Add minimum versions of databases to the docs

[zeripath]

We do not currently state the minimum versions of databases we support.

This PR sets them to:

• MySQL >=5.7
• Postgres >=10
• MSSQL >=2008R2 SP3

Reference #17067

Signed-off-by: Andrew Thornton [email protected]

[zeripath]

Now whilst checking the postgres db version is kinda easy the rest are not so, so I'm not proposing adding the additional code to check the minimum version. Although the below would do it for postgres

func checkDBVersion(e *xorm.Engine) {
	switch {
	case setting.Database.UsePostgreSQL:
		var versionString string
		if _, err := e.SQL("SELECT current_setting('server_version_num')").Get(&versionString); err != nil {
			log.Critical("Unable to check version of Postgres. This version of Postges may be unsupported. Error: %v", err)
			return
		}
		version, err := strconv.Atoi(versionString)
		if err != nil {
			log.Critical("Unexpected DB version: %s which is not an integer. This version of Postgres may be unsupported.", versionString)
			return
		}
		if version < 100000 {
			log.Critical("This version (%s) of Postgres is unsupported. Upgrade your database.", versionString)
			return
		}
	}
}

[lunny]

Now whilst checking the postgres db version is kinda easy the rest are not so, so I'm not proposing adding the additional code to check the minimum version. Although the below would do it for postgres

func checkDBVersion(e *xorm.Engine) {
	switch {
	case setting.Database.UsePostgreSQL:
		var versionString string
		if _, err := e.SQL("SELECT current_setting('server_version_num')").Get(&versionString); err != nil {
			log.Critical("Unable to check version of Postgres. This version of Postges may be unsupported. Error: %v", err)
			return
		}
		version, err := strconv.Atoi(versionString)
		if err != nil {
			log.Critical("Unexpected DB version: %s which is not an integer. This version of Postgres may be unsupported.", versionString)
			return
		}
		if version < 100000 {
			log.Critical("This version (%s) of Postgres is unsupported. Upgrade your database.", versionString)
			return
		}
	}
}

xorm v1.2.3 has supports to get DB version.

[zeripath]

xorm v1.2.3 has supports to get DB version.

ah but MariaDB and MySQL both do interesting things with their version numbers