Backport fix from pgx v5 b52ef1574d6eeb821df0ad58eba40f04dd4561dd

fixes #210
jackc · Jan 13, 2024 · fdca434 · fdca434
1 parent cb24fcc
commit fdca434
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Showing 2 changed files with 25 additions and 0 deletions.
diff --git a/numeric.go b/numeric.go
@@ -829,6 +829,12 @@ func encodeNumericText(n Numeric, buf []byte) (newBuf []byte, err error) {
 func (n Numeric) numberTextBytes() []byte {
 	intStr := n.Int.String()
 	buf := &bytes.Buffer{}
+
+	if len(intStr) > 0 && intStr[:1] == "-" {
+		intStr = intStr[1:]
+		buf.WriteByte('-')
+	}
+
 	exp := int(n.Exp)
 	if exp > 0 {
 		buf.WriteString(intStr)

diff --git a/numeric_test.go b/numeric_test.go
@@ -423,3 +423,22 @@ func TestNumericEncodeDecodeBinary(t *testing.T) {
 		}
 	}
 }
+
+// https://github.com/jackc/pgtype/issues/210
+func TestNumericSmallNegativeValues(t *testing.T) {
+	n := pgtype.Numeric{}
+	err := n.Set("-0.000123")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	s := ""
+	err = n.AssignTo(&s)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if s != "-0.000123" {
+		t.Fatalf("expected %s, got %s", "-0.000123", s)
+	}
+}