Build converts the expression into a SQL fragment. Implements [dbx.Expression] interface.
(db *dbx.DB, params dbx.Params)
| 30 | // |
| 31 | // Implements [dbx.Expression] interface. |
| 32 | func (m *MultiMatchSubquery) Build(db *dbx.DB, params dbx.Params) string { |
| 33 | if m.TargetTableAlias == "" || m.FromTableName == "" || m.FromTableAlias == "" { |
| 34 | return "0=1" |
| 35 | } |
| 36 | |
| 37 | if params == nil { |
| 38 | params = m.Params |
| 39 | } else { |
| 40 | // merge by updating the parent params |
| 41 | for k, v := range m.Params { |
| 42 | params[k] = v |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | var mergedJoins strings.Builder |
| 47 | for i, j := range m.Joins { |
| 48 | if i > 0 { |
| 49 | mergedJoins.WriteString(" ") |
| 50 | } |
| 51 | mergedJoins.WriteString("LEFT JOIN ") |
| 52 | mergedJoins.WriteString(db.QuoteTableName(j.TableName)) |
| 53 | mergedJoins.WriteString(" ") |
| 54 | mergedJoins.WriteString(db.QuoteTableName(j.TableAlias)) |
| 55 | if j.On != nil { |
| 56 | mergedJoins.WriteString(" ON ") |
| 57 | mergedJoins.WriteString(j.On.Build(db, params)) |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | return fmt.Sprintf( |
| 62 | `SELECT %s as [[multiMatchValue]] FROM %s %s %s WHERE %s = %s`, |
| 63 | db.QuoteColumnName(m.ValueIdentifier), |
| 64 | db.QuoteTableName(m.FromTableName), |
| 65 | db.QuoteTableName(m.FromTableAlias), |
| 66 | mergedJoins.String(), |
| 67 | db.QuoteColumnName(m.FromTableAlias+".id"), |
| 68 | db.QuoteColumnName(m.TargetTableAlias+".id"), |
| 69 | ) |
| 70 | } |