/// <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, DbExpression target,
DbExpression condition) where TQueryExpression : DbQueryExpression, new()
{
var dbExpression = (DbExpression)DbExpressionFactory.MakeJoin(joinExpressionType, target, condition);
if (!query.QueryExpression.FromExpression.IsNull())
{
dbExpression = DbExpressionFactory.Concat(query.QueryExpression.FromExpression, dbExpression);
}
query.QueryExpression.FromExpression = dbExpression;
return(query);
}
/// <summary>
/// Initializes a new instance of the <see cref="DbJoinExpression"/> class.
/// </summary>
/// <param name="joinExpressionType">The <see cref="DbJoinExpressionType"/> that specifies the type of <see cref="DbJoinExpression"/> to create.</param>
/// <param name="target">The join target <see cref="DbExpression"/>.</param>
/// <param name="condition">The join condition.</param>
internal DbJoinExpression(DbJoinExpressionType joinExpressionType, DbExpression target, DbExpression condition)
{
JoinExpressionType = joinExpressionType;
Target = target;
Condition = condition;
}
/// <summary>
/// Initializes a new instance of the <see cref="DbJoinExpression"/> class.
/// </summary>
/// <param name="joinExpressionType">The <see cref="DbJoinExpressionType"/> that specifies the type of <see cref="DbJoinExpression"/> to create.</param>
/// <param name="target">The join target <see cref="DbExpression"/>.</param>
/// <param name="condition">The join condition.</param>
internal DbJoinExpression(DbJoinExpressionType joinExpressionType, DbExpression target, DbExpression condition)
{
JoinExpressionType = joinExpressionType;
Target = target;
Condition = condition;
}
/// <summary>
/// Creates a new <see cref="DbJoinExpression"/>.
/// </summary>
/// <param name="joinType">The <see cref="DbJoinExpressionType"/> that specifies the type of join to create.</param>
/// <param name="target">The join target.</param>
/// <param name="condition">The join condition.</param>
/// <returns>A <see cref="DbJoinExpression"/> instance.</returns>
public DbJoinExpression MakeJoin(DbJoinExpressionType joinType, DbExpression target, DbExpression condition)
{
var joinExpression = new DbJoinExpression(joinType, target, condition);
return joinExpression;
}
/// <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)));
}
