JDBC-Generate Insert-Sql statement based on the return value of ResultSet

Needed when the data is under the online data wire, export the sql statement of insert

Parse the metadata in the resultset, get the column name and corresponding column value of the result set, and splice them into SQL

@Override
    public MetaData mapRow(ResultSet rs, int rowNum) throws SQLException {
        MetaData data = new MetaData();
        StringBuilder sb = new StringBuilder();
        ResultSetMetaData metaData = rs.getMetaData();
        String tableName = metaData.getTableName(1);
        sb.append("INSERT INTO ").append(tableName);
        Map<String,String> pair = getColumnsPair(rs);
        StringBuffer firstSb = new StringBuffer();
        StringBuffer lastSb = new StringBuffer();
        for(Map.Entry<String,String> entry : pair.entrySet()){
            firstSb.append(entry.getKey()).append(",");
            lastSb.append(entry.getValue()).append(",");
        }
        firstSb.deleteCharAt(firstSb.length() - 1);
        lastSb.deleteCharAt(lastSb.length() - 1);
        sb.append(" ( ").append(firstSb).append(" ) VALUES ( ").append(lastSb).append(" );\n");

        data.setID(rs.getInt("ID"));
        data.setSql(sb.toString());
        return data;
    }


    private Map<String,String> getColumnsPair(ResultSet rs) throws SQLException {
        Map<String,String> result = Maps.newHashMap();
        ResultSetMetaData metaData = rs.getMetaData();
        int columnCount = metaData.getColumnCount();
        for(int i=1;i<=columnCount;i++){
            result.put(metaData.getColumnName(i),
                    getColumnValue(metaData.getColumnName(i),metaData.getColumnType(i),i,rs));
        }
       
        return result;
    }
    
    private String getColumnValue(String columnName,int columnType,int i,ResultSet rs) throws SQLException {
        switch(columnType){
            case Types.NUMERIC :return rs.getLong(i) + "";
            case Types.VARCHAR:
                return (rs.getString(i) == null) ? null : "'"+rs.getString(i)+"'";
            case Types.DATE:
                return (rs.getDate(i) == null) ? null:"'"+DateUtil.dateToString(rs.getDate(i), "yyyy-MM-dd")+"'";
            case Types.TIMESTAMP:
                return (rs.getTimestamp(i) == null) ? null:"'"+DateUtil.dateToString(rs.getTimestamp(i),"yyyy-MM-dd HH:mm:ss")+"'";
            //case Types.TIME:return rs.getTime(i);
            case Types.BOOLEAN:return rs.getInt(i) + "";
            //case Types.ARRAY :return rs.getArray(i);
            case Types.BIGINT :return rs.getLong(i) + "";
            //case Types.BINARY:return rs.getBinaryStream(i);
            //case Types.BLOB:return rs.getBlob(i);
            case Types.CHAR:
                return (rs.getString(i) == null) ? null : "'"+rs.getString(i)+"'";
            case Types.INTEGER:return rs.getInt(i) + "";
            case Types.DOUBLE :return rs.getDouble(i) + "";
            case Types.FLOAT:return rs.getFloat(i) + "";
            case Types.SMALLINT:return rs.getInt(i) + "";
            case Types.TINYINT:return rs.getInt(i) + "";
            case Types.DECIMAL:return rs.getLong(i) + "";
            default:return null;
        }
    }