private void FindTag(string sql, int position)
{
if (position >= sql.Length)
{
return;
}
Match match = find.Match(sql, position);
if (match.Success)
{
string value = match.Value.Trim();
if (value.EndsWith(")") || value.EndsWith("("))
{
string field = value.Substring(0, value.Length - 1);
if (field.Length > 0)
{
TagTreeNode node1 = TagFactory.Create(field);
tags.Append(node1);
}
TagTreeNode node2 = TagFactory.Create(value.Substring(value.Length - 1));
tags.Append(node2);
}
else
{
TagTreeNode node = TagFactory.Create(value);
tags.Append(node);
}
position = match.Index + match.Value.Length;
FindTag(sql, position);
}
}
public static TagTreeNode Create(string value)
{
if (string.IsNullOrWhiteSpace(value))
{
return(null);
}
string key = value.Trim().ToLower();
TagTreeNode node = new TagTreeNode();
node.NodeKey = defaultTag;
if (key == "(")
{
node.NodeKey = "l_" + child;
}
else if (key == ")")
{
node.NodeKey = "r_" + child;
}
else
{
foreach (string k in allTag)
{
if (k == key)
{
node.NodeKey = k;
break;
}
}
}
if (node.NodeKey == defaultTag)
{
node.NodeData = new List <string>(key.Split(','));
}
return(node);
}
public void Append(TagTreeNode node)
{
if (head == null)
{
head = node;
tail = node;
return;
}
//
tail.NextNode = node;
tail = node;
}
public List <Tag.Tag> GetTags()
{
List <Tag.Tag> tags = new List <Tag.Tag>();
TagTreeNode next = head.NextNode;
TagTreeNode last = null;
TagTreeNode cur = null;
TagTreeNode lastPre = null;
Tag.Tag tag = new Tag.Tag();
try
{
tag.TagType = (TagType)Enum.Parse(typeof(TagType), head.NodeKey);
}
catch
{
throw new Exception("SQL异常");
}
while (next != null)
{
if (TagFactory.defaultTag == next.NodeKey)
{
//说明是数据
if (null == last)
{
cur = head;
}
else
{
cur = last;
}
//
switch (cur.NodeKey)
{
case "select":
tag.Fields.AddRange(next.NodeData);
break;
case "from":
case "table":
case "into":
case "join":
tag.Table.AddRange(next.NodeData);
break;
case "l_clause":
{
if (lastPre != null && lastPre.NodeKey == "into")
{
tag.Fields.AddRange(next.NodeData);
}
}
break;
case "as":
{
if (lastPre != null && lastPre.NodeData.Count > 0)
{
tag.Alias[lastPre.NodeData[lastPre.NodeData.Count - 1]] = next.NodeData[0];
}
}
break;
case "field":
{
if (cur.NodeData.Count > 0)
{
tag.Alias[cur.NodeData[cur.NodeData.Count - 1]] = next.NodeData[0];
}
}
break;
}
//
}
else
{
TagType tagType;
if (Enum.TryParse <TagType>(next.NodeKey, out tagType))
{
//说明是操作类关键词
tags.Add(tag);
tag = new Tag.Tag();
tag.TagType = tagType;
}
}
lastPre = last;
last = next;
next = next.NextNode;
}
//
tags.Add(tag);
return(tags);
}
