Mercurial Hosting > luan
annotate src/luan/modules/sql/Database.java @ 1333:25746915a241
merge Luan and LuanState
| author | Franklin Schmidt <fschmidt@gmail.com> |
|---|---|
| date | Tue, 12 Feb 2019 22:33:40 -0700 |
| parents | 725e52076f03 |
| children | 8b61c8c4e07a |
| rev | line source |
|---|---|
| 1267 | 1 package luan.modules.sql; |
| 2 | |
| 3 import java.sql.Connection; | |
| 4 import java.sql.DriverManager; | |
| 5 import java.sql.Statement; | |
| 6 import java.sql.PreparedStatement; | |
| 7 import java.sql.ResultSet; | |
| 8 import java.sql.SQLException; | |
| 9 import java.util.Map; | |
| 10 import java.util.HashMap; | |
| 11 import java.util.Properties; | |
| 12 import org.slf4j.Logger; | |
| 13 import org.slf4j.LoggerFactory; | |
| 14 import luan.LuanTable; | |
| 15 import luan.LuanException; | |
| 16 | |
| 17 | |
|
1268
725e52076f03
remove broken pooling
Franklin Schmidt <fschmidt@gmail.com>
parents:
1267
diff
changeset
|
18 public final class Database { |
| 1267 | 19 private static final Logger logger = LoggerFactory.getLogger(Database.class); |
| 20 | |
| 21 public final Connection con; | |
| 22 private final Map<String,PreparedStatement> pstmts = new HashMap<String,PreparedStatement>(); | |
| 23 | |
| 24 public Database(Connection con) { | |
| 25 this.con = con; | |
| 26 } | |
| 27 | |
|
1268
725e52076f03
remove broken pooling
Franklin Schmidt <fschmidt@gmail.com>
parents:
1267
diff
changeset
|
28 public Database(LuanTable specTbl) |
| 1267 | 29 throws LuanException, ClassNotFoundException, SQLException |
| 30 { | |
|
1268
725e52076f03
remove broken pooling
Franklin Schmidt <fschmidt@gmail.com>
parents:
1267
diff
changeset
|
31 Map<Object,Object> spec = specTbl.asMap(); |
| 1267 | 32 String cls = getString(spec,"class"); |
| 33 Class.forName(cls); | |
| 34 String url = getString(spec,"url"); | |
| 35 Properties props = new Properties(); | |
| 36 props.putAll(spec); | |
| 37 this.con = DriverManager.getConnection(url,props); | |
| 38 } | |
| 39 | |
| 40 private static String getString(Map spec,String key) throws LuanException { | |
| 41 Object val = spec.remove(key); | |
| 42 if( val==null ) | |
| 43 throw new LuanException( "parameter '"+key+"' is required" ); | |
| 44 if( !(val instanceof String) ) | |
| 45 throw new LuanException( "parameter '"+key+"' must be a string" ); | |
| 46 return (String)val; | |
| 47 } | |
| 48 | |
| 49 private PreparedStatement prepareStatement(String sql,Object[] args) throws SQLException { | |
| 50 PreparedStatement pstmt = pstmts.get(sql); | |
| 51 if( pstmt==null ) { | |
| 52 pstmt = con.prepareStatement(sql); | |
| 53 pstmts.put(sql,pstmt); | |
| 54 } | |
| 55 for( int i=0; i<args.length; i++ ) { | |
| 56 pstmt.setObject(i+1,args[i]); | |
| 57 } | |
| 58 return pstmt; | |
| 59 } | |
| 60 | |
| 61 public ResultSet query(String sql,Object... args) throws SQLException { | |
| 62 if( args.length == 0 ) { | |
| 63 Statement stmt = con.createStatement(); | |
| 64 return stmt.executeQuery(sql); | |
| 65 } else { | |
| 66 PreparedStatement pstmt = prepareStatement(sql,args); | |
| 67 return pstmt.executeQuery(); | |
| 68 } | |
| 69 } | |
| 70 | |
| 71 public int update(String sql,Object... args) throws SQLException { | |
| 72 if( args.length == 0 ) { | |
| 73 Statement stmt = con.createStatement(); | |
| 74 int n = stmt.executeUpdate(sql); | |
| 75 stmt.close(); | |
| 76 return n; | |
| 77 } else { | |
| 78 PreparedStatement pstmt = prepareStatement(sql,args); | |
| 79 return pstmt.executeUpdate(); | |
| 80 } | |
| 81 } | |
| 82 | |
| 83 } |