如何從文本文件中提取單詞

Question

我有一個存儲過程文本文件。我有很多表和列的名稱。

如何從文本文件中獲取表名和列名。

例如

select t1.name, t2.roleid, t3.department, t4.country from dbo.user t1 inner join 
dbo.role t2 on t1.roleid = t2.roleid inner join dbo.tbldepartment t3 on t1.departmentid= t3.departmentid inner join dbo.country t4 on t1.countryid = t4.countryid 

結果

Table name => dbo.user 
Coulmn name => name 

table name => dbo.role 
column name =>roleid 

Table name => dbo.tbldepartment 
column name => departmentid 

Table name =>dbo.country 
column name => countryid 

Answer 1

一些代碼...

string file = File.ReadAllText(@"E:\Projects\testApp\testApp\bin\Debug\file.txt"); 
string textAfterFrom = file.After(" from "); 
string textBeforeFrom = file.Before(" from "); 
string[] textArrayAfterSelect = textBeforeFrom.After("select").Split(','); 

List<ColumnTableRelation> ListofTable = new List<ColumnTableRelation>(); 
ColumnTableRelation objRel = new ColumnTableRelation(); 

string[] splitTables = textAfterFrom.Split('\n'); 

foreach (string tableNames in splitTables) 
{ 
    objRel = new ColumnTableRelation(); 
    if (!string.IsNullOrEmpty(tableNames) & !tableNames.Equals("\r")) 
    { 
     if (tableNames.Contains("dbo.")) 
     { 
      if (tableNames.Contains("inner join")) 
      { 
      objRel.Tablename = tableNames.Between("inner join", " on ").Trim(); 
      } 
      else 
      { 
      objRel.Tablename = tableNames.Before("\r").Trim(); 
      } 
     } 
     ListofTable.Add(objRel); 
    } 
} 

foreach (var item in ListofTable) 
{ 
    string[] stringArray = textArrayAfterSelect; 
    string value = item.Tablename.After(" "); 
    var matchingvalues = stringArray.Where(stringToCheck => stringToCheck.Contains(value)); 
    List<string> listString = new List<string>(); 
    foreach (var match in matchingvalues) 
    { 
     listString.Add(match); 
    } 
    item.ColumnNames = listString; 
} 
StringBuilder builder = new StringBuilder(); 
foreach (var item in ListofTable) 
{ 
    builder.Append(Environment.NewLine); 
    builder.Append("Table name => " + item.Tablename + Environment.NewLine); 
    foreach (var columns in item.ColumnNames) 
    { 
     builder.Append("Column name => " + columns + Environment.NewLine); 
    } 
} 
string yourResult = builder.ToString(); 
MessageBox.Show(yourResult); 

你會得到你的輸出這樣

你可以有你的擴展類SubstringExtensions從這個鏈接https://www.dotnetperls.com/between-before-after

而且到你的項目

public class ColumnTableRelation 
{ 
    public string Tablename { get; set; } 
    public List<string> ColumnNames { get; set; } 
} 

任何疑問，應理解

我與

嘗試過這種添加該類

select t1.name, t2.roleid, t3.department, t4.country from 
dbo.user t1 
inner join dbo.role t2 on t1.roleid = t2.roleid 
inner join dbo.tbldepartment t3 on t1.departmentid= t3.departmentid 
inner join dbo.country t4 on t1.countryid = t4.countryid