在使用 BigQuery 插入数据时，如果出现数据没有插入的情况，可能有以下几个原因和解决方法：

1. 数据格式不正确：请确保插入的数据格式与目标表的模式匹配。可以通过检查目标表的模式和数据的格式是否一致来解决问题。

from google.cloud import bigquery

client = bigquery.Client()

table_id = "your-project.your_dataset.your_table"

job_config = bigquery.LoadJobConfig(
    schema=[
        bigquery.SchemaField("name", "STRING"),
        bigquery.SchemaField("age", "INTEGER"),
    ],
    skip_leading_rows=1,
    source_format=bigquery.SourceFormat.CSV,
)

uri = "gs://your-bucket/your-file.csv"

load_job = client.load_table_from_uri(
    uri, table_id, job_config=job_config
)  # Make an API request.

load_job.result()  # Waits for the job to complete.

table = client.get_table(table_id)  # Make an API request.
print("Loaded {} rows to table {}".format(table.num_rows, table_id))

2. 访问权限不正确：请确保插入数据的服务账号具有正确的权限。可以通过为服务账号分配 BigQuery 数据编辑权限来解决问题。

from google.cloud import bigquery

client = bigquery.Client()

table_id = "your-project.your_dataset.your_table"

job_config = bigquery.LoadJobConfig(
    schema=[
        bigquery.SchemaField("name", "STRING"),
        bigquery.SchemaField("age", "INTEGER"),
    ],
    skip_leading_rows=1,
    source_format=bigquery.SourceFormat.CSV,
)

uri = "gs://your-bucket/your-file.csv"

load_job = client.load_table_from_uri(
    uri, table_id, job_config=job_config
)  # Make an API request.

load_job.result()  # Waits for the job to complete.

table = client.get_table(table_id)  # Make an API request.
print("Loaded {} rows to table {}".format(table.num_rows, table_id))

3. 数据冲突：如果插入的数据与表中已有的数据存在冲突，可以考虑使用 WriteDisposition 参数来解决问题。例如，使用 WriteDisposition.WRITE_TRUNCATE 可以清空表中的数据再插入新数据。

from google.cloud import bigquery

client = bigquery.Client()

table_id = "your-project.your_dataset.your_table"

job_config = bigquery.LoadJobConfig(
    schema=[
        bigquery.SchemaField("name", "STRING"),
        bigquery.SchemaField("age", "INTEGER"),
    ],
    skip_leading_rows=1,
    source_format=bigquery.SourceFormat.CSV,
    write_disposition=bigquery.WriteDisposition.WRITE_TRUNCATE,
)

uri = "gs://your-bucket/your-file.csv"

load_job = client.load_table_from_uri(
    uri, table_id, job_config=job_config
)  # Make an API request.

load_job.result()  # Waits for the job to complete.

table = client.get_table(table_id)  # Make an API request.
print("Loaded {} rows to table {}".format(table.num_rows, table_id))

以上是一些可能导致 BigQuery 数据没有插入的常见问题和解决方法。根据具体情况，选择适当的解决方法来解决问题。