public FbScript(string script)
{
if (script == null)
{
throw new ArgumentNullException();
}
_results = new FbStatementCollection();
_parser = new SqlStringParser(script);
_parser.Tokens = new[] { ";" };
}
/// <summary>
/// Updates the connection string with the data parsed from the parameter and opens a connection
/// to the database.
/// </summary>
/// <param name="connectDbStatement"></param>
private async Task ConnectToDatabaseAsync(string connectDbStatement, CancellationToken cancellationToken = default)
{
// CONNECT 'filespec'
// [USER 'username']
// [PASSWORD 'password']
// [CACHE int]
// [ROLE 'rolename']
var parser = new SqlStringParser(connectDbStatement);
parser.Tokens = StandardParseTokens;
using (var enumerator = parser.Parse().GetEnumerator())
{
enumerator.MoveNext();
if (enumerator.Current.Text.ToUpperInvariant() != "CONNECT")
{
throw new ArgumentException("Malformed isql CONNECT statement. Expected keyword CONNECT but something else was found.");
}
enumerator.MoveNext();
_connectionString.Database = enumerator.Current.Text.Replace("'", string.Empty);
while (enumerator.MoveNext())
{
switch (enumerator.Current.Text.ToUpperInvariant())
{
case "USER":
enumerator.MoveNext();
_connectionString.UserID = enumerator.Current.Text.Replace("'", string.Empty);
break;
case "PASSWORD":
enumerator.MoveNext();
_connectionString.Password = enumerator.Current.Text.Replace("'", string.Empty);
break;
case "CACHE":
enumerator.MoveNext();
break;
case "ROLE":
enumerator.MoveNext();
_connectionString.Role = enumerator.Current.Text.Replace("'", string.Empty);
break;
default:
throw new ArgumentException("Unexpected token '" + enumerator.Current.Text + "' on isql CONNECT statement.");
}
}
}
_requiresNewConnection = true;
await ProvideConnectionAsync(cancellationToken).ConfigureAwait(false);
}
/// <summary>
/// Parses the isql statement SET NAMES and sets the character set to current connection string.
/// </summary>
/// <param name="setNamesStatement">The set names statement.</param>
private void SetNames(string setNamesStatement)
{
// SET NAMES charset
var parser = new SqlStringParser(setNamesStatement);
parser.Tokens = StandardParseTokens;
using (var enumerator = parser.Parse().GetEnumerator())
{
enumerator.MoveNext();
if (enumerator.Current.Text.ToUpperInvariant() != "SET")
{
throw new ArgumentException("Malformed isql SET statement. Expected keyword SET but something else was found.");
}
enumerator.MoveNext(); // NAMES
enumerator.MoveNext();
_connectionString.Charset = enumerator.Current.Text;
}
}
/// <summary>
/// Parses the isql statement SET SQL DIALECT and sets the dialect set to current connection string.
/// </summary>
/// <param name="setSqlDialectStatement">The set sql dialect statement.</param>
private void SetSqlDialect(string setSqlDialectStatement)
{
// SET SQL DIALECT dialect
var parser = new SqlStringParser(setSqlDialectStatement);
parser.Tokens = StandardParseTokens;
using (var enumerator = parser.Parse().GetEnumerator())
{
enumerator.MoveNext();
if (enumerator.Current.Text.ToUpperInvariant() != "SET")
{
throw new ArgumentException("Malformed isql SET statement. Expected keyword SET but something else was found.");
}
enumerator.MoveNext(); // SQL
enumerator.MoveNext(); // DIALECT
enumerator.MoveNext();
int.TryParse(enumerator.Current.Text, out var dialect);
_connectionString.Dialect = dialect;
}
}
/// <summary>
/// Parses the isql statement SET AUTODDL and sets the character set to current connection string.
/// </summary>
/// <param name="setAutoDdlStatement">The set names statement.</param>
private void SetAutoDdl(string setAutoDdlStatement, ref bool autoCommit)
{
// SET AUTODDL [ON | OFF]
var parser = new SqlStringParser(setAutoDdlStatement);
parser.Tokens = StandardParseTokens;
using (var enumerator = parser.Parse().GetEnumerator())
{
enumerator.MoveNext();
if (enumerator.Current.Text.ToUpperInvariant() != "SET")
{
throw new ArgumentException("Malformed isql SET statement. Expected keyword SET but something else was found.");
}
enumerator.MoveNext(); // AUTO
if (enumerator.MoveNext())
{
var onOff = enumerator.Current.Text.ToUpperInvariant();
if (onOff == "ON")
{
autoCommit = true;
}
else if (onOff == "OFF")
{
autoCommit = false;
}
else
{
throw new ArgumentException("Expected the ON or OFF but something else was found.");
}
}
else
{
autoCommit = !autoCommit;
}
}
}
/// <summary>
/// Parses the isql statement CREATE DATABASE and creates the database and opens a connection to the recently created database.
/// </summary>
/// <param name="createDatabaseStatement">The create database statement.</param>
private async Task CreateDatabaseAsync(string createDatabaseStatement, CancellationToken cancellationToken = default)
{
// CREATE {DATABASE | SCHEMA} 'filespec'
// [USER 'username' [PASSWORD 'password']]
// [PAGE_SIZE [=] int]
// [LENGTH [=] int [PAGE[S]]]
// [DEFAULT CHARACTER SET charset]
// [<secondary_file>];
var pageSize = 0;
var parser = new SqlStringParser(createDatabaseStatement);
parser.Tokens = StandardParseTokens;
using (var enumerator = parser.Parse().GetEnumerator())
{
enumerator.MoveNext();
if (enumerator.Current.Text.ToUpperInvariant() != "CREATE")
{
throw new ArgumentException("Malformed isql CREATE statement. Expected keyword CREATE but something else was found.");
}
enumerator.MoveNext(); // {DATABASE | SCHEMA}
enumerator.MoveNext();
_connectionString.Database = enumerator.Current.Text.Replace("'", string.Empty);
while (enumerator.MoveNext())
{
switch (enumerator.Current.Text.ToUpperInvariant())
{
case "USER":
enumerator.MoveNext();
_connectionString.UserID = enumerator.Current.Text.Replace("'", string.Empty);
break;
case "PASSWORD":
enumerator.MoveNext();
_connectionString.Password = enumerator.Current.Text.Replace("'", string.Empty);
break;
case "PAGE_SIZE":
enumerator.MoveNext();
if (enumerator.Current.Text == "=")
{
enumerator.MoveNext();
}
int.TryParse(enumerator.Current.Text, out pageSize);
break;
case "DEFAULT":
enumerator.MoveNext();
if (enumerator.Current.Text.ToUpperInvariant() != "CHARACTER")
{
throw new ArgumentException("Expected the keyword CHARACTER but something else was found.");
}
enumerator.MoveNext();
if (enumerator.Current.Text.ToUpperInvariant() != "SET")
{
throw new ArgumentException("Expected the keyword SET but something else was found.");
}
enumerator.MoveNext();
_connectionString.Charset = enumerator.Current.Text;
break;
}
}
}
await FbConnection.CreateDatabaseAsync(_connectionString.ToString(), pageSize : pageSize, cancellationToken : cancellationToken).ConfigureAwait(false);
_requiresNewConnection = true;
await ProvideConnectionAsync(cancellationToken).ConfigureAwait(false);
}
