@Transactional(rollbackFor = Exception.class)
    @Override
    public boolean saveBatch(Collection<T> entityList, int batchSize) {
        String sqlStatement = sqlStatement(SqlMethod.INSERT_ONE);
        return executeBatch(entityList, batchSize, (sqlSession, entity) -> sqlSession.insert(sqlStatement, entity));
    }
    
    protected String sqlStatement(SqlMethod sqlMethod) {
        return SqlHelper.table(entityClass).getSqlStatement(sqlMethod.getMethod());
    }
    
    protected <E> boolean executeBatch(Collection<E> list, int batchSize, BiConsumer<SqlSession, E> consumer) {
        Assert.isFalse(batchSize < 1, "batchSize must not be less than one");
        return !CollectionUtils.isEmpty(list) && executeBatch(sqlSession -> {
            int size = list.size();
            int i = 1;
            for (E element : list) {
                consumer.accept(sqlSession, element);
                if ((i % batchSize == 0) || i == size) {
                    sqlSession.flushStatements();
                }
                i++;
            }
        });
    }

/**
 * 批量新增數(shù)據(jù),自選字段 insert
 * <p> 不同的數(shù)據(jù)庫支持度不一樣!!!  只在 mysql 下測試過!!!  只在 mysql 下測試過!!!  只在 mysql 下測試過!!! </p>
 * <p> 除了主鍵是 <strong> 數(shù)據(jù)庫自增的未測試 </strong> 外理論上都可以使用!!! </p>
 * <p> 如果你使用自增有報錯或主鍵值無法回寫到entity,就不要跑來問為什么了,因為我也不知道!!! </p>
 * <p>
 * 自己的通用 mapper 如下使用:
 * <pre>
 * int insertBatchSomeColumn(List<T> entityList);
 * </pre>
 * </p>
 *
 * <li> 注意: 這是自選字段 insert !!,如果個別字段在 entity 里為 null 但是數(shù)據(jù)庫中有配置默認值, insert 后數(shù)據(jù)庫字段是為 null 而不是默認值 </li>
 *
 * <p>
 * 常用的 {@link Predicate}:
 * </p>
 *
 * <li> 例1: t -> !t.isLogicDelete() , 表示不要邏輯刪除字段 </li>
 * <li> 例2: t -> !t.getProperty().equals("version") , 表示不要字段名為 version 的字段 </li>
 * <li> 例3: t -> t.getFieldFill() != FieldFill.UPDATE) , 表示不要填充策略為 UPDATE 的字段 </li>
 *
 * @author miemie
 * @since 2018-11-29
 */
@NoArgsConstructor
@AllArgsConstructor
public class InsertBatchSomeColumn extends AbstractMethod {

    /**
     * 字段篩選條件
     */
    @Setter
    @Accessors(chain = true)
    private Predicate<TableFieldInfo> predicate;

    @SuppressWarnings("Duplicates")
    @Override
    public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
        KeyGenerator keyGenerator = new NoKeyGenerator();
        SqlMethod sqlMethod = SqlMethod.INSERT_ONE;
        List<TableFieldInfo> fieldList = tableInfo.getFieldList();
        String insertSqlColumn = tableInfo.getKeyInsertSqlColumn(false) +
            this.filterTableFieldInfo(fieldList, predicate, TableFieldInfo::getInsertSqlColumn, EMPTY);
        String columnScript = LEFT_BRACKET + insertSqlColumn.substring(0, insertSqlColumn.length() - 1) + RIGHT_BRACKET;
        String insertSqlProperty = tableInfo.getKeyInsertSqlProperty(ENTITY_DOT, false) +
            this.filterTableFieldInfo(fieldList, predicate, i -> i.getInsertSqlProperty(ENTITY_DOT), EMPTY);
        insertSqlProperty = LEFT_BRACKET + insertSqlProperty.substring(0, insertSqlProperty.length() - 1) + RIGHT_BRACKET;
        String valuesScript = SqlScriptUtils.convertForeach(insertSqlProperty, "list", null, ENTITY, COMMA);
        String keyProperty = null;
        String keyColumn = null;
        // 表包含主鍵處理邏輯,如果不包含主鍵當(dāng)普通字段處理
        if (StringUtils.isNotBlank(tableInfo.getKeyProperty())) {
            if (tableInfo.getIdType() == IdType.AUTO) {
                /* 自增主鍵 */
                keyGenerator = new Jdbc3KeyGenerator();
                keyProperty = tableInfo.getKeyProperty();
                keyColumn = tableInfo.getKeyColumn();
            } else {
                if (null != tableInfo.getKeySequence()) {
                    keyGenerator = TableInfoHelper.genKeyGenerator(getMethod(sqlMethod), tableInfo, builderAssistant);
                    keyProperty = tableInfo.getKeyProperty();
                    keyColumn = tableInfo.getKeyColumn();
                }
            }
        }
        String sql = String.format(sqlMethod.getSql(), tableInfo.getTableName(), columnScript, valuesScript);
        SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, modelClass);
        return this.addInsertMappedStatement(mapperClass, modelClass, getMethod(sqlMethod), sqlSource, keyGenerator, keyProperty, keyColumn);
    }

    @Override
    public String getMethod(SqlMethod sqlMethod) {
        // 自定義 mapper 方法名
        return "insertBatchSomeColumn";
    }
}

    @Override
    public int insertBatch(List<Node> entityList) {
        if (CollectionUtils.isEmpty(entityList)) {
            return 0;
        }
        return getBaseMapper().insertBatchSomeColumn(entityList);
    }

com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'xxx_name' cannot be null

Inserting NULL into a column that has been declared NOT NULL. For multiple-row INSERT statements or 
INSERT INTO ... SELECT statements, the column is set to the implicit default value for the column
data type. This is 0 for numeric types, the empty string ('') for string types, and the “zero” value
for date and time types. INSERT INTO ... SELECT statements are handled the same way as multiple-row
inserts because the server does not examine the result set from the SELECT to see whether it returns
a single row. (For a single-row INSERT, no warning occurs when NULL is inserted into a NOT NULL column.
Instead, the statement fails with an error.)

    @Override
    public int insertBatch(List<Node> entityList) {
        if (CollectionUtils.isEmpty(entityList)) {
            return 0;
        }
        if (1 == entityList.size()) {
            return getBaseMapper().insert(entityList.get(0));
        }
        return getBaseMapper().insertBatchSomeColumn(entityList);
    }