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());
}
int javaType = buffer.getJavaType();
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())));
javaType = Types.SMALLINT; // 往上加一个量级
break;
case 2: /* MYSQL_TYPE_SHORT */
columnBuilder.setValue(String.valueOf(Integer.valueOf(SMALLINT_MAX_VALUE
+ number.intValue())));
javaType = Types.INTEGER; // 往上加一个量级
break;
case 3: /* MYSQL_TYPE_INT24 */
columnBuilder.setValue(String.valueOf(Integer.valueOf(MEDIUMINT_MAX_VALUE
+ number.intValue())));
javaType = Types.INTEGER; // 往上加一个量级
break;
case 4: /* MYSQL_TYPE_LONG */
columnBuilder.setValue(String.valueOf(Long.valueOf(INTEGER_MAX_VALUE
+ number.longValue())));
javaType = Types.BIGINT; // 往上加一个量级
break;
case 8: /* MYSQL_TYPE_LONGLONG */
columnBuilder.setValue(BIGINT_MAX_VALUE.add(BigInteger.valueOf(number.longValue())).toString());
javaType = Types.DECIMAL; // 往上加一个量级，避免执行出错
break;
}
} 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 (fieldMeta != null && isText(fieldMeta.getColumnType())) {
columnBuilder.setValue(new String((byte[]) value, charset));
javaType = Types.CLOB;
} 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));