/// <summary>
/// 初始化 <see cref="ExpressionVisitorBase"/> 类的新实例
/// </summary>
/// <param name="provider">查询语义提供者</param>
/// <param name="aliases">表别名集合</param>
/// <param name="expression">将访问的表达式</param>
public ExpressionVisitorBase(IDbQueryProvider provider, TableAlias aliases, Expression expression)
{
_provider = provider;
_aliases = aliases;
_expression = expression;
_visitedStack = new MemberVisitedStack();
_navMembers = new HashCollection <NavMember>();
}
/// <summary>
/// 实例化 <see cref="MappingCommand"/> 类的新实例
/// </summary>
/// <param name="provider">数据查询提供者</param>
/// <param name="aliases">别名</param>
/// <param name="token">解析上下文参数</param>
public MappingCommand(IDbQueryProvider provider, TableAlias aliases, ResolveToken token)
: base(string.Empty, token != null ? token.Parameters : null, System.Data.CommandType.Text)
{
_provider = provider;
_aliases = aliases;
_navMembers = new HashCollection <NavMember>();
_joinFragment = provider.CreateSqlBuilder(token);
_whereFragment = provider.CreateSqlBuilder(token);
}
/// <summary>
/// 合并外键
/// </summary>
public void AddNavMembers(HashCollection <NavMember> navMembers)
{
if (navMembers != null && navMembers.Count > 0)
{
foreach (var nav in navMembers)
{
if (!_navMembers.Contains(nav.KeyId))
{
_navMembers.Add(nav);
}
}
}
}
