转义转义字符不起作用 – SQL LIKE运算符

我使用\作为LIKE运算符的escape character 。 我正在逃避四个角色

1 % 2 [ 3 ] 4 _

当我将转义字符作为输入传递时，查询不返回值。 我怎样才能使它工作？

数据插入

 DECLARE @Text VARCHAR(MAX) SET @Text = 'Error \\\ \\ C:\toolbox\line 180' INSERT INTO Account (AccountNumber,AccountType,Duration,ModifiedTime) VALUES (198,@Text,1,GETDATE()) 

码

  static void Main(string[] args) { string searchValue1 = @"Error \\\ \\ C:\toolbox\line 180"; string searchValue2 = @"55555"; string result1 = DisplayTest(searchValue1); string result2 = DisplayTest(searchValue2); Console.WriteLine("result1:: " + result1); Console.WriteLine("result2:: " + result2); Console.ReadLine(); }} private static string DisplayTest(string searchValue) { searchValue = CustomFormat(searchValue); string test = String.Empty; string connectionString = "Data Source=.;Initial Catalog=LibraryReservationSystem;Integrated Security=True;Connect Timeout=30"; using (SqlConnection connection = new SqlConnection(connectionString)) { connection.Open(); string commandText = @"SELECT AccountType,* FROM Account WHERE AccountType LIKE @input ESCAPE '\'"; using (SqlCommand command = new SqlCommand(commandText, connection)) { command.CommandType = System.Data.CommandType.Text; command.Parameters.AddWithValue("@input", "%" + searchValue + "%"); using (SqlDataReader reader = command.ExecuteReader()) { if (reader.HasRows) { while (reader.Read()) { test = reader.GetString(0); } } } } } return test; } private static string CustomFormat(string input) { input = input.Replace(@"%", @"\%"); input = input.Replace(@"[", @"\["); input = input.Replace(@"]", @"\]"); input = input.Replace(@"_", @"\_"); //input = input.Replace(@"\", @"\\"); return input; } 

参考：

1. 如何在LIKE子句中转义方括号？
2. 如何转义字符串以与SQL Server中的LIKE运算符一起使用？

Answer 1

像这样修改CustomFormat方法：

 private static string CustomFormat(string input) { input = input.Replace(@"\", @"\\"); input = input.Replace(@"%", @"\%"); input = input.Replace(@"[", @"\["); input = input.Replace(@"]", @"\]"); input = input.Replace(@"_", @"\_"); return input; } 

Answer 2

用于LIKE处理的C＃代码

  public static string WildcardFormatSpecialCharacter(string source) { string formattedResult = string.Empty; if (!String.IsNullOrEmpty(source)) { //Escape the escape character formattedResult = source.Replace(DataLayerConstants.EscapeCharacter, DataLayerConstants.EscapeCharacterWithEscape); //The % formattedResult = formattedResult.Replace(DataLayerConstants.Percentage, DataLayerConstants.PercentageWithEscape); //The [ formattedResult = formattedResult.Replace(DataLayerConstants.OpenSqaureBracket, DataLayerConstants.OpenSqaureBracketWithEscape); //The ] formattedResult = formattedResult.Replace(DataLayerConstants.CloseSqaureBracket, DataLayerConstants.CloseSqaureBracketWithEscape); //The _ formattedResult = formattedResult.Replace(DataLayerConstants.Underscore, DataLayerConstants.UnderscoreWithEscape); } return formattedResult; } public const string EscapeCharacter = @"\"; public const string EscapeCharacterWithEscape = @"\\"; public const string Percentage = "%"; public const string PercentageWithEscape = @"\%"; public const string OpenSqaureBracket = "["; public const string OpenSqaureBracketWithEscape = @"\["; public const string CloseSqaureBracket = "]"; public const string CloseSqaureBracketWithEscape = @"\]"; public const string Underscore = "_"; public const string UnderscoreWithEscape = @"\_"; 

其他要检查的内容在SQL查询中使用REPLACE表示换行符/回车符