refactor: db connectors

src/datasource-zabbix/zabbix/connectors/sql/mysql.js

@@ -0,0 +1,43 @@
+/**
+ * MySQL queries
+ */
+
+function historyQuery(itemids, table, timeFrom, timeTill, intervalSec, aggFunction) {
+  let time_expression = `clock DIV ${intervalSec} * ${intervalSec}`;
+  let query = `
+    SELECT CAST(itemid AS CHAR) AS metric, ${time_expression} AS time_sec, ${aggFunction}(value) AS value
+    FROM ${table}
+    WHERE itemid IN (${itemids})
+      AND clock > ${timeFrom} AND clock < ${timeTill}
+    GROUP BY ${time_expression}, metric
+    ORDER BY time_sec ASC
+  `;
+  return query;
+}
+
+function trendsQuery(itemids, table, timeFrom, timeTill, intervalSec, aggFunction, valueColumn) {
+  let time_expression = `clock DIV ${intervalSec} * ${intervalSec}`;
+  let query = `
+    SELECT CAST(itemid AS CHAR) AS metric, ${time_expression} AS time_sec, ${aggFunction}(${valueColumn}) AS value
+    FROM ${table}
+    WHERE itemid IN (${itemids})
+      AND clock > ${timeFrom} AND clock < ${timeTill}
+    GROUP BY ${time_expression}, metric
+    ORDER BY time_sec ASC
+  `;
+  return query;
+}
+
+const TEST_QUERY = `SELECT CAST(itemid AS CHAR) AS metric, clock AS time_sec, value_avg AS value FROM trends_uint LIMIT 1`;
+
+function testQuery() {
+  return TEST_QUERY;
+}
+
+const mysql = {
+  historyQuery,
+  trendsQuery,
+  testQuery
+};
+
+export default mysql;