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63 lines
2.2 KiB
Go
63 lines
2.2 KiB
Go
package migrate
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import (
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"database/sql"
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)
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// Operation interface covers basic migration operations.
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// Implementation details is specific for each database,
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// see migrate/sqlite.go for implementation reference.
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type Operation interface {
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// CreateTable may be used to create a table named `tableName`
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// with its columns specification listed in `args` as an array of string
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CreateTable(tableName string, args []string) (sql.Result, error)
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// RenameTable simply rename table from `tableName` to `newName`
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RenameTable(tableName, newName string) (sql.Result, error)
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// DropTable drops table named `tableName`
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DropTable(tableName string) (sql.Result, error)
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// AddColumn adds single new column to `tableName`, columnSpec is
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// a standard column definition (column name included) which may looks like this:
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//
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// mg.AddColumn("example", "email VARCHAR(255) UNIQUE")
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//
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// it's equivalent to:
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//
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// mg.AddColumn("example", mg.T.String("email", UNIQUE))
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//
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AddColumn(tableName, columnSpec string) (sql.Result, error)
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// ChangeColumn may be used to change the type of a column
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// `newType` should always specify the column's new type even
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// if the type is not meant to be change. Eg.
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//
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// mg.ChangeColumn("example", "name", "VARCHAR(255) UNIQUE")
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//
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ChangeColumn(tableName, columnName, newType string) (sql.Result, error)
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// DropColumns drops a list of columns
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DropColumns(tableName string, columnsToDrop ...string) (sql.Result, error)
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// RenameColumns will rename columns listed in `columnChanges`
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RenameColumns(tableName string, columnChanges map[string]string) (sql.Result, error)
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// AddIndex adds index on `tableName` indexed by `columns`
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AddIndex(tableName string, columns []string, flags ...string) (sql.Result, error)
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// DropIndex drops index indexed by `columns` from `tableName`
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DropIndex(tableName string, columns []string) (sql.Result, error)
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}
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// MigrationDriver drives migration script by injecting transaction object (*sql.Tx),
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// `Operation` implementation and column type helper.
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type MigrationDriver struct {
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Operation
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T *columnType
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Tx *sql.Tx
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}
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// DriverBuilder is a constructor for MigrationDriver
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type DriverBuilder func(tx *sql.Tx) *MigrationDriver
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