Spark SQL and MySQL- SaveMode.Overwrite not inserting modified data

Question

I have a test table in MySQL with id and name like below:

+----+-------+
| id | name  |
+----+-------+
| 1  | Name1 |
+----+-------+
| 2  | Name         


        

Answer 1

Reading and writing to same table.

cols_df = df_2.columns

broad_cast_var = spark_context.broadcast(df_2.collect())

df_3 = sqlContext.createDataFrame(broad_cast_var.value, cols_df)

Reading and writing to same table with some modification.

cols_df = df_2.columns

broad_cast_var = spark_context.broadcast(df_2.collect())


def update_x(x):
    y = (x[0] + 311, *x[1:])
    return y


rdd_2_1 = spark_context.parallelize(broad_cast_var.value).map(update_x)

df_3 = sqlContext.createDataFrame(rdd_2_1, cols_df)