/// <summary>
/// Translates the <paramref name="query"/> into a string representation.
/// </summary>
/// <param name="query">The <see cref="DbInExpression"/> to translate.</param>
/// <returns><see cref="DbExpression"/></returns>
protected virtual DbExpression VisitQueryExpression(DbQuery query)
{
return(Visit(query.GetQueryExpression()));
}
/// <summary>
/// Specifies the column to be updated.
/// </summary>
/// <param name="dbUpdateQuery">The target <see cref="DbQuery{TQueryExpression}"/>.</param>
/// <param name="columnSelector">A function used to specify the column to be updated.</param>
/// <param name="valueSelector">A function used to specify the new value.</param>
/// <returns><see cref="DbQuery{TQueryExpression}"/></returns>
public static DbQuery <DbUpdateExpression> Set(this DbQuery <DbUpdateExpression> dbUpdateQuery,
Func <DbExpressionFactory, DbExpression> columnSelector, Func <DbExpressionFactory, DbExpression> valueSelector)
{
return(Set(dbUpdateQuery, columnSelector(DbExpressionFactory), valueSelector(DbExpressionFactory)));
}
/// <summary>
/// Specifies the column to be updated.
/// </summary>
/// <param name="dbUpdateQuery">The target <see cref="DbQuery{TQueryExpression}"/>.</param>
/// <param name="columnSelector">A function used to specify the column to be updated.</param>
/// <param name="value">The new value.</param>
/// <returns><see cref="DbQuery{TQueryExpression}"/></returns>
public static DbQuery <DbUpdateExpression> Set(this DbQuery <DbUpdateExpression> dbUpdateQuery, Func <DbExpressionFactory, DbExpression> columnSelector, object value)
{
return(Set(dbUpdateQuery, columnSelector(DbExpressionFactory), DbExpressionFactory.Constant(value)));
}
/// <summary>
/// Bypasses a specified number of rows in the result set.
/// </summary>
/// <param name="dbSelectQuery">The target <see cref="DbQuery{TQueryExpression}"/>.</param>
/// <param name="count">The number of rows to bypass in the result set</param>
/// <returns><see cref="DbQuery{TQueryExpression}"/></returns>
public static DbQuery <DbSelectExpression> Skip(this DbQuery <DbSelectExpression> dbSelectQuery, int count)
{
dbSelectQuery.QueryExpression.SkipExpression = DbExpressionFactory.Constant(count);
return(dbSelectQuery);
}
/// <summary>
/// Creates a new <see cref="DbOrderByExpression"/> that represents an descending ordering of the result set.
/// </summary>
/// <param name="dbSelectQuery">The target <see cref="DbQuery{TQueryExpression}"/>.</param>
/// <param name="expressionSelector">A function used to specify an element in the 'ORDER BY' clause.</param>
public static DbQuery <DbSelectExpression> OrderByDescending(this DbQuery <DbSelectExpression> dbSelectQuery, Func <DbExpressionFactory, DbExpression> expressionSelector)
{
return(OrderBy(dbSelectQuery, expressionSelector, DbOrderByExpressionType.Ascending));
}
/// <summary>
/// Specifies the values to be inserted.
/// </summary>
/// <param name="dbInsertQuery">The target <see cref="DbQuery{TQueryExpression}"/>.</param>
/// <param name="valuesExpression">The <see cref="DbExpression"/> that represents the values to be inserted.</param>
/// <returns>A <see cref="DbInsertQuery"/> instance.</returns>
public static DbQuery <DbInsertExpression> Values(this DbQuery <DbInsertExpression> dbInsertQuery, DbExpression valuesExpression)
{
dbInsertQuery.QueryExpression.Values = valuesExpression;
return(dbInsertQuery);
}
/// <summary>
/// Bypasses a specified number of rows in the result set.
/// </summary>
/// <param name="dbSelectQuery">The target <see cref="DbQuery{TQueryExpression}"/>.</param>
/// <param name="expressionSelector">A function used to create a <see cref="DbExpression"/> that the number of rows to bypass.</param>
/// <returns><see cref="DbQuery{TQueryExpression}"/></returns>
public static DbQuery <DbSelectExpression> Skip(this DbQuery <DbSelectExpression> dbSelectQuery, Func <DbExpressionFactory, DbExpression> expressionSelector)
{
dbSelectQuery.QueryExpression.SkipExpression = expressionSelector(DbExpressionFactory);
return(dbSelectQuery);
}
/// <summary>
/// Specifies the values to be inserted.
/// </summary>
/// <param name="dbInsertQuery">The target <see cref="DbQuery{TQueryExpression}"/>.</param>
/// <param name="valueSelector">A <see cref="Func{T,TResult}"/> used to specify the values to be inserted.</param>
/// <returns>A <see cref="DbInsertQuery"/> instance.</returns>
public static DbQuery <DbInsertExpression> Values(this DbQuery <DbInsertExpression> dbInsertQuery, params Func <DbExpressionFactory, DbExpression>[] valueSelector)
{
return(Values(dbInsertQuery, DbExpressionFactory.List(valueSelector.Select(e => e(DbExpressionFactory)))));
}
/// <summary>
/// Creates an 'INNER JOIN' between the current 'FROM' clause and the expression returned by the <paramref name="target"/> functor.
/// </summary>
/// <param name="query">The target <see cref="DbQuery{TQueryExpression}"/></param>
/// <param name="target">The target join expression.</param>
/// <param name="condition">A <see cref="DbExpression"/> that specifies the join condition.</param>
/// <returns><see cref="DbQuery{TQueryExpression}"/></returns>
public static DbQuery <TQueryExpression> InnerJoin <TQueryExpression>(this DbQuery <TQueryExpression> query,
Func <DbExpressionFactory, DbExpression> target, Func <DbExpressionFactory, DbExpression> condition)
where TQueryExpression : DbQueryExpression, new()
{
return(Join(query, DbJoinExpressionType.InnerJoin, target, condition));
}
/// <summary>
/// Creates a <see cref="DbJoinExpression"/> between the current 'FROM' clause and the expression returned by the <paramref name="target"/> functor.
/// </summary>
/// <param name="joinExpressionType">Specifies the type of join expression.</param>
/// <param name="query">The target <see cref="DbQuery{TQueryExpression}"/></param>
/// <param name="target">The target join expression.</param>
/// <param name="condition">A <see cref="DbExpression"/> that specifies the join condition.</param>
/// <returns><see cref="DbQuery{TQueryExpression}"/></returns>
public static DbQuery <TQueryExpression> Join <TQueryExpression>(this DbQuery <TQueryExpression> query,
DbJoinExpressionType joinExpressionType, Func <DbExpressionFactory, DbExpression> target,
Func <DbExpressionFactory, DbExpression> condition) where TQueryExpression : DbQueryExpression, new()
{
return(Join(query, joinExpressionType, target(DbExpressionFactory), condition(DbExpressionFactory)));
}
/// <summary>
/// Specifies the tables, views, derived tables, and joined tables used in DELETE, SELECT, and UPDATE statements.
/// </summary>
/// <param name="query">The target <see cref="DbQuery{TQueryExpression}"/></param>
/// <param name="expressionSelector">A <see cref="Func{T,TResult}"/> to specify the <see cref="DbExpression"/>.</param>
/// <returns><see cref="DbQuery{TQueryExpression}"/></returns>
public static DbQuery <TQueryExpression> From <TQueryExpression>(this DbQuery <TQueryExpression> query, Func <DbExpressionFactory, DbExpression> expressionSelector)
where TQueryExpression : DbQueryExpression, new()
{
return(From(query, expressionSelector(DbExpressionFactory)));
}
/// <summary>
/// Creates an 'RIGHT OUTER JOIN' between the current 'FROM' clause and the expression returned by the <paramref name="target"/> functor.
/// </summary>
/// <param name="query">The target <see cref="DbQuery{TQueryExpression}"/></param>
/// <param name="target">The target join expression.</param>
/// <param name="condition">A <see cref="DbExpression"/> that specifies the join condition.</param>
/// <returns><see cref="DbQuery{TQueryExpression}"/></returns>
public static DbQuery <TQueryExpression> RightOuterJoin <TQueryExpression>(this DbQuery <TQueryExpression> query,
DbExpression target, DbExpression condition)
where TQueryExpression : DbQueryExpression, new()
{
return(Join(query, DbJoinExpressionType.RightOuterJoin, target, condition));
}
