sql refactoring

db/src/main/java/org/zhdev/sql/AbstractSqlConnection.java

@@ -1,36 +0,0 @@
-package org.zhdev.sql;
-
-import java.sql.Connection;
-import java.sql.PreparedStatement;
-import java.sql.SQLException;
-
-abstract class AbstractSqlConnection implements SqlConnection {
-    private final Connection connection;
-
-    AbstractSqlConnection(Connection connection) {
-        this.connection = connection;
-    }
-
-    @Override
-    public PreparedStatement prepareStatement(String query) throws SQLException {
-        return connection.prepareStatement(query);
-    }
-
-    @Override
-    public boolean isClosed() {
-        try {
-            return connection.isClosed();
-        } catch (SQLException e) {
-            throw new SqlException(e);
-        }
-    }
-
-    @Override
-    public void close() {
-        try {
-            connection.close();
-        } catch (SQLException e) {
-            throw new SqlException(e);
-        }
-    }
-}