覆盖 getModelGeneratedKey 与 getRecordGeneratedKey，解决 PostgreSql 获取自增主键时

rs.getObject(1) 总是返回第一个字段的值，而非返回了 id 值，仅需 rs.getXxx(1) 改成
rs.getXxx(pKey)

src/main/java/com/jfinal/plugin/activerecord/dialect/PostgreSqlDialect.java

@@ -17,11 +17,13 @@
 package com.jfinal.plugin.activerecord.dialect;
 
 import java.sql.PreparedStatement;
+import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Set;
+import com.jfinal.plugin.activerecord.Model;
 import com.jfinal.plugin.activerecord.Record;
 import com.jfinal.plugin.activerecord.Table;
 
@@ -206,4 +208,48 @@ public class PostgreSqlDialect extends Dialect {
 	public void fillStatement(PreparedStatement pst, Object... paras) throws SQLException {
 		fillStatementHandleDateType(pst, paras);
 	}
+	
+	/**
+	 * 解决 PostgreSql 获取自增主键时 rs.getObject(1) 总是返回第一个字段的值，而非返回了 id 值
+	 * issue: https://www.oschina.net/question/2312705_2243354
+	 * 
+	 * 将 rs.getXxx(1) 改成了 rs.getXxx(pKey)
+	 */
+	public void getModelGeneratedKey(Model<?> model, PreparedStatement pst, Table table) throws SQLException {
+		String[] pKeys = table.getPrimaryKey();
+		ResultSet rs = pst.getGeneratedKeys();
+		for (String pKey : pKeys) {
+			if (model.get(pKey) == null || isOracle()) {
+				if (rs.next()) {
+					Class<?> colType = table.getColumnType(pKey);
+					if (colType == Integer.class || colType == int.class) {
+						model.set(pKey, rs.getInt(pKey));
+					} else if (colType == Long.class || colType == long.class) {
+						model.set(pKey, rs.getLong(pKey));
+					} else {
+						model.set(pKey, rs.getObject(pKey));
+					}
+				}
+			}
+		}
+		rs.close();
+	}
+	
+	/**
+	 * 解决 PostgreSql 获取自增主键时 rs.getObject(1) 总是返回第一个字段的值，而非返回了 id 值
+	 * issue: https://www.oschina.net/question/2312705_2243354
+	 * 
+	 * 将 rs.getXxx(1) 改成了 rs.getXxx(pKey)
+	 */
+	public void getRecordGeneratedKey(PreparedStatement pst, Record record, String[] pKeys) throws SQLException {
+		ResultSet rs = pst.getGeneratedKeys();
+		for (String pKey : pKeys) {
+			if (record.get(pKey) == null || isOracle()) {
+				if (rs.next()) {
+					record.set(pKey, rs.getObject(pKey));
+				}
+			}
+		}
+		rs.close();
+	}
 }