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https://issues.apache.org/jira/browse/NIFI-2157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15380985#comment-15380985
]
ASF GitHub Bot commented on NIFI-2157:
--------------------------------------
Github user JPercivall commented on a diff in the pull request:
https://github.com/apache/nifi/pull/645#discussion_r71073650
--- Diff:
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/AbstractDatabaseFetchProcessor.java
---
@@ -0,0 +1,361 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.nifi.processors.standard;
+
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.dbcp.DBCPService;
+import org.apache.nifi.processor.AbstractSessionFactoryProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.processors.standard.db.DatabaseAdapter;
+
+import java.io.IOException;
+import java.math.BigDecimal;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.sql.Timestamp;
+import java.text.DecimalFormat;
+import java.text.ParseException;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.ServiceLoader;
+import java.util.Set;
+
+import static java.sql.Types.ARRAY;
+import static java.sql.Types.BIGINT;
+import static java.sql.Types.BINARY;
+import static java.sql.Types.BIT;
+import static java.sql.Types.BLOB;
+import static java.sql.Types.BOOLEAN;
+import static java.sql.Types.CLOB;
+import static java.sql.Types.DECIMAL;
+import static java.sql.Types.DOUBLE;
+import static java.sql.Types.FLOAT;
+import static java.sql.Types.INTEGER;
+import static java.sql.Types.LONGVARBINARY;
+import static java.sql.Types.NUMERIC;
+import static java.sql.Types.CHAR;
+import static java.sql.Types.DATE;
+import static java.sql.Types.LONGNVARCHAR;
+import static java.sql.Types.LONGVARCHAR;
+import static java.sql.Types.NCHAR;
+import static java.sql.Types.NVARCHAR;
+import static java.sql.Types.REAL;
+import static java.sql.Types.ROWID;
+import static java.sql.Types.SMALLINT;
+import static java.sql.Types.TIME;
+import static java.sql.Types.TIMESTAMP;
+import static java.sql.Types.TINYINT;
+import static java.sql.Types.VARBINARY;
+import static java.sql.Types.VARCHAR;
+
+/**
+ * A base class for common code shared by processors that fetch RDBMS data.
+ */
+public abstract class AbstractDatabaseFetchProcessor extends
AbstractSessionFactoryProcessor {
+
+ // Relationships
+ public static final Relationship REL_SUCCESS = new
Relationship.Builder()
+ .name("success")
+ .description("Successfully created FlowFile from SQL query
result set.")
+ .build();
+
+ protected Set<Relationship> relationships;
+
+ // Properties
+ public static final PropertyDescriptor DBCP_SERVICE = new
PropertyDescriptor.Builder()
+ .name("Database Connection Pooling Service")
+ .description("The Controller Service that is used to obtain a
connection to the database.")
+ .required(true)
+ .identifiesControllerService(DBCPService.class)
+ .build();
+
+ public static final PropertyDescriptor TABLE_NAME = new
PropertyDescriptor.Builder()
+ .name("Table Name")
+ .description("The name of the database table to be queried.")
+ .required(true)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor COLUMN_NAMES = new
PropertyDescriptor.Builder()
+ .name("Columns to Return")
+ .description("A comma-separated list of column names to be
used in the query. If your database requires "
+ + "special treatment of the names (quoting, e.g.),
each name should include such treatment. If no "
+ + "column names are supplied, all columns in the
specified table will be returned.")
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor MAX_VALUE_COLUMN_NAMES = new
PropertyDescriptor.Builder()
+ .name("Maximum-value Columns")
+ .description("A comma-separated list of column names. The
processor will keep track of the maximum value "
--- End diff --
This description should include details regarding what the functionality is
when no columns are listed.
> Add GenerateTableFetch processor
> --------------------------------
>
> Key: NIFI-2157
> URL: https://issues.apache.org/jira/browse/NIFI-2157
> Project: Apache NiFi
> Issue Type: Sub-task
> Reporter: Matt Burgess
> Assignee: Matt Burgess
> Fix For: 1.0.0
>
>
> This processor would presumably operate like QueryDatabaseTable, except it
> will contain a "Partition Size" property, and rather than executing the SQL
> statement(s) to fetch rows, it would generate flow files containing SQL
> statements that will select rows from a table. If the partition size is
> indicated, then the SELECT statements will refer to a range of rows, such
> that each statement will grab only a portion of the table. If max-value
> columns are specified, then only rows whose observed values for those columns
> exceed the current maximum will be fetched (i.e. like QueryDatabaseTable).
> These flow files (due to NIFI-1973) can be passed to ExecuteSQL processors
> for the actual fetching of rows, and ExecuteSQL can be distributed across
> cluster nodes and/or multiple tasks. These features enable distributed
> incremental fetching of rows from database table(s).
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