/// <summary>
/// first token must be
/// <see cref="MySqlToken.SysVar" />
/// </summary>
/// <exception cref="System.SqlSyntaxErrorException" />
public virtual SysVarPrimary SystemVariale()
{
SysVarPrimary sys;
var scope = VariableScope.Session;
var str = lexer.GetStringValue();
var strUp = lexer.GetStringValueUppercase();
Match(MySqlToken.SysVar);
var si = specialIdentifiers.GetValue(strUp);
if (si != SpecialIdentifier.None)
{
switch (si)
{
case SpecialIdentifier.Global:
{
scope = VariableScope.Global;
goto case SpecialIdentifier.Session;
}
case SpecialIdentifier.Session:
case SpecialIdentifier.Local:
{
Match(MySqlToken.PuncDot);
str = lexer.GetStringValue();
strUp = lexer.GetStringValueUppercase();
Match(MySqlToken.Identifier);
sys = new SysVarPrimary(scope, str, strUp);
sys.SetCacheEvalRst(cacheEvalRst);
return sys;
}
}
}
sys = new SysVarPrimary(scope, str, strUp);
sys.SetCacheEvalRst(cacheEvalRst);
return sys;
}
/// <exception cref="System.SqlSyntaxErrorException" />
private object VarAssign()
{
VariableExpression var;
IExpression expr;
var scope = VariableScope.Session;
switch (lexer.Token())
{
case MySqlToken.Identifier:
{
var explictScope = false;
var si = specialIdentifiers.GetValue(lexer.GetStringValueUppercase());
if (si != SpecialIdentifier.None)
{
switch (si)
{
case SpecialIdentifier.Transaction:
{
return SetMTSSetTransactionStatement(VariableScope.None);
}
case SpecialIdentifier.Global:
{
scope = VariableScope.Global;
goto case SpecialIdentifier.Session;
}
case SpecialIdentifier.Session:
case SpecialIdentifier.Local:
{
explictScope = true;
lexer.NextToken();
goto default;
}
default:
{
break;
}
}
}
if (explictScope
&& specialIdentifiers.GetValue(lexer.GetStringValueUppercase()) == SpecialIdentifier.Transaction)
{
return SetMTSSetTransactionStatement(scope);
}
var = new SysVarPrimary(scope, lexer.GetStringValue(), lexer.GetStringValueUppercase());
Match(MySqlToken.Identifier);
break;
}
case MySqlToken.SysVar:
{
var = SystemVariale();
break;
}
case MySqlToken.UsrVar:
{
var = new UsrDefVarPrimary(lexer.GetStringValue());
lexer.NextToken();
break;
}
default:
{
throw Err("unexpected token for SET statement");
}
}
Match(MySqlToken.OpEquals, MySqlToken.OpAssign);
expr = exprParser.Expression();
return new Pair<VariableExpression, IExpression>(var, expr);
}
public virtual void Visit(SysVarPrimary node)
{
}