (name.Equals(column_name))
{
return(true);
}
}
}
}
catch (Exception ex)
{
db.CallError(ex.Message, ex.StackTrace);
}
}
}
return(false);
}
/// <summary>
/// Инициализация таблиц базы данных
/// </summary>
/// <param name="db"></param>
internal static void InitSchemas(this DatabaseSqlite db)
{
if (!db.IsConnected())
{
db.Connect();
}
foreach (var table in db.tables_schemas)
{
bool isupdate = false;
if (CheckTable(db, table.TableName))
{
IEnumerable <SchemasColumn> dif_columns = new SchemasColumn[0];
if (!TryCheckColumns(db, table.TableName, table.Columns, out dif_columns))
{
foreach (var column in dif_columns)
{
CreatColumn(db, table.TableName, column);
}
isupdate = true;
}
if (isupdate && !string.IsNullOrWhiteSpace(table.UpdateQuery))
{
db.ExecuteNonQuery(table.UpdateQuery);
}
}
else
{
CreatTable(db, table);
}
}
}
/// <summary>
/// Создание столбца
/// </summary>
/// <param name="db"></param>
/// <param name="table_name"></param>
/// <param name="column"></param>
/// <returns></returns>
internal static bool CreatColumn(this DatabaseSqlite db, string table_name, SchemasColumn column)
{
if (!db.IsConnected())
{
db.Connect();
}
if (db.IsConnected())
{
string query = $"ALTER TABLE {table_name} ADD COLUMN {column.Name} {column.ColumnType}";
if (column.DefaultContent != null)
{
query += $" DEFAULT ('{column.DefaultContent.ToString().Replace("'", "").Replace("\\", "")}')";
}
return(db.ExecuteNonQuery(query));
}
return(false);
}
/// <summary>
/// Проверка существования таблицы
/// </summary>
/// <param name="db"></param>
/// <param name="table_name"></param>
/// <returns></returns>
internal static bool CheckTable(this DatabaseSqlite db, string table_name)
{
if (!db.IsConnected())
{
db.Connect();
}
if (db.IsConnected())
{
string query = "SELECT name FROM sqlite_master WHERE type='table' AND name = @table_name;";
Dictionary <string, object> param = new Dictionary <string, object>()
{
{ "table_name", table_name }
};
string tbl_name = db.ExecuteScalar(query, param)?.ToString();
return(!string.IsNullOrWhiteSpace(tbl_name));
}
return(false);
}
/// <summary>
/// Создание таблицы
/// </summary>
/// <param name="db"></param>
/// <param name="structure"></param>
/// <returns></returns>
internal static bool CreatTable(this DatabaseSqlite db, SchemasTable structure)
{
if (!db.IsConnected())
{
db.Connect();
}
if (db.IsConnected())
{
string columns = string.Join(", ", structure.Columns.Select(o => o.GetQueryString()));
string query = $"CREATE TABLE {structure.TableName} ({columns});";
if (db.ExecuteNonQuery(query))
{
if (!string.IsNullOrWhiteSpace(structure.FirstQuery))
{
db.ExecuteNonQuery(structure.FirstQuery);
}
return(true);
}
}
return(false);
}
/// <summary>
/// Проверка существования столбцов
/// </summary>
/// <param name="db"></param>
/// <param name="table_name"></param>
/// <param name="columns"></param>
/// <param name="dif_columns">коллекция столбцов, который отсутствуют в таблице</param>
/// <returns>true - если таблица соответствует схеме</returns>
internal static bool TryCheckColumns(this DatabaseSqlite db, string table_name, IEnumerable <SchemasColumn> columns, out IEnumerable <SchemasColumn> dif_columns)
{
if (!db.IsConnected())
{
db.Connect();
}
if (db.IsConnected())
{
using (var command = db.connection.CreateCommand())
{
try
{
string query = $"PRAGMA table_info({table_name});";
command.CommandText = query;
using (var reader = command.ExecuteReader())
{
List <string> list_columns = new List <string>();
while (reader.Read())
{
var name = reader["name"]?.ToString() ?? string.Empty;
if (!string.IsNullOrWhiteSpace(name))
{
list_columns.Add(name);
}
}
dif_columns = columns.Where(o => list_columns.Find(x => x.Equals(o.Name)) == null).ToArray();
return(dif_columns.Count() == 0);
}
}
catch (Exception ex)
{
db.CallError(ex.Message, ex.StackTrace);
}
}
}
dif_columns = Enumerable.Empty <SchemasColumn>();
return(false);
}
