mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-28 14:42:46 +00:00
136 lines
3.3 KiB
Go
136 lines
3.3 KiB
Go
package sqlitedialect
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import (
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"database/sql"
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"encoding/hex"
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"fmt"
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"github.com/uptrace/bun"
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"github.com/uptrace/bun/dialect"
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"github.com/uptrace/bun/dialect/feature"
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"github.com/uptrace/bun/dialect/sqltype"
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"github.com/uptrace/bun/schema"
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)
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func init() {
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if Version() != bun.Version() {
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panic(fmt.Errorf("sqlitedialect and Bun must have the same version: v%s != v%s",
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Version(), bun.Version()))
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}
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}
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type Dialect struct {
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schema.BaseDialect
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tables *schema.Tables
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features feature.Feature
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}
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func New() *Dialect {
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d := new(Dialect)
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d.tables = schema.NewTables(d)
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d.features = feature.CTE |
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feature.WithValues |
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feature.Returning |
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feature.InsertReturning |
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feature.InsertTableAlias |
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feature.UpdateTableAlias |
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feature.DeleteTableAlias |
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feature.InsertOnConflict |
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feature.TableNotExists |
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feature.SelectExists |
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feature.AutoIncrement |
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feature.CompositeIn |
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feature.DeleteReturning
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return d
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}
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func (d *Dialect) Init(*sql.DB) {}
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func (d *Dialect) Name() dialect.Name {
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return dialect.SQLite
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}
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func (d *Dialect) Features() feature.Feature {
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return d.features
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}
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func (d *Dialect) Tables() *schema.Tables {
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return d.tables
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}
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func (d *Dialect) OnTable(table *schema.Table) {
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for _, field := range table.FieldMap {
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d.onField(field)
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}
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}
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func (d *Dialect) onField(field *schema.Field) {
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field.DiscoveredSQLType = fieldSQLType(field)
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}
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func (d *Dialect) IdentQuote() byte {
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return '"'
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}
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func (d *Dialect) AppendBytes(b []byte, bs []byte) []byte {
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if bs == nil {
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return dialect.AppendNull(b)
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}
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b = append(b, `X'`...)
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s := len(b)
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b = append(b, make([]byte, hex.EncodedLen(len(bs)))...)
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hex.Encode(b[s:], bs)
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b = append(b, '\'')
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return b
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}
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func (d *Dialect) DefaultVarcharLen() int {
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return 0
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}
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// AppendSequence adds AUTOINCREMENT keyword to the column definition. As per [documentation],
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// AUTOINCREMENT is only valid for INTEGER PRIMARY KEY, and this method will be a noop for other columns.
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//
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// Because this is a valid construct:
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//
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// CREATE TABLE ("id" INTEGER PRIMARY KEY AUTOINCREMENT);
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//
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// and this is not:
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//
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// CREATE TABLE ("id" INTEGER AUTOINCREMENT, PRIMARY KEY ("id"));
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//
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// AppendSequence adds a primary key constraint as a *side-effect*. Callers should expect it to avoid building invalid SQL.
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// SQLite also [does not support] AUTOINCREMENT column in composite primary keys.
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//
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// [documentation]: https://www.sqlite.org/autoinc.html
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// [does not support]: https://stackoverflow.com/a/6793274/14726116
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func (d *Dialect) AppendSequence(b []byte, table *schema.Table, field *schema.Field) []byte {
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if field.IsPK && len(table.PKs) == 1 && field.CreateTableSQLType == sqltype.Integer {
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b = append(b, " PRIMARY KEY AUTOINCREMENT"...)
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}
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return b
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}
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// DefaultSchemaName is the "schema-name" of the main database.
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// The details might differ from other dialects, but for all means and purposes
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// "main" is the default schema in an SQLite database.
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func (d *Dialect) DefaultSchema() string {
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return "main"
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}
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func fieldSQLType(field *schema.Field) string {
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switch field.DiscoveredSQLType {
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case sqltype.SmallInt, sqltype.BigInt:
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// INTEGER PRIMARY KEY is an alias for the ROWID.
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// It is safe to convert all ints to INTEGER, because SQLite types don't have size.
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return sqltype.Integer
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default:
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return field.DiscoveredSQLType
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}
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}
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