2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=========================================================
21 package org.onap.dmaap.dbcapi.database;
23 import java.lang.reflect.*;
25 import java.sql.Connection;
26 import java.sql.DatabaseMetaData;
27 import java.sql.ResultSet;
28 import java.sql.SQLException;
29 import java.util.HashMap;
31 import java.util.Vector;
33 class TableHandler<C> {
34 protected ConnectionFactory cf;
35 protected boolean haskey;
36 protected String delstmt;
37 protected String insorreplstmt;
38 protected String getstmt;
39 protected String liststmt;
40 protected String initstmt;
41 protected Class<C> cls;
42 protected DBFieldHandler[] fields;
43 private static Map<String, Map<String, DBFieldHandler.SqlOp>> exceptions = new HashMap<>();
44 private String select = "SELECT ";
45 private String from = " FROM ";
47 protected TableHandler(Class<C> cls, String tabname, String keyname) throws Exception {
48 this(ConnectionFactory.getDefaultInstance(), cls, tabname, keyname);
50 protected TableHandler(ConnectionFactory cf, Class<C> cls, String tabname, String keyname) throws Exception {
55 setup(c.getMetaData(), cls, tabname, keyname);
63 public static void setSpecialCase(String dbtabname, String dbfldname, DBFieldHandler.SqlOp handler) {
64 Map<String, DBFieldHandler.SqlOp> m = exceptions.get(dbtabname);
67 exceptions.put(dbtabname, m);
69 m.put(dbfldname, handler);
71 public static DBFieldHandler.SqlOp getSpecialCase(String dbtabname, String dbfldname) {
72 Map<String, DBFieldHandler.SqlOp> m = exceptions.get(dbtabname);
74 return(m.get(dbfldname));
79 private void setup(DatabaseMetaData dmd, Class<C> cls, String tabname, String keyname) throws Exception {
81 Vector<DBFieldHandler> h = new Vector<>();
82 String qualifiedTableName = String.format( "%s.%s", cf.getSchema(), tabname );
83 ResultSet rs = dmd.getColumns("", cf.getSchema(), tabname, null);
84 StringBuilder sb1 = new StringBuilder();
85 StringBuilder sb2 = new StringBuilder();
86 StringBuilder sb3 = new StringBuilder();
89 if (!rs.getString(3).equals(tabname)) {
92 String cname = rs.getString(4);
93 if (cname.equals(keyname)) {
97 sb1.append(", ").append(cname);
99 sb3.append(", EXCLUDED.").append(cname);
101 h.add(new DBFieldHandler(cls, cname, count, getSpecialCase(tabname, cname)));
104 throw new SQLException("Table " + tabname + " not found");
106 String clist = sb1.substring(2);
107 String qlist = sb2.substring(2);
108 String elist = sb3.substring(2);
109 if (keyname != null && !haskey) {
110 throw new SQLException("Table " + tabname + " does not have key column " + keyname + " not found");
114 h.add(new DBFieldHandler(cls, keyname, count, getSpecialCase(tabname, keyname)));
115 delstmt = "DELETE FROM " + qualifiedTableName + " WHERE " + keyname + " = ?";
116 insorreplstmt = "INSERT INTO " + qualifiedTableName + " (" + clist + ", " + keyname + ") VALUES (" + qlist + ", ?) ON CONFLICT(" + keyname + ") DO UPDATE SET (" + clist + ") = (" + elist + ")";
117 getstmt = select + clist + ", " + keyname + from + qualifiedTableName + " WHERE " + keyname + " = ?";
118 liststmt = select + clist + ", " + keyname + from + qualifiedTableName;
120 delstmt = "DELETE FROM " + qualifiedTableName;
121 initstmt = "INSERT INTO " + qualifiedTableName + " (" + clist + ") VALUES (" + qlist + ")";
122 insorreplstmt = "UPDATE " + qualifiedTableName + " SET (" + clist + ") = (" + qlist + ")";
123 getstmt = select + clist + ", " + keyname + from + qualifiedTableName;
125 fields = h.toArray(new DBFieldHandler[h.size()]);