Mercurial Hosting > luan
annotate src/luan/modules/lucene/PostgresBackup.java @ 1392:002152af497a
hosted postgres
| author | Franklin Schmidt <fschmidt@gmail.com> |
|---|---|
| date | Fri, 06 Sep 2019 00:19:47 -0600 |
| parents | 94f48cc76de8 |
| children | cc0dbca576dc |
| rev | line source |
|---|---|
| 1387 | 1 package luan.modules.lucene; |
| 2 | |
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3 import java.io.IOException; |
| 1387 | 4 import java.sql.Connection; |
| 5 import java.sql.DriverManager; | |
| 6 import java.sql.Statement; | |
| 7 import java.sql.PreparedStatement; | |
| 8 import java.sql.SQLException; | |
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9 import java.sql.ResultSet; |
| 1387 | 10 import java.util.Properties; |
| 1391 | 11 import java.util.List; |
| 12 import java.util.ArrayList; | |
| 1392 | 13 import java.util.Map; |
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14 import luan.Luan; |
| 1387 | 15 import luan.LuanTable; |
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16 import luan.LuanFunction; |
| 1387 | 17 import luan.LuanException; |
| 1392 | 18 import luan.modules.Utils; |
| 1387 | 19 import luan.modules.parsers.LuanToString; |
| 1392 | 20 import luan.modules.logging.LuanLogger; |
| 1387 | 21 import luan.lib.logging.Logger; |
| 22 import luan.lib.logging.LoggerFactory; | |
| 23 | |
| 24 | |
| 25 final class PostgresBackup { | |
| 26 private static final Logger logger = LoggerFactory.getLogger(PostgresBackup.class); | |
| 27 | |
| 28 final boolean wasCreated; | |
| 1391 | 29 private final String url; |
| 30 private final Properties props = new Properties(); | |
| 1387 | 31 private final Connection con; |
| 32 private final PreparedStatement insertStmt; | |
| 33 private final PreparedStatement updateStmt; | |
| 34 private final PreparedStatement deleteStmt; | |
| 35 private int trans = 0; | |
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36 private final LuanToString luanToString = new LuanToString(); |
| 1387 | 37 |
| 1392 | 38 PostgresBackup(Map spec) |
| 39 throws ClassNotFoundException, SQLException, LuanException | |
| 1387 | 40 { |
| 1392 | 41 /* |
| 1387 | 42 Class.forName("org.postgresql.Driver"); |
| 1391 | 43 url = "jdbc:postgresql://localhost:5432/luan"; |
| 1387 | 44 props.setProperty("user","postgres"); |
| 45 props.setProperty("password",""); | |
| 1392 | 46 */ |
| 47 String cls = "org.postgresql.Driver"; | |
| 48 if( !Utils.removeRequiredString(spec,"class").equals(cls) ) | |
| 49 throw new LuanException( "parameter 'class' must be '"+cls+"'" ); | |
| 50 Class.forName(cls); | |
| 51 url = Utils.removeRequiredString(spec,"url"); | |
| 52 props.setProperty( "user", Utils.removeRequiredString(spec,"user") ); | |
| 53 props.setProperty( "password", Utils.removeRequiredString(spec,"password") ); | |
| 54 Utils.checkEmpty(spec); | |
| 1387 | 55 |
| 1391 | 56 con = newConnection(); |
| 1387 | 57 |
| 58 Statement stmt = con.createStatement(); | |
| 59 boolean hasTable = stmt.executeQuery( | |
| 60 "select * from information_schema.tables where table_name='lucene'" | |
| 61 ).next(); | |
| 62 if( !hasTable ) { | |
| 63 stmt.executeUpdate( | |
| 64 "create table lucene (" | |
| 65 +" id integer not null primary key," | |
| 66 +" data text not null" | |
| 67 +")" | |
| 68 ); | |
| 69 } | |
| 70 stmt.close(); | |
| 71 wasCreated = !hasTable; | |
| 72 | |
| 73 insertStmt = con.prepareStatement( | |
| 74 "insert into lucene (id,data) values (?,?)" | |
| 75 ); | |
| 76 updateStmt = con.prepareStatement( | |
| 77 "update lucene set data=? where id=?" | |
| 78 ); | |
| 79 deleteStmt = con.prepareStatement( | |
| 80 "delete from lucene where id=?" | |
| 81 ); | |
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parents:
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82 |
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83 luanToString.strict = true; |
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84 luanToString.numberTypes = true; |
| 1391 | 85 } |
| 86 | |
| 87 Connection newConnection() throws SQLException { | |
| 88 return DriverManager.getConnection(url,props); | |
| 1387 | 89 } |
| 90 | |
| 1392 | 91 void close() throws SQLException { |
| 92 insertStmt.close(); | |
| 93 updateStmt.close(); | |
| 94 deleteStmt.close(); | |
| 95 con.close(); | |
| 1387 | 96 } |
| 97 | |
| 98 protected void finalize() throws Throwable { | |
| 99 super.finalize(); | |
| 100 if( !con.isClosed() ) { | |
| 101 logger.error("con not closed"); | |
| 102 con.close(); | |
| 103 } | |
| 104 } | |
| 105 | |
| 1392 | 106 void add(LuanTable doc) throws LuanException, SQLException { |
| 107 Long id = (Long)doc.get("id"); | |
| 108 String data = luanToString.toString(doc); | |
| 109 insertStmt.setLong(1,id); | |
| 110 insertStmt.setString(2,data); | |
| 111 insertStmt.executeUpdate(); | |
| 1387 | 112 } |
| 113 | |
| 1392 | 114 void update(LuanTable doc) throws LuanException, SQLException { |
| 115 Long id = (Long)doc.get("id"); | |
| 116 String data = luanToString.toString(doc); | |
| 117 updateStmt.setString(1,data); | |
| 118 updateStmt.setLong(2,id); | |
| 119 int n = updateStmt.executeUpdate(); | |
| 120 if( n==0 ) { | |
| 121 Logger logger = LuanLogger.getLogger(doc.luan(),PostgresBackup.class); | |
| 122 logger.error("update not found for id="+id+", trying add"); | |
| 123 add(doc); | |
| 124 } else if( n!=1 ) | |
| 125 throw new RuntimeException(); | |
| 1387 | 126 } |
| 127 | |
| 1392 | 128 void deleteAll() throws SQLException { |
| 129 Statement stmt = con.createStatement(); | |
| 130 stmt.executeUpdate("delete from lucene"); | |
| 131 stmt.close(); | |
| 1387 | 132 } |
| 133 | |
| 1392 | 134 void delete(long id) throws SQLException, LuanException { |
| 135 deleteStmt.setLong(1,id); | |
| 136 int n = deleteStmt.executeUpdate(); | |
| 137 if( n==0 ) | |
| 138 throw new LuanException("delete not found for id="+id); | |
| 1387 | 139 } |
| 140 | |
| 1392 | 141 void begin() throws SQLException { |
| 142 if( trans++ == 0 ) | |
| 143 con.setAutoCommit(false); | |
| 1387 | 144 } |
| 145 | |
| 1392 | 146 void commit() throws SQLException, LuanException { |
| 147 if( trans <= 0 ) | |
| 148 throw new LuanException("commit not in transaction"); | |
| 149 if( --trans == 0 ) | |
| 1387 | 150 con.setAutoCommit(true); |
| 1392 | 151 } |
| 152 | |
| 153 void rollback() throws SQLException, LuanException { | |
| 154 if( --trans != 0 ) | |
| 155 throw new LuanException("rollback failed trans="+trans); | |
| 156 con.rollback(); | |
| 157 con.setAutoCommit(true); | |
| 1387 | 158 } |
| 159 | |
| 1391 | 160 private static LuanTable newEnv() { |
| 161 LuanTable env = new LuanTable(new Luan()); | |
| 162 LuanToString.addNumberTypes(env); | |
| 163 return env; | |
| 164 } | |
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parents:
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165 |
| 1391 | 166 private static Object eval(String s,LuanTable env) throws LuanException { |
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parents:
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167 LuanFunction fn = env.luan().load( "return "+s, "PostgresBackup", env ); |
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parents:
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168 return fn.call(); |
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parents:
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diff
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169 } |
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Franklin Schmidt <fschmidt@gmail.com>
parents:
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diff
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170 |
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parents:
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diff
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171 void restoreLucene(LuceneIndex li) |
| 1392 | 172 throws LuanException, IOException, SQLException |
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parents:
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diff
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173 { |
| 1392 | 174 LuanTable env = newEnv(); |
| 175 Statement stmt = con.createStatement(); | |
| 176 ResultSet rs = stmt.executeQuery("select data from lucene"); | |
| 177 while( rs.next() ) { | |
| 178 String data = rs.getString("data"); | |
| 179 LuanTable doc = (LuanTable)eval(data,env); | |
| 180 li.restore(doc); | |
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parents:
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diff
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181 } |
| 1392 | 182 stmt.close(); |
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parents:
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diff
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183 } |
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parents:
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diff
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184 |
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parents:
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185 long maxId() |
| 1392 | 186 throws LuanException, IOException, SQLException |
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parents:
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187 { |
| 1392 | 188 Statement stmt = con.createStatement(); |
| 189 ResultSet rs = stmt.executeQuery("select max(id) as m from lucene"); | |
| 190 rs.next(); | |
| 191 long m = rs.getLong("m"); | |
| 192 stmt.close(); | |
| 193 return m; | |
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parents:
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194 } |
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parents:
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diff
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195 |
| 1391 | 196 final class Checker { |
| 197 private final Connection con; | |
| 198 private final PreparedStatement pstmt; | |
| 199 private final LuanTable env = newEnv(); | |
| 200 | |
| 201 Checker() throws SQLException { | |
| 202 con = newConnection(); | |
| 203 con.setAutoCommit(false); | |
| 204 pstmt = con.prepareStatement( | |
| 205 "select data from lucene where id=?" | |
| 206 ); | |
| 207 } | |
| 208 | |
| 209 void close() throws SQLException { | |
| 210 pstmt.close(); | |
| 211 con.close(); | |
| 212 } | |
| 213 | |
| 214 List<Long> getIds() throws SQLException { | |
| 215 List<Long> ids = new ArrayList<Long>(); | |
| 216 Statement stmt = con.createStatement(); | |
| 217 ResultSet rs = stmt.executeQuery("select id from lucene order by id"); | |
| 218 while( rs.next() ) { | |
| 219 long id = rs.getLong("id"); | |
| 220 ids.add(id); | |
| 221 } | |
| 222 stmt.close(); | |
| 223 return ids; | |
| 224 } | |
| 225 | |
| 226 LuanTable getDoc(long id) throws SQLException, LuanException { | |
| 227 pstmt.setLong(1,id); | |
| 228 ResultSet rs = pstmt.executeQuery(); | |
| 229 rs.next(); | |
| 230 String data = rs.getString("data"); | |
| 231 LuanTable doc = (LuanTable)eval(data,env); | |
| 232 return doc; | |
| 233 } | |
| 234 } | |
| 235 | |
| 236 Checker newChecker() throws SQLException { | |
| 237 return new Checker(); | |
| 238 } | |
| 239 | |
| 1387 | 240 } |