返回总条数和分页数据
public PreviewData preview(String tableName, Integer pageNo, Integer pageSize) {
List<String> strings = qeuryTables();
if (!strings.contains(tableName)) {
throw new DdlException(ErrorCodeEnum.NOT_EXIST_TABLE);
}
Connection connection = null;
try {
connection = jdbcTemplate.getDataSource().getConnection();
DatabaseMetaData metaData = connection.getMetaData();
ResultSet rs = metaData.getColumns(null, null, tableName, null);
List<PreviewData.Field> fields = Lists.newArrayList();
while (rs.next()) {
fields.add(PreviewData.Field.builder().name(rs.getString("COLUMN_NAME")).type(rs.getString("TYPE_NAME")).build());
}
PreviewData build = PreviewData.builder().fields(fields).build();
String originalSql = "select * from " + warpName(tableName);
String countSql = "select count(1) as count from (%s) ";
String format = String.format(countSql, originalSql);
List<Map<String, Object>> maps1 = jdbcTemplate.queryForList(format);
if (!org.springframework.util.CollectionUtils.isEmpty(maps1)) {
BigInteger count = (BigInteger) (maps1.get(0).get("count"));
if (count == null) {
build.setTotal(0L);
} else {
build.setTotal(count.longValue());
}
}
originalSql = originalSql + " limit " + pageNo + "," + pageSize;
List<Map<String, Object>> maps = jdbcTemplate.queryForList(originalSql);
build.setRecords(maps);
build.setPageno(pageNo);
build.setPagesize(pageSize);
return build;
} catch (SQLException e) {
log.info("", e);
} finally {
JdbcUtils.closeConnection(connection);
}
return PreviewData.builder().build();
}
更多推荐
【Java开发bug-002】返回总条数和分页数据
发布评论