mirror of https://github.com/jackc/pgx.git
103 lines
2.4 KiB
Go
103 lines
2.4 KiB
Go
package pgx
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import (
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"fmt"
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"reflect"
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"github.com/jackc/pgx/v5/pgtype"
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)
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type extendedQueryBuilder struct {
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paramValues [][]byte
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paramValueBytes []byte
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paramFormats []int16
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resultFormats []int16
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}
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func (eqb *extendedQueryBuilder) AppendParam(m *pgtype.Map, oid uint32, arg interface{}) error {
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f := chooseParameterFormatCode(m, oid, arg)
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eqb.paramFormats = append(eqb.paramFormats, f)
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v, err := eqb.encodeExtendedParamValue(m, oid, f, arg)
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if err != nil {
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return err
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}
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eqb.paramValues = append(eqb.paramValues, v)
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return nil
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}
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func (eqb *extendedQueryBuilder) AppendResultFormat(f int16) {
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eqb.resultFormats = append(eqb.resultFormats, f)
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}
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// Reset readies eqb to build another query.
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func (eqb *extendedQueryBuilder) Reset() {
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eqb.paramValues = eqb.paramValues[0:0]
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eqb.paramValueBytes = eqb.paramValueBytes[0:0]
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eqb.paramFormats = eqb.paramFormats[0:0]
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eqb.resultFormats = eqb.resultFormats[0:0]
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if cap(eqb.paramValues) > 64 {
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eqb.paramValues = make([][]byte, 0, 64)
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}
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if cap(eqb.paramValueBytes) > 256 {
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eqb.paramValueBytes = make([]byte, 0, 256)
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}
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if cap(eqb.paramFormats) > 64 {
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eqb.paramFormats = make([]int16, 0, 64)
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}
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if cap(eqb.resultFormats) > 64 {
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eqb.resultFormats = make([]int16, 0, 64)
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}
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}
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func (eqb *extendedQueryBuilder) encodeExtendedParamValue(m *pgtype.Map, oid uint32, formatCode int16, arg interface{}) ([]byte, error) {
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if arg == nil {
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return nil, nil
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}
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refVal := reflect.ValueOf(arg)
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argIsPtr := refVal.Kind() == reflect.Ptr
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if argIsPtr && refVal.IsNil() {
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return nil, nil
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}
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if eqb.paramValueBytes == nil {
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eqb.paramValueBytes = make([]byte, 0, 128)
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}
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pos := len(eqb.paramValueBytes)
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if arg, ok := arg.(string); ok {
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return []byte(arg), nil
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}
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if argIsPtr {
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// We have already checked that arg is not pointing to nil,
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// so it is safe to dereference here.
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arg = refVal.Elem().Interface()
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return eqb.encodeExtendedParamValue(m, oid, formatCode, arg)
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}
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if _, ok := m.TypeForOID(oid); ok {
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buf, err := m.Encode(oid, formatCode, arg, eqb.paramValueBytes)
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if err != nil {
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return nil, err
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}
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if buf == nil {
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return nil, nil
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}
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eqb.paramValueBytes = buf
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return eqb.paramValueBytes[pos:], nil
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}
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if strippedArg, ok := stripNamedType(&refVal); ok {
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return eqb.encodeExtendedParamValue(m, oid, formatCode, strippedArg)
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}
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return nil, SerializationError(fmt.Sprintf("Cannot encode %T into oid %v - %T must implement Encoder or be converted to a string", arg, oid, arg))
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}
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