internal override string CreateSqlString(CommandFactory factory, bool isFullName, CreateSqlState state)
{
string sql = null;
DataFieldInfo leftInfo = _left as DataFieldInfo;
DataFieldInfo rightInfo = _right as DataFieldInfo;
if (!Object.Equals(leftInfo, null) && !Object.Equals(rightInfo, null))
{
string leftSql = leftInfo.CreateSqlString(factory, isFullName, state);
string rightSql = rightInfo.CreateSqlString(factory, isFullName, state);
sql = factory.CreateSingleParamSql(leftSql, _predicate, rightSql);
}
else if (!Object.Equals(leftInfo, null))
{
string leftSql = leftInfo.CreateSqlString(factory, isFullName, state);
object right = LambdaExpressionExtend.ConvertLambdaObject(_right);
if (Object.Equals(right, null))
{
bool predicate;
if (_predicate == QueryPredicate.Eq)
{
predicate = true;
}
else if (_predicate == QueryPredicate.NotEq)
{
predicate = false;
}
else
{
throw new LightDataException(string.Format(SR.UnsupportPredicate, _predicate, "null"));
}
sql = factory.CreateNullQuerySql(leftSql, predicate);
}
else if (right is bool)
{
bool predicate;
if (_predicate == QueryPredicate.Eq)
{
predicate = true;
}
else if (_predicate == QueryPredicate.NotEq)
{
predicate = false;
}
else
{
throw new LightDataException(string.Format(SR.UnsupportPredicate, _predicate, "bool"));
}
bool ret = (bool)right;
sql = factory.CreateBooleanQuerySql(leftSql, ret, predicate, false);
}
else
{
string name = state.AddDataParameter(factory, leftInfo.ToParameter(right));
sql = factory.CreateSingleParamSql(leftSql, _predicate, name);
}
}
else if (!Object.Equals(rightInfo, null))
{
string rightSql = rightInfo.CreateSqlString(factory, isFullName, state);
object left = LambdaExpressionExtend.ConvertLambdaObject(_left);
if (Object.Equals(left, null))
{
bool predicate;
if (_predicate == QueryPredicate.Eq)
{
predicate = true;
}
else if (_predicate == QueryPredicate.NotEq)
{
predicate = false;
}
else
{
throw new LightDataException(string.Format(SR.UnsupportPredicate, _predicate, "null"));
}
sql = factory.CreateNullQuerySql(rightSql, predicate);
}
else if (left is bool)
{
bool predicate;
if (_predicate == QueryPredicate.Eq)
{
predicate = true;
}
else if (_predicate == QueryPredicate.NotEq)
{
predicate = false;
}
else
{
throw new LightDataException(string.Format(SR.UnsupportPredicate, _predicate, "bool"));
}
bool ret = (bool)left;
sql = factory.CreateBooleanQuerySql(rightSql, ret, predicate, true);
}
else
{
string name = state.AddDataParameter(factory, rightInfo.ToParameter(left));
sql = factory.CreateSingleParamSql(name, _predicate, rightSql);
}
}
else
{
throw new LightDataException(SR.DataFieldContentError);
}
return(sql);
}