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using System.Text;
namespace CrupestApi.Commons.Crud.Tests;
public class SqlCompareHelper
{
private static List<char> SymbolTokens = new List<char>() { '(', ')', ';' };
public static List<string> SqlExtractWords(string? sql, bool toLower = true)
{
var result = new List<string>();
if (string.IsNullOrEmpty(sql))
{
return result;
}
var current = 0;
StringBuilder? wordBuilder = null;
while (current < sql.Length)
{
if (char.IsWhiteSpace(sql[current]))
{
if (wordBuilder is not null)
{
result.Add(wordBuilder.ToString());
wordBuilder = null;
}
}
else if (SymbolTokens.Contains(sql[current]))
{
if (wordBuilder is not null)
{
result.Add(wordBuilder.ToString());
wordBuilder = null;
}
result.Add(sql[current].ToString());
}
else
{
if (wordBuilder is not null)
{
wordBuilder.Append(sql[current]);
}
else
{
wordBuilder = new StringBuilder();
wordBuilder.Append(sql[current]);
}
}
current++;
}
if (wordBuilder is not null)
{
result.Add(wordBuilder.ToString());
}
if (toLower)
{
for (int i = 0; i < result.Count; i++)
{
result[i] = result[i].ToLower();
}
}
return result;
}
public static bool SqlEqual(string left, string right)
{
return SqlExtractWords(left) == SqlExtractWords(right);
}
[Fact]
public void TestSqlExtractWords()
{
var sql = "SELECT * FROM TableName WHERE (id = @abcd);";
var words = SqlExtractWords(sql);
Assert.Equal(new List<string> { "select", "*", "from", "tablename", "where", "(", "id", "=", "@abcd", ")", ";" }, words);
}
}
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