public IDbScalar <TModel, TReturnType> Where(Expression <Func <TModel, object> > expression)
{
_whereExpressionVisitor = new WhereExpressionVisitor().Visit(expression);
_whereClause = string.Format(_dbProvider.Dialect.Where, _whereExpressionVisitor.WhereExpression);
_parameters = _whereExpressionVisitor.Parameters;
return(this);
}
/// <summary>
/// Delete the Database Record based on an expression
/// </summary>
/// <typeparam name="TModel">Model Type</typeparam>
/// <param name="dbProvider">Database Provider</param>
/// <param name="expression">The expression to use for the query</param>
/// <remarks>THIS IS A HARD DELETE. When you run this method, the record is GONE!</remarks>
public static void Delete <TModel>(this IDbProvider dbProvider, Expression <Func <TModel, object> > expression) where TModel : class, new()
{
var visitor = new WhereExpressionVisitor().Visit(expression);
// this is a hard delete. soft deletes will happen in the repository layer.
var tableName = typeof(TModel).GetTypeInfo().Name.BuildTableName();
var whereClause = string.Format(dbProvider.Dialect.Where, visitor.WhereExpression);
var commandText = string.Format(dbProvider.Dialect.DeleteFrom, tableName, whereClause);
dbProvider.ExecuteNonQuery(commandText, visitor.Parameters);
}
/// <summary>
/// DeleteAsync the Database Record based on an expression
/// </summary>
/// <typeparam name="TModel">Model Type</typeparam>
/// <param name="expression">The expression to use for the query</param>
/// <remarks>THIS IS A HARD DELETE. When you run this method, the record is GONE!</remarks>
public Task DeleteAsync <TModel>(Expression <Func <TModel, bool> > expression)
where TModel : class, new()
{
var visitor = new WhereExpressionVisitor().Visit(expression);
// this is a hard delete. soft deletes will happen in the repository layer.
var tableName = typeof(TModel).GetTypeInfo().Name.BuildTableName();
var whereClause = string.Format(Dialect.Where, visitor.WhereExpression);
var commandText = string.Format(Dialect.DeleteFrom, tableName, whereClause);
return(ExecuteNonQueryAsync(commandText, visitor.Parameters));
}
public IDbQuery <TModel> Where(Expression <Func <TModel, object> > expression)
{
_whereExpressionVisitor = new WhereExpressionVisitor(_parameters).Visit(expression);
_parameters = _whereExpressionVisitor.Parameters;
if (string.IsNullOrEmpty(_whereClause))
{
_whereClause = string.Format(_dbProvider.Dialect.Where, _whereExpressionVisitor.WhereExpression);
}
else
{
_whereClause += " AND " + _whereExpressionVisitor.WhereExpression;
}
return(this);
}
