Implemented explain for postgresql

ARPA-SIMC · Nov 11, 2015 · 9fd88f8 · 9fd88f8
1 parent 3cac7f5
commit 9fd88f8
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diff --git a/dballe/db/postgresql/driver.cc b/dballe/db/postgresql/driver.cc
@@ -301,6 +301,19 @@ void Driver::exec_no_data(const std::string& query)
     conn.exec_no_data(query);
 }
 
+void Driver::explain(const std::string& query)
+{
+    using namespace dballe::db::postgresql;
+
+    string explain_query = "EXPLAIN ";
+    explain_query += query;
+
+    fprintf(stderr, "%s\n", explain_query.c_str());
+    Result res = conn.exec(explain_query);
+    for (unsigned row = 0; row < res.rowcount(); ++row)
+        fprintf(stderr, "  %s\n", res.get_string(row, 0));
+}
+
 }
 }
 }
diff --git a/dballe/db/postgresql/driver.h b/dballe/db/postgresql/driver.h
@@ -46,6 +46,7 @@ struct Driver : public sql::Driver
     void delete_tables_v6() override;
     void vacuum_v6() override;
     void exec_no_data(const std::string& query) override;
+    void explain(const std::string& query) override;
 };
 
 }