// get the LIKE string for a given string, based on where the like wildcards should be
private static string GetWildcardedString(string value, LikeLocation loc)
{
switch (loc)
{
case LikeLocation.Before:
return("%" + value);
case LikeLocation.After:
return(value + "%");
case LikeLocation.Both:
return("%" + value + "%");
default:
throw new ArgumentException("invalid LikeLocation provided!");
}
}
public int ExistLike(string TableName, string FieldName, string FieldValue, LikeLocation LL)
{
int res = 0;
switch (LL)
{
case LikeLocation.Start:
res = (int)ExecScalar("select Count(*) as NumberOfRows From " + TableName + " Where " + FieldName + "Like %'" + FieldValue + "'");
break;
case LikeLocation.End:
res = (int)ExecScalar("select Count(*) as NumberOfRows From " + TableName + " Where " + FieldName + "Like '" + FieldValue + "'%");
break;
case LikeLocation.Any:
res = (int)ExecScalar("select Count(*) as NumberOfRows From " + TableName + " Where " + FieldName + "Like %'" + FieldValue + "'%");
break;
}
return(res);
}
// get the LIKE string for a given string, based on where the like wildcards should be
private static string GetWildcardedString(string value, LikeLocation loc)
{
switch (loc)
{
case LikeLocation.Before:
return "%" + value;
case LikeLocation.After:
return value + "%";
case LikeLocation.Both:
return "%" + value + "%";
default:
throw new ArgumentException("invalid LikeLocation provided!");
}
}
// perform a LIKE query on a given database for a given column/input string
public static DataTable ReadLikeQuery(string table, string column, string value, LikeLocation loc)
{
value = value.Replace("'", "''");
DataTable dt = new DataTable();
if (_dbConnection.State == ConnectionState.Open)
{
_dbConnection.Close();
}
_dbConnection.Open();
SQLiteCommand com =
new SQLiteCommand("select * from " + table + " where " + column + " LIKE '" + GetWildcardedString(value, loc) + "'", _dbConnection);
dt.Load(com.ExecuteReader());
_dbConnection.Close();
return dt;
}
// perform a LIKE query on a given database for a given column/input string
public static DataTable ReadLikeQuery(string table, string column, string value, LikeLocation loc)
{
value = value.Replace("'", "''");
DataTable dt = new DataTable();
if (_dbConnection.State == ConnectionState.Open)
{
_dbConnection.Close();
}
_dbConnection.Open();
SQLiteCommand com =
new SQLiteCommand("select * from " + table + " where " + column + " LIKE '" + GetWildcardedString(value, loc) + "'", _dbConnection);
dt.Load(com.ExecuteReader());
_dbConnection.Close();
return(dt);
}
