/// <summary>
/// 初始化 <see cref="DbExpressionVisitor"/> 类的新实例
/// </summary>
/// <param name="ag">表别名解析器</param>
/// <param name="builder">SQL 语句生成器</param>
public DbExpressionVisitor(AliasGenerator ag, ISqlBuilder builder)
{
_ag = ag;
_builder = builder;
_provider = (DbQueryProvider)_builder.Provider;
_visitedStack = new MemberVisitedStack();
}
/// <summary>
/// 初始化 <see cref="NpgUpdateExpressionVisitor"/> 类的新实例
/// </summary>
/// <param name="ag">表别名解析器</param>
/// <param name="builder">SQL 语句生成器</param>
public NpgUpdateExpressionVisitor(AliasGenerator ag, ISqlBuilder builder)
: base(ag, builder)
{
_ag = ag;
_builder = builder;
_visitedStack = base.VisitedStack;
}
/// <summary>
/// 初始化 <see cref="SQLiteUpdateExpressionVisitor"/> 类的新实例
/// </summary>
/// <param name="ag">表别名解析器</param>
/// <param name="builder">SQL 语句生成器</param>
/// <param name="tree">更新语义</param>
/// <param name="alias">指定的表达式别名</param>
internal SQLiteUpdateExpressionVisitor(AliasGenerator ag, ISqlBuilder builder, DbQueryUpdateTree tree, string alias)
: base(ag, builder)
{
_tree = tree;
_alias = alias;
_builder = builder;
_visitedStack = base.VisitedStack;
}
/// <summary>
/// 初始化 <see cref="ColumnExpressionVisitor"/> 类的新实例
/// </summary>
/// <param name="ag">表别名解析器</param>
/// <param name="builder">SQL 语句生成器</param>
/// <param name="tree">查询语义</param>
public ColumnExpressionVisitor(AliasGenerator ag, ISqlBuilder builder, DbQuerySelectTree tree)
: base(ag, builder)
{
_ag = ag;
_builder = builder;
_groupBy = tree.GroupBy;
_includes = tree.Includes;
_selectedColumns = new ColumnDescriptorCollection();
_visitedStack = base.VisitedStack;
}
/// <summary>
/// 实例化 <see cref="MethodCallExpressionVisitor"/> 类的新实例
/// </summary>
/// <param name="visitor">表达式访问器</param>
public MethodCallExpressionVisitor(DbExpressionVisitor visitor)
{
_visitor = visitor;
_builder = visitor.SqlBuilder;
_visitedStack = _visitor.VisitedStack;
}
