private boolean isUpdate(List<Column> bfColumns, String newValue, int index) {
if (bfColumns == null) {
throw new CanalParseException("ERROR ## the bfColumns is null");
}
if (index < 0) {
return false;
}
if ((bfColumns.size() - 1) < index) {
return false;
}
Column column = bfColumns.get(index);
if (column.getIsNull()) {
if (newValue != null) {
return true;
}
} else {
if (newValue == null) {
return true;
} else {
if (!column.getValue().equals(newValue)) {
return true;
}
}
}
return false;
}
private void parseOneRow(
RowData.Builder rowDataBuilder,
RowsLogEvent event,
RowsLogBuffer buffer,
BitSet cols,
boolean isAfter,
TableMeta tableMeta)
throws UnsupportedEncodingException {
final int columnCnt = event.getTable().getColumnCnt();
final ColumnInfo[] columnInfo = event.getTable().getColumnInfo();
// check table fileds count，只能处理加字段
if (tableMeta != null && columnInfo.length > tableMeta.getFileds().size()) {
throw new CanalParseException(
"column size is not match for table:" + tableMeta.getFullName());
}
for (int i = 0; i < columnCnt; i++) {
ColumnInfo info = columnInfo[i];
buffer.nextValue(info.type, info.meta);
FieldMeta fieldMeta = null;
Column.Builder columnBuilder = Column.newBuilder();
columnBuilder.setIndex(i);
columnBuilder.setIsNull(false);
if (tableMeta != null) {
// 处理file meta
fieldMeta = tableMeta.getFileds().get(i);
columnBuilder.setName(fieldMeta.getColumnName());
columnBuilder.setIsKey(fieldMeta.isKey());
}
final int javaType = buffer.getJavaType();
columnBuilder.setSqlType(javaType);
if (buffer.isNull()) {
columnBuilder.setIsNull(true);
} else {
final Serializable value = buffer.getValue();
// 处理各种类型
switch (javaType) {
case Types.INTEGER:
case Types.TINYINT:
case Types.SMALLINT:
case Types.BIGINT:
// 处理unsigned类型
Number number = (Number) value;
if (fieldMeta != null && fieldMeta.isUnsigned() && number.longValue() < 0) {
switch (buffer.getLength()) {
case 1: /* MYSQL_TYPE_TINY */
columnBuilder.setValue(
String.valueOf(Integer.valueOf(TINYINT_MAX_VALUE + number.intValue())));
case 2: /* MYSQL_TYPE_SHORT */
columnBuilder.setValue(
String.valueOf(Integer.valueOf(SMALLINT_MAX_VALUE + number.intValue())));
case 3: /* MYSQL_TYPE_INT24 */
columnBuilder.setValue(
String.valueOf(Integer.valueOf(MEDIUMINT_MAX_VALUE + number.intValue())));
case 4: /* MYSQL_TYPE_LONG */
columnBuilder.setValue(
String.valueOf(Long.valueOf(INTEGER_MAX_VALUE + number.longValue())));
case 8: /* MYSQL_TYPE_LONGLONG */
columnBuilder.setValue(
BIGINT_MAX_VALUE.add(BigInteger.valueOf(number.longValue())).toString());
}
} else {
// 对象为number类型，直接valueof即可
columnBuilder.setValue(String.valueOf(value));
}
break;
case Types.REAL: // float
case Types.DOUBLE: // double
case Types.BIT: // bit
// 对象为number类型，直接valueof即可
columnBuilder.setValue(String.valueOf(value));
break;
case Types.DECIMAL:
columnBuilder.setValue(((BigDecimal) value).toPlainString());
break;
case Types.TIMESTAMP:
String v = value.toString();
v = v.substring(0, v.length() - 2);
columnBuilder.setValue(v);
break;
case Types.TIME:
case Types.DATE:
// 需要处理year
columnBuilder.setValue(value.toString());
break;
case Types.BINARY:
case Types.VARBINARY:
case Types.LONGVARBINARY:
// fixed text encoding https://github.com/AlibabaTech/canal/issues/18
// mysql binlog中blob/text都处理为blob类型，需要反查table meta，按编码解析text
if (isText(fieldMeta.getColumnType())) {
columnBuilder.setValue(new String((byte[]) value, charset));
} else {
// byte数组，直接使用iso-8859-1保留对应编码，浪费内存
columnBuilder.setValue(new String((byte[]) value, ISO_8859_1));
}
break;
case Types.CHAR:
case Types.VARCHAR:
// 本身对象为string
columnBuilder.setValue(value.toString());
break;
default:
columnBuilder.setValue(value.toString());
}
}
// 设置是否update的标记位
columnBuilder.setUpdated(
isAfter
&& isUpdate(
rowDataBuilder.getBeforeColumnsList(),
columnBuilder.getIsNull() ? null : columnBuilder.getValue(),
i));
if (isAfter) {
rowDataBuilder.addAfterColumns(columnBuilder.build());
} else {
rowDataBuilder.addBeforeColumns(columnBuilder.build());
}
}
}