Mercurial Hosting > luan
annotate src/luan/modules/lucene/PostgresBackup.java @ 1399:38a1c1b4279a
fix
| author | Franklin Schmidt <fschmidt@gmail.com> |
|---|---|
| date | Wed, 11 Sep 2019 16:28:38 -0600 |
| parents | 67c0e47b5be3 |
| children | 27efb1fcbcb5 |
| 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; |
| 20 import luan.lib.logging.Logger; | |
| 21 import luan.lib.logging.LoggerFactory; | |
| 22 | |
| 23 | |
| 24 final class PostgresBackup { | |
| 1393 | 25 private static final Logger sysLogger = LoggerFactory.getLogger(PostgresBackup.class); |
| 26 | |
| 27 private final Logger luanLogger; | |
| 1387 | 28 |
| 29 final boolean wasCreated; | |
| 1391 | 30 private final String url; |
| 31 private final Properties props = new Properties(); | |
| 1387 | 32 private final Connection con; |
| 33 private final PreparedStatement insertStmt; | |
| 34 private final PreparedStatement updateStmt; | |
| 35 private final PreparedStatement deleteStmt; | |
| 36 private int trans = 0; | |
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37 private final LuanToString luanToString = new LuanToString(); |
| 1387 | 38 |
| 1393 | 39 PostgresBackup(Luan luan,Map spec) |
| 1392 | 40 throws ClassNotFoundException, SQLException, LuanException |
| 1387 | 41 { |
| 1393 | 42 this.luanLogger = luan.getLogger(PostgresBackup.class); |
| 1392 | 43 /* |
| 1387 | 44 Class.forName("org.postgresql.Driver"); |
| 1391 | 45 url = "jdbc:postgresql://localhost:5432/luan"; |
| 1387 | 46 props.setProperty("user","postgres"); |
| 47 props.setProperty("password",""); | |
| 1392 | 48 */ |
| 49 String cls = "org.postgresql.Driver"; | |
| 50 if( !Utils.removeRequiredString(spec,"class").equals(cls) ) | |
| 51 throw new LuanException( "parameter 'class' must be '"+cls+"'" ); | |
| 52 Class.forName(cls); | |
| 53 url = Utils.removeRequiredString(spec,"url"); | |
| 54 props.setProperty( "user", Utils.removeRequiredString(spec,"user") ); | |
| 55 props.setProperty( "password", Utils.removeRequiredString(spec,"password") ); | |
| 56 Utils.checkEmpty(spec); | |
| 1387 | 57 |
| 1391 | 58 con = newConnection(); |
| 1387 | 59 |
| 60 Statement stmt = con.createStatement(); | |
| 61 boolean hasTable = stmt.executeQuery( | |
| 62 "select * from information_schema.tables where table_name='lucene'" | |
| 63 ).next(); | |
| 64 if( !hasTable ) { | |
| 65 stmt.executeUpdate( | |
| 66 "create table lucene (" | |
| 67 +" id integer not null primary key," | |
| 68 +" data text not null" | |
| 69 +")" | |
| 70 ); | |
| 71 } | |
| 72 stmt.close(); | |
| 73 wasCreated = !hasTable; | |
| 74 | |
| 75 insertStmt = con.prepareStatement( | |
| 76 "insert into lucene (id,data) values (?,?)" | |
| 77 ); | |
| 78 updateStmt = con.prepareStatement( | |
| 79 "update lucene set data=? where id=?" | |
| 80 ); | |
| 81 deleteStmt = con.prepareStatement( | |
| 82 "delete from lucene where id=?" | |
| 83 ); | |
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parents:
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84 |
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85 luanToString.strict = true; |
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parents:
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diff
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86 luanToString.numberTypes = true; |
| 1391 | 87 } |
| 88 | |
| 89 Connection newConnection() throws SQLException { | |
| 90 return DriverManager.getConnection(url,props); | |
| 1387 | 91 } |
| 92 | |
| 1392 | 93 void close() throws SQLException { |
| 94 insertStmt.close(); | |
| 95 updateStmt.close(); | |
| 96 deleteStmt.close(); | |
| 97 con.close(); | |
| 1387 | 98 } |
| 99 | |
| 100 protected void finalize() throws Throwable { | |
| 1398 | 101 close(); |
| 1387 | 102 super.finalize(); |
| 103 } | |
| 104 | |
| 1392 | 105 void add(LuanTable doc) throws LuanException, SQLException { |
| 106 Long id = (Long)doc.get("id"); | |
| 107 String data = luanToString.toString(doc); | |
| 108 insertStmt.setLong(1,id); | |
| 109 insertStmt.setString(2,data); | |
| 110 insertStmt.executeUpdate(); | |
| 1387 | 111 } |
| 112 | |
| 1392 | 113 void update(LuanTable doc) throws LuanException, SQLException { |
| 114 Long id = (Long)doc.get("id"); | |
| 115 String data = luanToString.toString(doc); | |
| 116 updateStmt.setString(1,data); | |
| 117 updateStmt.setLong(2,id); | |
| 118 int n = updateStmt.executeUpdate(); | |
| 119 if( n==0 ) { | |
| 1393 | 120 luanLogger.error("update not found for id="+id+", trying add"); |
| 1392 | 121 add(doc); |
| 122 } else if( n!=1 ) | |
| 123 throw new RuntimeException(); | |
| 1387 | 124 } |
| 125 | |
| 1392 | 126 void deleteAll() throws SQLException { |
| 127 Statement stmt = con.createStatement(); | |
| 128 stmt.executeUpdate("delete from lucene"); | |
| 129 stmt.close(); | |
| 1387 | 130 } |
| 131 | |
| 1392 | 132 void delete(long id) throws SQLException, LuanException { |
| 133 deleteStmt.setLong(1,id); | |
| 134 int n = deleteStmt.executeUpdate(); | |
| 135 if( n==0 ) | |
| 136 throw new LuanException("delete not found for id="+id); | |
| 1387 | 137 } |
| 138 | |
| 1392 | 139 void begin() throws SQLException { |
| 140 if( trans++ == 0 ) | |
| 141 con.setAutoCommit(false); | |
| 1387 | 142 } |
| 143 | |
| 1392 | 144 void commit() throws SQLException, LuanException { |
| 145 if( trans <= 0 ) | |
| 146 throw new LuanException("commit not in transaction"); | |
| 147 if( --trans == 0 ) | |
| 1387 | 148 con.setAutoCommit(true); |
| 1392 | 149 } |
| 150 | |
| 151 void rollback() throws SQLException, LuanException { | |
| 152 if( --trans != 0 ) | |
| 153 throw new LuanException("rollback failed trans="+trans); | |
| 154 con.rollback(); | |
| 155 con.setAutoCommit(true); | |
| 1387 | 156 } |
| 157 | |
| 1391 | 158 private static LuanTable newEnv() { |
| 159 LuanTable env = new LuanTable(new Luan()); | |
| 160 LuanToString.addNumberTypes(env); | |
| 161 return env; | |
| 162 } | |
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parents:
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diff
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163 |
| 1391 | 164 private static Object eval(String s,LuanTable env) throws LuanException { |
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parents:
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diff
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165 LuanFunction fn = env.luan().load( "return "+s, "PostgresBackup", env ); |
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parents:
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166 return fn.call(); |
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parents:
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diff
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167 } |
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parents:
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diff
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168 |
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parents:
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diff
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169 void restoreLucene(LuceneIndex li) |
| 1392 | 170 throws LuanException, IOException, SQLException |
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parents:
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diff
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171 { |
| 1392 | 172 LuanTable env = newEnv(); |
| 173 Statement stmt = con.createStatement(); | |
| 174 ResultSet rs = stmt.executeQuery("select data from lucene"); | |
| 175 while( rs.next() ) { | |
| 176 String data = rs.getString("data"); | |
| 177 LuanTable doc = (LuanTable)eval(data,env); | |
| 178 li.restore(doc); | |
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parents:
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diff
changeset
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179 } |
| 1392 | 180 stmt.close(); |
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parents:
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diff
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181 } |
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parents:
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diff
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182 |
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parents:
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183 long maxId() |
| 1392 | 184 throws LuanException, IOException, SQLException |
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parents:
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diff
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185 { |
| 1392 | 186 Statement stmt = con.createStatement(); |
| 187 ResultSet rs = stmt.executeQuery("select max(id) as m from lucene"); | |
| 188 rs.next(); | |
| 189 long m = rs.getLong("m"); | |
| 190 stmt.close(); | |
| 191 return m; | |
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parents:
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192 } |
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parents:
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diff
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193 |
| 1391 | 194 final class Checker { |
| 195 private final Connection con; | |
| 196 private final PreparedStatement pstmt; | |
| 197 private final LuanTable env = newEnv(); | |
| 198 | |
| 199 Checker() throws SQLException { | |
| 200 con = newConnection(); | |
| 201 con.setAutoCommit(false); | |
| 202 pstmt = con.prepareStatement( | |
| 203 "select data from lucene where id=?" | |
| 204 ); | |
| 205 } | |
| 206 | |
| 207 void close() throws SQLException { | |
| 208 pstmt.close(); | |
| 209 con.close(); | |
| 210 } | |
| 211 | |
| 212 List<Long> getIds() throws SQLException { | |
| 213 List<Long> ids = new ArrayList<Long>(); | |
| 214 Statement stmt = con.createStatement(); | |
| 215 ResultSet rs = stmt.executeQuery("select id from lucene order by id"); | |
| 216 while( rs.next() ) { | |
| 217 long id = rs.getLong("id"); | |
| 218 ids.add(id); | |
| 219 } | |
| 220 stmt.close(); | |
| 221 return ids; | |
| 222 } | |
| 223 | |
| 224 LuanTable getDoc(long id) throws SQLException, LuanException { | |
| 225 pstmt.setLong(1,id); | |
| 226 ResultSet rs = pstmt.executeQuery(); | |
| 1399 | 227 if( !rs.next() ) |
| 228 return null; | |
| 1391 | 229 String data = rs.getString("data"); |
| 230 LuanTable doc = (LuanTable)eval(data,env); | |
| 231 return doc; | |
| 232 } | |
| 233 } | |
| 234 | |
| 235 Checker newChecker() throws SQLException { | |
| 236 return new Checker(); | |
| 237 } | |
| 238 | |
| 1387 | 239 } |