6.19. Using databases
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## 6.19. Using databases

表格 6.40. Variables for ports using databases

Variable | Means
--- | ---
`USE_BDB` | If variable is set to `yes`, add dependency on `databases/db41` port. The variable may also be set to values: 2, 3, 40, 41, 42, 43, 44, 45 46, or 47. You can declare a range of acceptable values, `USE_BDB`=42+ will find the highest installed version, and fall back to 42 if nothing else is installed.
`USE_MYSQL` | If variable is set to `yes`, add dependency on `databases/mysql50-server` port. An associated variable, `WANT_MYSQL_VER`, may be set to values such as 323, 40, 41, 50, 51 or 60.
`USE_PGSQL` | If set to `yes`, add dependency on `databases/postgresql82` port. An associated variable, `WANT_PGSQL_VER`, may be set to values such as 73, 74, 80, 81, 82, or 83.

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