oracle: bulk inserter

plugins/dbgate-plugin-oracle/src/backend/createOracleBulkInsertStream.js

@@ -0,0 +1,38 @@
+const { createBulkInsertStreamBase } = require('dbgate-tools');
+const _ = require('lodash');
+
+/**
+ *
+ * @param {import('dbgate-types').EngineDriver} driver
+ */
+function createOracleBulkInsertStream(driver, stream, pool, name, options) {
+  const fullNameQuoted = name.schemaName
+    ? `${driver.dialect.quoteIdentifier(name.schemaName)}.${driver.dialect.quoteIdentifier(name.pureName)}`
+    : driver.dialect.quoteIdentifier(name.pureName);
+
+  const writable = createBulkInsertStreamBase(driver, stream, pool, name, {
+    ...options,
+    // this is really not used, send method below is used instead
+    commitAfterInsert: true,
+  });
+
+  writable.send = async () => {
+    const dmp = driver.createDumper();
+    dmp.putRaw(`INSERT INTO ${fullNameQuoted} (`);
+    dmp.putCollection(',', writable.columnNames, col => dmp.putRaw(driver.dialect.quoteIdentifier(col)));
+    dmp.putRaw(')\n VALUES (\n');
+    dmp.put(
+      '%,s',
+      writable.columnNames.map((c, i) => `:C${i}`)
+    );
+    dmp.putRaw(')');
+
+    const rows = writable.buffer.map(row => _.mapKeys(row, (v, k) => `c${writable.columnNames.indexOf(k)}`));
+    await pool.executeMany(dmp.s, rows, { autoCommit: true });
+    writable.buffer = [];
+  };
+
+  return writable;
+}
+
+module.exports = createOracleBulkInsertStream;