How to Map MySQL\'s \'bit\' Type to Go: Bool or Custom Type?

Mapping MySQL's 'bit' Type to Go: Understanding Go Type Selection

In MySQL, the 'bit' data type represents a single bit value, often used to indicate a boolean state. When using Go with MySQL through an ORM like Beego, it's essential to choose the appropriate Go type for mapping this 'bit' type.

Java vs. Go Data Type Considerations

As mentioned, Java utilizes a 'bit(1)' type for such scenarios. However, in Go, there isn't a native 'bit' type. Therefore, we need to determine which Go type can adequately represent the 'bit' values.

Bool or Custom Type?

Initially, it might seem logical to use the Go 'bool' type, corresponding to the boolean nature of the 'bit' data. However, using 'bool' may lead to conversion errors when interacting with the database.

Custom BitBool Implementation

To address this issue, the Go library 'Sqlx' provides a custom 'BitBool' type specifically designed for mapping MySQL's 'bit' data. This type implements the driver.Valuer and sql.Scanner interfaces, effectively converting boolean values to and from 'bit(1)' bitfields.

Beego ORM Implementation

Within your Beego ORM struct, you can now use the 'BitBool' type for the 'Deleted' field, as shown below:

type BaseModel struct {
    Id          string           `orm:"pk";form:"id"`
    CreatedTime time.Time        `orm:"auto_now_add;type(datetime)";form:"-"`
    UpdatedTime time.Time        `orm:"auto_now;type(datetime)";form:"-"`
    Deleted     BitBool `form:"-"`
}

By utilizing the custom 'BitBool' type, you can effectively map the 'bit(1)' data to the Go 'BitBool' type within your Beego project without the need to alter the database schema.

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