annotate src/jdbcpgbackup/Index.java @ 56:62faaba01dd2

fix naml "Watch a video" link
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 18 Oct 2021 20:36:25 -0600
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1 /* Copyright (c) 2012 Tomislav Gountchev <tomi@gountchev.net> */
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2
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3 package jdbcpgbackup;
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4
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5 import java.sql.Connection;
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6 import java.sql.PreparedStatement;
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7 import java.sql.ResultSet;
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8 import java.sql.SQLException;
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9 import java.util.ArrayList;
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10 import java.util.List;
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11
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12 class Index extends DbBackupObject {
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13
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14 static class IndexFactory implements DBOFactory<Index> {
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15
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16 @Override
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17 public Iterable<Index> getDbBackupObjects(Connection con, Schema schema) throws SQLException {
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18 List<Index> indexes = new ArrayList<Index>();
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19 PreparedStatement stmt = null;
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20 try {
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21 stmt = con.prepareStatement(
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22 // "SELECT * FROM pg_indexes WHERE schemaname = ?");
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23 // duplicate the pg_indexes view definition but skipping the primary indexes
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24 "SELECT c.relname AS tablename, i.relname AS indexname, " +
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25 "pg_get_indexdef(i.oid) AS indexdef " +
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26 "FROM pg_index x " +
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27 "JOIN pg_class c ON c.oid = x.indrelid " +
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28 "JOIN pg_class i ON i.oid = x.indexrelid " +
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29 //"LEFT JOIN pg_namespace n ON n.oid = c.relnamespace " +
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30 //"LEFT JOIN pg_tablespace t ON t.oid = i.reltablespace " +
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31 "WHERE c.relkind = 'r'::\"char\" AND i.relkind = 'i'::\"char\" " +
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32 "AND NOT x.indisprimary AND c.relnamespace = ?");
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33 stmt.setInt(1, schema.getOid());
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34 ResultSet rs = stmt.executeQuery();
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35 while (rs.next()) {
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36 indexes.add(new Index(rs.getString("indexname"), schema, rs.getString("tablename"), rs.getString("indexdef")));
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37 }
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38 rs.close();
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39 } finally {
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40 if (stmt != null) stmt.close();
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41 }
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42
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43 /*// too slow, get primary keys from pg_constraint instead, use pg_get_constraintdef()
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44 ZipBackup.timerStart("primary keys");
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45 DatabaseMetaData metaData = con.getMetaData();
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46 rs = metaData.getPrimaryKeys(null, schema.getName(), null);
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47 Map<String,PrimaryKey> pkeys = new HashMap<String,PrimaryKey>();
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48 while (rs.next()) {
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49 String tableName = rs.getString("TABLE_NAME");
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50 String indexName = rs.getString("PK_NAME");
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51 PrimaryKey pkey = pkeys.get(indexName);
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52 if (pkey == null) {
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53 pkey = new PrimaryKey(indexName, schema, tableName);
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54 pkeys.put(indexName, pkey);
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55 }
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56 pkey.columns.put(Integer.valueOf(rs.getInt("KEY_SEQ")), rs.getString("COLUMN_NAME"));
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57 }
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58 rs.close();
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59 indexes.addAll(pkeys.values());
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60 ZipBackup.timerEnd("primary keys");
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61 */
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62 return indexes;
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63 }
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64
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65 @Override
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66 public Index getDbBackupObject(Connection con, String indexName, Schema schema) throws SQLException {
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67 Index index = null;
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68 PreparedStatement stmt = null;
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69 try {
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70 stmt = con.prepareStatement("SELECT * FROM pg_indexes WHERE schemaname = ? " +
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71 "AND indexname = ?");
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72 stmt.setString(1, schema.getName());
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73 stmt.setString(2, indexName);
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74 ResultSet rs = stmt.executeQuery();
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75 if (rs.next()) {
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76 index = new Index(rs.getString("indexname"), schema, rs.getString("tablename"), rs.getString("indexdef"));
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77 } else {
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78 throw new RuntimeException("no such index: " + indexName);
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79 }
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80 rs.close();
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81 } finally {
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82 if (stmt != null) stmt.close();
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83 }
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84 return index;
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85 }
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86 }
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87
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88 static class CachingIndexFactory extends CachingDBOFactory<Index> {
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89
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90 private final Table.CachingTableFactory tableFactory;
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91
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92 protected CachingIndexFactory(Schema.CachingSchemaFactory schemaFactory, Table.CachingTableFactory tableFactory) {
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93 super(schemaFactory);
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94 this.tableFactory = tableFactory;
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95 }
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96
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97 @Override
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98 protected PreparedStatement getAllStatement(Connection con) throws SQLException {
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99 return con.prepareStatement(
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100 "SELECT x.indrelid AS table_oid, i.relname AS indexname, " +
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101 "pg_get_indexdef(i.oid) AS indexdef, " +
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102 "i.relnamespace AS schema_oid " +
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103 "FROM pg_index x " +
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104 "JOIN pg_class i ON i.oid = x.indexrelid " +
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105 "WHERE i.relkind = 'i'::\"char\" " +
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106 "AND NOT x.indisprimary ");
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107 }
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108
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109 @Override
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110 protected Index newDbBackupObject(Connection con, ResultSet rs, Schema schema) throws SQLException {
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111 Table table = tableFactory.getTable(rs.getInt("table_oid"));
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112 return new Index(rs.getString("indexname"), schema, table.getName(), rs.getString("indexdef"));
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113 }
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114
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115 }
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116
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117 protected final String tableName;
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118 private final String definition;
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119
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120 private Index(String name, Schema schema, String tableName, String definition) {
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121 super(name, schema, null); // no owner (always same as table)
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122 this.tableName = tableName;
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123 this.definition = definition;
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124 }
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125
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126 @Override
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127 String getSql(DataFilter dataFilter) {
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128 return definition.replace(" ON " + schema.getName() + ".", " ON ") + " ;\n"; // remove schema name
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129 }
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130
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131 @Override
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132 protected StringBuilder appendCreateSql(StringBuilder buf) {
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133 throw new UnsupportedOperationException();
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134 }
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135
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136 /* not used because too slow getting them
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137 private final static class PrimaryKey extends Index {
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138
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139 private SortedMap<Integer,String> columns = new TreeMap<Integer,String>();
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140
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141 private PrimaryKey(String name, Schema schema, String tableName) {
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142 super(name, schema, tableName, null);
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143 }
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144
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145 @Override
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146 public String getSql() {
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147 StringBuilder buf = new StringBuilder();
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148 buf.append("ALTER TABLE ");
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149 buf.append(tableName);
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150 buf.append(" ADD CONSTRAINT ");
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151 buf.append(name);
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152 buf.append(" PRIMARY KEY (");
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153 for (String column : columns.values()) {
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154 buf.append(column);
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155 buf.append(",");
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156 }
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157 buf.deleteCharAt(buf.length()-1);
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158 buf.append(");\n");
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159 return buf.toString();
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160 }
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161
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162 }
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163 */
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164
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165 }