|
| 1 | +package sqlite |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "database/sql" |
| 6 | + "database/sql/driver" |
| 7 | + "errors" |
| 8 | + "fmt" |
| 9 | + "io" |
| 10 | + |
| 11 | + spindb "github.com/spinframework/spin-go-sdk/v3/internal/db" |
| 12 | + "github.com/spinframework/spin-go-sdk/v3/internal/fermyon/spin/v2.0.0/sqlite" |
| 13 | + "go.bytecodealliance.org/cm" |
| 14 | +) |
| 15 | + |
| 16 | +// Open returns a new connection to the database. |
| 17 | +func Open(name string) *sql.DB { |
| 18 | + return sql.OpenDB(&connector{name: name}) |
| 19 | +} |
| 20 | + |
| 21 | +// conn represents a database connection. |
| 22 | +type conn struct { |
| 23 | + spinConn sqlite.Connection |
| 24 | +} |
| 25 | + |
| 26 | +// Close the connection. |
| 27 | +func (c *conn) Close() error { |
| 28 | + return nil |
| 29 | +} |
| 30 | + |
| 31 | +// Prepare returns a prepared statement, bound to this connection. |
| 32 | +func (c *conn) Prepare(query string) (driver.Stmt, error) { |
| 33 | + return &stmt{conn: c, query: query}, nil |
| 34 | +} |
| 35 | + |
| 36 | +// Begin isn't supported. |
| 37 | +func (c *conn) Begin() (driver.Tx, error) { |
| 38 | + return nil, errors.New("transactions are unsupported by this driver") |
| 39 | +} |
| 40 | + |
| 41 | +// connector implements driver.Connector. |
| 42 | +type connector struct { |
| 43 | + conn *conn |
| 44 | + name string |
| 45 | +} |
| 46 | + |
| 47 | +// Connect returns a connection to the database. |
| 48 | +func (d *connector) Connect(_ context.Context) (driver.Conn, error) { |
| 49 | + if d.conn != nil { |
| 50 | + return d.conn, nil |
| 51 | + } |
| 52 | + return d.Open(d.name) |
| 53 | +} |
| 54 | + |
| 55 | +// Driver returns the underlying Driver of the Connector. |
| 56 | +func (d *connector) Driver() driver.Driver { |
| 57 | + return d |
| 58 | +} |
| 59 | + |
| 60 | +// Open returns a new connection to the database. |
| 61 | +func (d *connector) Open(name string) (driver.Conn, error) { |
| 62 | + results := sqlite.ConnectionOpen(name) |
| 63 | + if results.IsErr() { |
| 64 | + return nil, toError(results.Err()) |
| 65 | + } |
| 66 | + d.conn = &conn{ |
| 67 | + spinConn: *results.OK(), |
| 68 | + } |
| 69 | + return d.conn, nil |
| 70 | +} |
| 71 | + |
| 72 | +// Close closes the connection to the database. |
| 73 | +func (d *connector) Close() error { |
| 74 | + if d.conn != nil { |
| 75 | + d.conn.Close() |
| 76 | + } |
| 77 | + return nil |
| 78 | +} |
| 79 | + |
| 80 | +type rows struct { |
| 81 | + columns []string |
| 82 | + pos int |
| 83 | + len int |
| 84 | + rows [][]any |
| 85 | +} |
| 86 | + |
| 87 | +var _ driver.Rows = (*rows)(nil) |
| 88 | + |
| 89 | +// Columns return column names. |
| 90 | +func (r *rows) Columns() []string { |
| 91 | + return r.columns |
| 92 | +} |
| 93 | + |
| 94 | +// Close closes the rows iterator. |
| 95 | +func (r *rows) Close() error { |
| 96 | + r.rows = nil |
| 97 | + r.pos = 0 |
| 98 | + r.len = 0 |
| 99 | + return nil |
| 100 | +} |
| 101 | + |
| 102 | +// Next moves the cursor to the next row. |
| 103 | +func (r *rows) Next(dest []driver.Value) error { |
| 104 | + if !r.HasNextResultSet() { |
| 105 | + return io.EOF |
| 106 | + } |
| 107 | + for i := 0; i != len(r.columns); i++ { |
| 108 | + dest[i] = driver.Value(r.rows[r.pos][i]) |
| 109 | + } |
| 110 | + r.pos++ |
| 111 | + return nil |
| 112 | +} |
| 113 | + |
| 114 | +// HasNextResultSet is called at the end of the current result set and |
| 115 | +// reports whether there is another result set after the current one. |
| 116 | +func (r *rows) HasNextResultSet() bool { |
| 117 | + return r.pos < r.len |
| 118 | +} |
| 119 | + |
| 120 | +// NextResultSet advances the driver to the next result set even |
| 121 | +// if there are remaining rows in the current result set. |
| 122 | +// |
| 123 | +// NextResultSet should return io.EOF when there are no more result sets. |
| 124 | +func (r *rows) NextResultSet() error { |
| 125 | + if r.HasNextResultSet() { |
| 126 | + r.pos++ |
| 127 | + return nil |
| 128 | + } |
| 129 | + return io.EOF // Per interface spec. |
| 130 | +} |
| 131 | + |
| 132 | +type stmt struct { |
| 133 | + conn *conn |
| 134 | + query string |
| 135 | +} |
| 136 | + |
| 137 | +var _ driver.Stmt = (*stmt)(nil) |
| 138 | +var _ driver.ColumnConverter = (*stmt)(nil) |
| 139 | + |
| 140 | +// Close closes the statement. |
| 141 | +func (s *stmt) Close() error { |
| 142 | + return nil |
| 143 | +} |
| 144 | + |
| 145 | +// NumInput returns the number of placeholder parameters. |
| 146 | +func (s *stmt) NumInput() int { |
| 147 | + // Golang sql won't sanity check argument counts before Query. |
| 148 | + return -1 |
| 149 | +} |
| 150 | + |
| 151 | +func toRow(row []sqlite.Value) []any { |
| 152 | + ret := make([]any, len(row)) |
| 153 | + for i, v := range row { |
| 154 | + switch v.String() { |
| 155 | + case "integer": |
| 156 | + ret[i] = *v.Integer() |
| 157 | + case "real": |
| 158 | + ret[i] = *v.Real() |
| 159 | + case "text": |
| 160 | + ret[i] = *v.Text() |
| 161 | + case "blob": |
| 162 | + // TODO: check this |
| 163 | + ret[i] = *v.Blob() |
| 164 | + case "null": |
| 165 | + ret[i] = nil |
| 166 | + default: |
| 167 | + panic("unknown value type") |
| 168 | + } |
| 169 | + } |
| 170 | + return ret |
| 171 | +} |
| 172 | + |
| 173 | +func toWasiValue(x any) sqlite.Value { |
| 174 | + switch v := x.(type) { |
| 175 | + case int: |
| 176 | + return sqlite.ValueInteger(int64(v)) |
| 177 | + case int64: |
| 178 | + return sqlite.ValueInteger(v) |
| 179 | + case float64: |
| 180 | + return sqlite.ValueReal(v) |
| 181 | + case string: |
| 182 | + return sqlite.ValueText(v) |
| 183 | + case []byte: |
| 184 | + return sqlite.ValueBlob(cm.ToList([]uint8(v))) |
| 185 | + case nil: |
| 186 | + return sqlite.ValueNull() |
| 187 | + default: |
| 188 | + panic("unknown value type") |
| 189 | + } |
| 190 | +} |
| 191 | + |
| 192 | +// Query executes a query that may return rows, such as a SELECT. |
| 193 | +func (s *stmt) Query(args []driver.Value) (driver.Rows, error) { |
| 194 | + params := make([]sqlite.Value, len(args)) |
| 195 | + for i := range args { |
| 196 | + params[i] = toWasiValue(args[i]) |
| 197 | + } |
| 198 | + results := s.conn.spinConn.Execute(s.query, cm.ToList(params)) |
| 199 | + if results.IsErr() { |
| 200 | + return nil, toError(results.Err()) |
| 201 | + } |
| 202 | + |
| 203 | + okresult := results.OK() |
| 204 | + cols := okresult.Columns.Slice() |
| 205 | + |
| 206 | + rowLen := okresult.Rows.Len() |
| 207 | + allrows := make([][]any, rowLen) |
| 208 | + for rownum, row := range okresult.Rows.Slice() { |
| 209 | + allrows[rownum] = toRow(row.Values.Slice()) |
| 210 | + } |
| 211 | + rows := &rows{ |
| 212 | + columns: cols, |
| 213 | + rows: allrows, |
| 214 | + len: int(rowLen), |
| 215 | + } |
| 216 | + return rows, nil |
| 217 | +} |
| 218 | + |
| 219 | +// Exec executes a query that doesn't return rows, such as an INSERT or |
| 220 | +// UPDATE. |
| 221 | +func (s *stmt) Exec(args []driver.Value) (driver.Result, error) { |
| 222 | + params := make([]sqlite.Value, len(args)) |
| 223 | + for i := range args { |
| 224 | + params[i] = toWasiValue(args[i]) |
| 225 | + } |
| 226 | + results := s.conn.spinConn.Execute(s.query, cm.ToList(params)) |
| 227 | + if results.IsErr() { |
| 228 | + return nil, toError(results.Err()) |
| 229 | + } |
| 230 | + return &result{}, nil |
| 231 | +} |
| 232 | + |
| 233 | +// ColumnConverter returns GlobalParameterConverter to prevent using driver.DefaultParameterConverter. |
| 234 | +func (s *stmt) ColumnConverter(_ int) driver.ValueConverter { |
| 235 | + return spindb.GlobalParameterConverter |
| 236 | +} |
| 237 | + |
| 238 | +type result struct{} |
| 239 | + |
| 240 | +func (r result) LastInsertId() (int64, error) { |
| 241 | + return -1, errors.New("LastInsertId is unsupported by this driver") |
| 242 | +} |
| 243 | + |
| 244 | +func (r result) RowsAffected() (int64, error) { |
| 245 | + return -1, errors.New("RowsAffected is unsupported by this driver") |
| 246 | +} |
| 247 | + |
| 248 | +func toError(err *sqlite.Error) error { |
| 249 | + if err == nil { |
| 250 | + return nil |
| 251 | + } |
| 252 | + if err.String() == "io" { |
| 253 | + return fmt.Errorf("io: %s", *err.IO()) |
| 254 | + } |
| 255 | + return errors.New(err.String()) |
| 256 | +} |
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