https://dev.mysql.com/doc/refman/5.7/en/storage-requirements.html

+----------------------------+----------------------------------------------------+--------------------------------+

| Data Type                  | Storage Required                                   | Java Type                      |

+----------------------------+----------------------------------------------------+--------------------------------+

| TINYINT                    | 1 byte                                             | Byte                           |

| SMALLINT                   | 2 bytes                                            | Short                          |

| MEDIUMINT                  | 3 bytes                                            | Integer                        |

| INT, INTEGER               | 4 bytes                                            | Integer                        |

| BIGINT                     | 8 bytes                                            | Long                           |

| FLOAT(0-24)                | 4 bytes if 0 <= p <= 24                            | Float                          |

| FLOAT(25-53)               | 8 bytes if 25 <= p <= 53                           | Double                         |

| FLOAT                      | 4 bytes                                            | Float                          |

| DOUBLE(0-8)                | 8 bytes                                            | Double                         |

| REAL                       | 8 bytes                                            | Double                         |

| DECIMAL(m,n)               |  Maximum is 65 for 'm',Maximum is 30 for 'n'.      |                                |

| DECIMAL(1-4,0)             |                                                    | Short                          |

| DECIMAL(5-9,0)             |                                                    | Integer                        |

| DECIMAL(0,0)               |  Same as decimal                                   | Long                           |

| DECIMAL(10-18,0)           |                                                    | Long                           |

| DECIMAL(19-65,0)           |                                                    | BigDecimal                     |

| DECIMAL(m,1+)              |                                                    | BigDecimal                     |

| NUMERIC(m,n)               | Same as DECIMAL(m,n)                               |                                |

| BIT(n)                     | approximately (M+7)/8 bytes                        | Boolean                        |

+----------------------------+----------------------------------------------------+--------------------------------+

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