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Implements #412 - allows passing an existing *sql.DB connection to MySQL, Postgres, and SQLite backends instead of requiring connection parameters. Changes: - Add NewMysqlBackendWithDB, NewPostgresBackendWithDB, NewSqliteBackendWithDB - Add ownsConnection field to prevent closing user-provided connections - MySQL: Add WithMigrationDSN option for migrations with external connections - Postgres/SQLite: Migrations work directly with passed connection When using *WithDB constructors: - Migrations are disabled by default - Close() will not close the database connection - MySQL requires WithMigrationDSN if ApplyMigrations is enabled
Tests cover: - Using provided connection (ownsConnection=false) - Close() not closing user-provided connections - Migrations disabled by default - Migrations can be enabled - MySQL: migration fails without MigrationDSN
Documents the new constructors for using existing database connections with SQLite, MySQL, and PostgreSQL backends, including: - Usage examples - Migration handling differences - MySQL-specific WithMigrationDSN option
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Fixes #412
Allows passing an existing
*sql.DBconnection to MySQL, Postgres, and SQLite backends instead of requiring connection parameters.Changes
NewMysqlBackendWithDB,NewPostgresBackendWithDB,NewSqliteBackendWithDBownsConnectionfield to prevent closing user-provided connectionsWithMigrationDSNoption for migrations with external connectionsBehavior when using
*WithDBconstructorsClose()will not close the database connectionWithMigrationDSNifApplyMigrationsis enabled (due to multi-statement requirement)