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1267
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1 package luan.modules.sql;
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2
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3 import java.io.Closeable;
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4 import java.sql.Connection;
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5 import java.sql.DriverManager;
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6 import java.sql.Statement;
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7 import java.sql.PreparedStatement;
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8 import java.sql.ResultSet;
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9 import java.sql.SQLException;
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10 import java.util.Map;
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11 import java.util.HashMap;
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12 import java.util.Properties;
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13 import org.slf4j.Logger;
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14 import org.slf4j.LoggerFactory;
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15 import luan.LuanState;
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16 import luan.LuanTable;
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17 import luan.LuanException;
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18
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19
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20 public final class Database implements Closeable {
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21 private static final Logger logger = LoggerFactory.getLogger(Database.class);
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22
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23 private static Map<Map,Database> pool = new HashMap<Map,Database>();
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24
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25 public static Database get(Connection con) {
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26 return new Database(con);
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27 }
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28
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29 public static synchronized Database get(LuanTable specTbl)
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30 throws LuanException, ClassNotFoundException, SQLException
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31 {
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32 Map<Object,Object> spec = specTbl.asMap();
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33 Database db = pool.get(spec);
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34 if( db==null ) {
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35 db = new Database(spec);
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36 pool.put(spec,db);
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37 }
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38 return db;
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39 }
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40
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41 public int uses = 0;
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42 public final Connection con;
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43 private final Map<String,PreparedStatement> pstmts = new HashMap<String,PreparedStatement>();
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44
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45 public Database(Connection con) {
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46 this.con = con;
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47 }
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48
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49 private Database(Map<Object,Object> spec)
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50 throws LuanException, ClassNotFoundException, SQLException
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51 {
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52 spec = new HashMap<Object,Object>(spec);
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53 String cls = getString(spec,"class");
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54 Class.forName(cls);
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55 String url = getString(spec,"url");
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56 Properties props = new Properties();
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57 props.putAll(spec);
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58 this.con = DriverManager.getConnection(url,props);
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59 }
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60
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61 private static String getString(Map spec,String key) throws LuanException {
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62 Object val = spec.remove(key);
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63 if( val==null )
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64 throw new LuanException( "parameter '"+key+"' is required" );
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65 if( !(val instanceof String) )
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66 throw new LuanException( "parameter '"+key+"' must be a string" );
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67 return (String)val;
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68 }
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69
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70 private PreparedStatement prepareStatement(String sql,Object[] args) throws SQLException {
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71 PreparedStatement pstmt = pstmts.get(sql);
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72 if( pstmt==null ) {
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73 pstmt = con.prepareStatement(sql);
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74 pstmts.put(sql,pstmt);
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75 }
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76 for( int i=0; i<args.length; i++ ) {
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77 pstmt.setObject(i+1,args[i]);
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78 }
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79 return pstmt;
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80 }
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81
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82 public ResultSet query(String sql,Object... args) throws SQLException {
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83 if( args.length == 0 ) {
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84 Statement stmt = con.createStatement();
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85 return stmt.executeQuery(sql);
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86 } else {
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87 PreparedStatement pstmt = prepareStatement(sql,args);
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88 return pstmt.executeQuery();
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89 }
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90 }
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91
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92 public int update(String sql,Object... args) throws SQLException {
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93 if( args.length == 0 ) {
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94 Statement stmt = con.createStatement();
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95 int n = stmt.executeUpdate(sql);
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96 stmt.close();
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97 return n;
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98 } else {
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99 PreparedStatement pstmt = prepareStatement(sql,args);
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100 return pstmt.executeUpdate();
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101 }
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102 }
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103
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104 public void close() {
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105 try {
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106 con.close();
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107 } catch(SQLException e) {
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108 throw new RuntimeException(e);
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109 }
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110 }
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111
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112 protected void finalize() throws Throwable {
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113 if( !con.isClosed() ) {
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114 logger.error("not closed");
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115 close();
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116 }
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117 super.finalize();
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118 }
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119
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120 }
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