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Subject [GitHub] [incubator-hudi] leesf commented on a change in pull request #1200: [HUDI-514] A schema provider to get metadata through Jdbc
Date Sun, 09 Feb 2020 13:37:10 GMT
leesf commented on a change in pull request #1200: [HUDI-514] A schema provider to get metadata
through Jdbc
URL: https://github.com/apache/incubator-hudi/pull/1200#discussion_r376784592
 
 

 ##########
 File path: hudi-utilities/src/main/java/org/apache/hudi/utilities/UtilHelpers.java
 ##########
 @@ -236,4 +250,57 @@ public static TypedProperties readConfig(InputStream in) throws IOException
{
     defaults.load(in);
     return defaults;
   }
+
+  /***
+   * call spark function get the schema through jdbc.
+   * @param options
+   * @return
+   * @throws Exception
+   */
+  public static Schema getSchema(Map<String, String> options) throws Exception {
+    scala.collection.immutable.Map<String, String> ioptions = toScalaImmutableMap(options);
+    JDBCOptions jdbcOptions = new JDBCOptions(ioptions);
+    Connection conn = JdbcUtils.createConnectionFactory(jdbcOptions).apply();
+    String url = jdbcOptions.url();
+    String table = jdbcOptions.tableOrQuery();
+    JdbcOptionsInWrite jdbcOptionsInWrite = new JdbcOptionsInWrite(ioptions);
+    boolean tableExists = JdbcUtils.tableExists(conn, jdbcOptionsInWrite);
+    if (tableExists) {
+      JdbcDialect dialect = JdbcDialects.get(url);
+      try {
+        PreparedStatement statement = conn.prepareStatement(dialect.getSchemaQuery(table));
+        try {
+          statement.setQueryTimeout(Integer.parseInt(options.get("timeout")));
+          ResultSet rs = statement.executeQuery();
+          try {
+            StructType structType;
+            if (Boolean.parseBoolean(ioptions.get("nullable").get())) {
+              structType = JdbcUtils.getSchema(rs, dialect, true);
+            } else {
+              structType = JdbcUtils.getSchema(rs, dialect, false);
+            }
+            return AvroConversionUtils.convertStructTypeToAvroSchema(structType, table, "hoodie."
+ table);
+          } finally {
+            rs.close();
+          }
+        } finally {
+          statement.close();
+        }
+      } finally {
+        conn.close();
+      }
+    } else {
+      throw new HoodieException(String.format("%s table not exists!", table));
+    }
+  }
+
+  @SuppressWarnings("unchecked")
+  private static <K, V> scala.collection.immutable.Map<K, V> toScalaImmutableMap(java.util.Map<K,
V> javaMap) {
 
 Review comment:
   also is the method(`toScalaImmutableMap`) copied from other projects or implemented on
our own?

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