TypeHandler

@MappedJdbcTypes({JdbcType.CLOB})
@MappedTypes({String.class})
public class TextHandler implements TypeHandler<String> {

    private int max = 300;

    @Override
    public void setParameter(PreparedStatement preparedStatement, int i, String s, JdbcType jdbcType) throws SQLException {
        preparedStatement.setString(i,s);
    }

    @Override
    public String getResult(ResultSet rs, String columnName) throws SQLException {
        String text = rs.getString(columnName);
        if (StringUtils.isNotEmpty(text)) {
            return text.substring(0, text.length() > max ? max : text.length());
        } else {
            return "";
        }
    }

    @Override
    public String getResult(ResultSet rs, int columnIndex) throws SQLException {
        String text = rs.getString(columnIndex);
        if (StringUtils.isNotEmpty(text)) {
            return text.substring(0, text.length() > max ? max : text.length());
        } else {
            return "";
        }
    }

    @Override
    public String getResult(CallableStatement cs, int columnIndex) throws SQLException {
        String text = cs.getString(columnIndex);
        if (StringUtils.isNotEmpty(text)) {
            return text.substring(0, text.length() > max ? max : text.length());
        } else {
            return "";
        }
    }
}

<result property="summary" column="summary" typeHandler="com.patsnap.inno.doc.core.handler.TextHandler" jdbcType="CLOB"/>