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2018-11-16 Fred Gleason <fredg@paravelsystems.com>

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* Refactored schema modification routines in rddbmgr(8) to check
	for existence of a field before dropping it.
This commit is contained in:
Fred Gleason
2018-11-16 09:17:11 -05:00
parent fa7918d158
commit c1ba5c92a9
5 changed files with 426 additions and 726 deletions
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34
utils/rddbmgr/rddbmgr.cpp
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@@ -400,6 +400,40 @@ bool MainObject::DropTable(const QString &tbl_name,QString *err_msg) const
}
bool MainObject::ColumnExists(const QString &tbl_name,
const QString &col_name) const
{
QString sql;
RDSqlQuery *q;
bool ret=false;
sql=QString("select * from INFORMATION_SCHEMA.COLUMNS where ")+
"TABLE_SCHEMA=\""+db_config->mysqlDbname()+"\" && "+
"TABLE_NAME=\""+tbl_name+"\" && "+
"COLUMN_NAME=\""+col_name+"\"";
q=new RDSqlQuery(sql,false);
ret=q->first();
delete q;
return ret;
}
bool MainObject::DropColumn(const QString &tbl_name,const QString &col_name,
QString *err_msg) const
{
QString sql;
bool ret=false;
if(ColumnExists(tbl_name,col_name)) {
sql=QString("alter table `")+tbl_name+"` drop column "+col_name;
ret=RDSqlQuery::apply(sql,err_msg);
}
return ret;
}
int main(int argc,char *argv[])
{
QApplication a(argc,argv,false);