RowsPtr
EngineBase::select(const Expression &what,
const Expression &from, const Expression &where,
const Expression &group_by, const Expression &having,
const Expression &order_by, int max_rows, bool for_update)
{
SqlResultSet rs = select_iter(SelectExpr(what).from_(from).
where_(where).group_by_(group_by).having_(having).
order_by_(order_by).for_update(for_update));
RowsPtr rows(new Rows);
copy_no_more_than_n(rs.begin(), rs.end(), max_rows,
back_inserter(*rows));
return rows;
}
Strings
OracleDialect::get_tables(SqlConnection &conn)
{
Strings table;
auto_ptr<SqlCursor> cursor = conn.new_cursor();
String query = _T("SELECT table_name FROM all_tables where owner = (SELECT USER FROM DUAL)");
cursor->prepare(query);
Values params;
SqlResultSet rs = cursor->exec(params);
for (SqlResultSet::iterator i = rs.begin(); i != rs.end(); ++i)
{
table.push_back((*i)[0].second.as_string());
}
return table;
}
ColumnsInfo
OracleDialect::get_columns(SqlConnection &conn, const String &table)
{
ColumnsInfo ci;
auto_ptr<SqlCursor> cursor = conn.new_cursor();
String query = _T("SELECT col.column_name, col.data_type, col.data_length, col.nullable, col.data_default FROM ALL_TAB_COLUMNS col WHERE col.TABLE_NAME = '") +table
+ _T("' AND col.OWNER = (SELECT USER FROM DUAL)");
cursor->prepare(query);
Values params;
SqlResultSet rs = cursor->exec(params);
for (SqlResultSet::iterator i = rs.begin(); i != rs.end(); ++i)
{
ColumnInfo x;
for (Row::const_iterator j = i->begin(); j != i->end(); ++j)
{
if (_T("COLUMN_NAME") == j->first)
{
x.name = str_to_upper(j->second.as_string());
}
else if (_T("DATA_TYPE") == j->first)
{
x.type = str_to_upper(j->second.as_string());
if (_T("VARCHAR2") == x.type)
{
++j;
if (_T("DATA_LENGTH") == j->first)
{
x.size = j->second.as_integer();
}
}
}
else if (_T("NULLABLE") == j->first)
{
x.notnull = _T("N") == j->second.as_string();
}
else if (_T("DATA_DEFAULT") == j->first)
{
if (!j->second.is_null())
x.default_value = j->second.as_string();
}
}
ci.push_back(x);
}
String querypk = _T("SELECT cols.position FROM all_constraints cons, all_cons_columns cols WHERE cols.table_name = '") +table+ _T("' AND cons.constraint_type = 'P' AND cons.constraint_name = cols.constraint_name AND cons.owner = cols.owner");
cursor->prepare(querypk);
Values paramspk;
SqlResultSet rspk = cursor->exec(paramspk);
for (SqlResultSet::iterator i = rspk.begin(); i != rspk.end(); ++i)
{
Row::const_iterator j = i->begin();
if (j != i-> end())
{
ci[j->second.as_integer() - 1].pk = true;
}
}
String q2 =_T("SELECT substr(c_src.COLUMN_NAME, 1, 20) as SRC_COLUMN, c_dest.TABLE_NAME as DEST_TABLE, substr(c_dest.COLUMN_NAME, 1, 20) as DEST_COLUMN FROM ALL_CONSTRAINTS c_list, ALL_CONS_COLUMNS c_src, ALL_CONS_COLUMNS c_dest WHERE c_list.CONSTRAINT_NAME = c_src.CONSTRAINT_NAME AND c_list.R_CONSTRAINT_NAME = c_dest.CONSTRAINT_NAME AND c_list.CONSTRAINT_TYPE = 'R' AND c_src.TABLE_NAME = '")
+ table + _T("'");
cursor->prepare(q2);
Values params2;
SqlResultSet rs2 = cursor->exec(params2);
for (SqlResultSet::iterator i = rs2.begin(); i != rs2.end(); ++i)
{
String fk_column, fk_table, fk_table_key;
for (Row::const_iterator j = i->begin(); j != i->end(); ++j)
{
if (_T("DEST_TABLE") == j->first)
{
if (!j->second.is_null())
{
fk_table = j->second.as_string();
}
}
else if (_T("DEST_COLUMN") == j->first)
{
if (!j->second.is_null())
{
fk_table_key = j->second.as_string();
}
}
else if (_T("SRC_COLUMN") == j->first)
{
if (!j->second.is_null())
{
fk_column = j->second.as_string();
}
}
}
for (ColumnsInfo::iterator k = ci.begin(); k != ci.end(); ++k)
{
if (k->name == fk_column)
{
k->fk_table = fk_table;
k->fk_table_key = fk_table_key;
break;
}
}
}
return ci;
}
