annotate src/jdbcpgbackup/Table.java @ 16:2e504670a010

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author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 03 Oct 2019 22:14:53 -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.io.IOException;
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6 import java.io.InputStream;
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7 import java.io.OutputStream;
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8 import java.sql.Connection;
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9 import java.sql.PreparedStatement;
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10 import java.sql.ResultSet;
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11 import java.sql.SQLException;
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12 import java.util.ArrayList;
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13 import java.util.Arrays;
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14 import java.util.Comparator;
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15 import java.util.HashMap;
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16 import java.util.HashSet;
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17 import java.util.List;
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18 import java.util.Map;
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19 import java.util.Set;
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20 import java.util.TreeSet;
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21
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22 import org.postgresql.PGConnection;
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23 import org.postgresql.copy.CopyManager;
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24 import org.postgresql.core.BaseConnection;
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25
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26 final class Table extends DbBackupObject {
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27
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28 static class TableFactory implements DBOFactory<Table> {
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29
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30 @Override
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31 public Iterable<Table> getDbBackupObjects(Connection con, Schema schema) throws SQLException {
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32 ZipBackup.timerStart("tables");
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33 List<Table> tables = new ArrayList<Table>();
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34 PreparedStatement stmt = null;
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35 try {
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36 stmt = con.prepareStatement("SELECT pg_get_userbyid(c.relowner) AS tableowner, " +
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37 "c.relname AS tablename, c.oid AS table_oid " +
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38 "FROM pg_class c " +
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39 "WHERE c.relkind = 'r'::\"char\" AND c.relnamespace = ?");
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40 stmt.setInt(1, schema.getOid());
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41 ResultSet rs = stmt.executeQuery();
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42 while (rs.next()) {
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43 Table table = new Table(rs.getString("tablename"), schema, rs.getString("tableowner"));
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44 loadColumns(con, table, rs.getInt("table_oid"));
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45 tables.add(table);
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46 }
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47 rs.close();
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48 } finally {
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49 if (stmt != null) stmt.close();
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50 }
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51 ZipBackup.timerEnd("tables");
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52 return tables;
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53 }
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54
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55 // does not load columns
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56 @Override
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57 public Table getDbBackupObject(Connection con, String tableName, Schema schema) throws SQLException {
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58 return getDbBackupObject(con, tableName, schema, false);
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59 }
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60
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61 public Table getDbBackupObject(Connection con, String tableName, Schema schema, boolean loadColumns) throws SQLException {
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62 Table table = null;
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63 PreparedStatement stmt = null;
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64 try {
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65 stmt = con.prepareStatement("SELECT pg_get_userbyid(c.relowner) AS tableowner, c.oid AS table_oid " +
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66 "FROM pg_class c " +
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67 "WHERE c.relkind = 'r'::\"char\" AND c.relnamespace = ? " +
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68 "AND c.relname = ?");
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69 stmt.setInt(1, schema.getOid());
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70 stmt.setString(2, tableName);
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71 ResultSet rs = stmt.executeQuery();
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72 if (rs.next()) {
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73 table = new Table(tableName, schema, rs.getString("tableowner"));
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74 if (loadColumns) loadColumns(con, table, rs.getInt("table_oid"));
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75 } else {
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76 throw new RuntimeException("no such table: " + tableName);
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77 }
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78 rs.close();
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79 } finally {
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80 if (stmt != null) stmt.close();
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81 }
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82 return table;
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83 }
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84
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85 private void loadColumns(Connection con, Table table, int tableOid) throws SQLException {
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86 PreparedStatement stmt = null;
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87 try {
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88 stmt = con.prepareStatement(
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89 "SELECT a.attname,a.atttypid," +
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90 "a.attnotnull OR (t.typtype = 'd' AND t.typnotnull) AS attnotnull,a.atttypmod," +
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91 "row_number() OVER (PARTITION BY a.attrelid ORDER BY a.attnum) AS attnum, " +
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92 "pg_catalog.pg_get_expr(def.adbin, def.adrelid) AS adsrc,t.typtype " +
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93 "FROM pg_catalog.pg_attribute a " +
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94 "JOIN pg_catalog.pg_type t ON (a.atttypid = t.oid) " +
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95 "LEFT JOIN pg_catalog.pg_attrdef def ON (a.attrelid=def.adrelid AND a.attnum = def.adnum) " +
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96 "WHERE a.attnum > 0 AND NOT a.attisdropped " +
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97 "AND a.attrelid = ? ");
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98 stmt.setInt(1, tableOid);
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99 ResultSet rs = stmt.executeQuery();
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100 while (rs.next()) {
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101 table.columns.add(table.new Column((BaseConnection)con, rs));
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102 }
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103 rs.close();
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104 } finally {
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105 if (stmt != null) stmt.close();
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106 }
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107 }
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108
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109 }
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110
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111 static class CachingTableFactory extends CachingDBOFactory<Table> {
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112
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113 private final Map<Integer,Table> oidMap;
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114
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115 protected CachingTableFactory(Schema.CachingSchemaFactory schemaFactory) {
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116 super(schemaFactory);
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117 oidMap = new HashMap<Integer,Table>();
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118 }
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119
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120 @Override
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121 protected PreparedStatement getAllStatement(Connection con) throws SQLException {
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122 return con.prepareStatement("SELECT c.relnamespace AS schema_oid, c.relname AS tablename, " +
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123 "pg_get_userbyid(c.relowner) AS tableowner, c.oid " +
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124 "FROM pg_class c " +
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125 "WHERE c.relkind = 'r'::\"char\"");
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126 }
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127
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128 @Override
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129 protected Table newDbBackupObject(Connection con, ResultSet rs, Schema schema) throws SQLException {
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130 Table table = new Table(rs.getString("tablename"), schema, rs.getString("tableowner"));
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131 oidMap.put(rs.getInt("oid"), table);
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132 return table;
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133 }
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134
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135 @Override
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136 protected void loadMap(Connection con) throws SQLException {
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137 ZipBackup.timerStart("tables");
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138 super.loadMap(con);
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139 ZipBackup.timerEnd("tables");
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140 loadColumns(con);
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141 }
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142
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143 Table getTable(int table_oid) {
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144 return oidMap.get(table_oid);
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145 }
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146
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147 private void loadColumns(Connection con) throws SQLException {
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148 ZipBackup.timerStart("load columns");
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149 ZipBackup.debug("begin loading columns...");
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150 PreparedStatement stmt = null;
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151 try {
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152 stmt = con.prepareStatement(
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153 "SELECT a.attrelid AS table_oid, a.attname, a.atttypid," +
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154 "a.attnotnull OR (t.typtype = 'd' AND t.typnotnull) AS attnotnull, a.atttypmod, " +
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155 "row_number() OVER (PARTITION BY a.attrelid ORDER BY a.attnum) AS attnum, " +
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156 "pg_catalog.pg_get_expr(def.adbin, def.adrelid) AS adsrc, t.typtype " +
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157 "FROM pg_catalog.pg_attribute a " +
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158 "JOIN pg_catalog.pg_type t ON (a.atttypid = t.oid) " +
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159 "LEFT JOIN pg_catalog.pg_attrdef def ON (a.attrelid=def.adrelid AND a.attnum = def.adnum) " +
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160 "WHERE a.attnum > 0 AND NOT a.attisdropped ");
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161 int count = 0;
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162 ResultSet rs = stmt.executeQuery();
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163 while (rs.next()) {
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164 int oid = rs.getInt("table_oid");
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165 Table table = oidMap.get(oid);
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166 if (table != null) {
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167 table.columns.add(table.new Column((BaseConnection)con, rs));
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168 if (++count%100000 == 1) ZipBackup.debug("loaded " + count + " columns");
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169 }
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170 }
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171 rs.close();
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172 } finally {
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173 if (stmt != null) stmt.close();
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174 }
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175 ZipBackup.debug("end loading columns");
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176 ZipBackup.timerEnd("load columns");
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177 }
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178
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179 }
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180
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181
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182 /*
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183 private static void loadSequences(Connection con, Schema schema, Map<String,Table> tables) throws SQLException {
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184 ZipBackup.timerStart("load sequences");
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185 PreparedStatement stmt = con.prepareStatement(
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186 "SELECT c.relname AS sequencename, d.refobjsubid AS columnid, p.relname AS tablename " +
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187 "FROM pg_class c, pg_depend d, pg_class p " +
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188 "WHERE d.refobjid = p.oid " +
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189 "AND p.relnamespace = (SELECT oid FROM pg_namespace WHERE nspname = ?) " +
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190 "AND c.oid = d.objid AND c.relkind = 'S'");
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191 stmt.setString(1, schema.getName());
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192 ResultSet rs = stmt.executeQuery();
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193 while (rs.next()) {
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194 tables.get(rs.getString("tablename")).columns.get(rs.getInt("columnid")).setSequenceName(rs.getString("sequencename"));
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195 }
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196 rs.close();
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197 stmt.close();
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198 ZipBackup.timerEnd("load sequences");
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199 }
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200 */
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201
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202 private final Set<Column> columns = new TreeSet<Column>(
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203 new Comparator<Column>() {
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204 public int compare(Column a, Column b) {
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205 return a.position - b.position;
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206 };
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207 });
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208
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209 private Table(String name, Schema schema, String owner) {
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210 super(name, schema, owner);
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211 }
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212
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213 @Override
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214 protected StringBuilder appendCreateSql(StringBuilder buf) {
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215 buf.append("CREATE TABLE ").append(getName());
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216 buf.append(" (");
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217 for (Column column : columns) {
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218 column.appendSql(buf);
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219 buf.append(",");
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220 }
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221 buf.deleteCharAt(buf.length()-1);
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222 buf.append(")");
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223 buf.append(" ;\n");
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224 for (Column column : columns) {
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225 column.appendSequenceSql(buf);
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226 }
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227 return buf;
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228 }
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229
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230 void dump(Connection con, OutputStream os) throws SQLException, IOException {
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231 CopyManager copyManager = ((PGConnection)con).getCopyAPI();
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232 copyManager.copyOut("COPY " + getFullname() + " TO STDOUT BINARY", os);
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233 }
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234
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235 void restore(InputStream is, Connection con) throws SQLException, IOException {
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236 CopyManager copyManager = ((PGConnection)con).getCopyAPI();
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237 copyManager.copyIn("COPY " + getFullname() + " FROM STDIN BINARY", is);
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238 }
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239
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240 private static final Set<String> appendSizeTo = new HashSet<String>(
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241 Arrays.asList("bit", "varbit", "bit varying", "bpchar", "char", "varchar", "character", "character varying"));
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242
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243 private static final Set<String> appendPrecisionTo = new HashSet<String>(
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244 Arrays.asList("time", "timestamp", "timetz", "timestamptz"));
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245
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246 /*
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247 private static final Map<String,String> aliasMap = new HashMap<String,String>();
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248 static {
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249 aliasMap.put("serial","integer");
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250 aliasMap.put("serial4","integer");
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251 aliasMap.put("serial8","bigint");
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252 aliasMap.put("bigserial","bigint");
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253 }
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254
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255 private static String getAlias(String type) {
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256 String alias = aliasMap.get(type);
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257 return alias != null ? alias : type;
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258 }
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259 */
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260
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261 private class Column {
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262
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263 private final String name;
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264 private final String typeName;
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265 private /*final*/ int columnSize;
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266 private final int decimalDigits;
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267 private final int nullable;
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268 private final String defaultValue;
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269 private final boolean isAutoincrement;
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270 private final String sequenceName;
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271 private final int position;
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272
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273 private Column(BaseConnection con, ResultSet rs) throws SQLException {
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274
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275 int typeOid = (int)rs.getLong("atttypid");
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276 int typeMod = rs.getInt("atttypmod");
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277
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278 position = rs.getInt("attnum");
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279 name = rs.getString("attname");
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280 typeName = con.getTypeInfo().getPGType(typeOid);
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281 decimalDigits = con.getTypeInfo().getScale(typeOid, typeMod);
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282 columnSize = con.getTypeInfo().getPrecision(typeOid, typeMod);
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283 if (columnSize == 0) {
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284 columnSize = con.getTypeInfo().getDisplaySize(typeOid, typeMod);
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285 }
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286 if (columnSize == Integer.MAX_VALUE) {
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287 columnSize = 0;
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288 }
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289 nullable = rs.getBoolean("attnotnull") ? java.sql.DatabaseMetaData.columnNoNulls : java.sql.DatabaseMetaData.columnNullable;
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290 String columnDef = rs.getString("adsrc");
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291 if (columnDef != null) {
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292 defaultValue = columnDef.replace("nextval('" + schema.getName() + ".", "nextval('"); // remove schema name
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293 isAutoincrement = columnDef.indexOf("nextval(") != -1;
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294 } else {
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295 defaultValue = null;
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296 isAutoincrement = false;
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297 }
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298 if (isAutoincrement) {
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299 PreparedStatement stmt = null;
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300 try {
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301 stmt = con.prepareStatement(
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302 "SELECT pg_get_serial_sequence( ? , ? ) AS sequencename");
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303 stmt.setString(1, getFullname());
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304 stmt.setString(2, name);
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305 ResultSet rs2 = stmt.executeQuery();
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306 if (rs2.next() && rs2.getString("sequencename") != null) {
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307 sequenceName = rs2.getString("sequencename").replace(schema.getName() + ".", "");
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308 } else {
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309 sequenceName = null;
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310 }
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311 rs2.close();
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312 } finally {
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313 if (stmt != null) stmt.close();
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314 }
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315 } else sequenceName = null;
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316 }
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317
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318 private StringBuilder appendSql(StringBuilder buf) {
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319 buf.append(name).append(" ");
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320 buf.append(typeName);
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321 if (appendSizeTo.contains(typeName) && columnSize > 0) {
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322 buf.append( "(").append(columnSize).append(")");
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323 } else if (appendPrecisionTo.contains(typeName) || typeName.startsWith("interval")) {
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324 buf.append("(").append(decimalDigits).append(")");
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325 } else if ("numeric".equals(typeName) || "decimal".equals(typeName)) {
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326 buf.append("(").append(columnSize).append(",").append(decimalDigits).append(")");
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327 }
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328 if (defaultValue != null) {
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329 buf.append(" DEFAULT ").append(defaultValue);
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330 }
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331 if (nullable == java.sql.DatabaseMetaData.columnNoNulls) {
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332 buf.append(" NOT NULL");
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333 }
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334 return buf;
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335 }
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336
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337 private StringBuilder appendSequenceSql(StringBuilder buf) {
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338 if (sequenceName == null) return buf;
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339 buf.append("ALTER SEQUENCE ");
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340 buf.append(sequenceName);
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341 buf.append(" OWNED BY ");
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342 buf.append(getName());
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Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
343 buf.append(".").append(name);
7ecd1a4ef557 add content
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
344 buf.append(" ;\n");
7ecd1a4ef557 add content
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
345 return buf;
7ecd1a4ef557 add content
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
346 }
7ecd1a4ef557 add content
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
347
7ecd1a4ef557 add content
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
348 }
7ecd1a4ef557 add content
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
349
7ecd1a4ef557 add content
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
350 }