feat(cond): add logical NOT and NOT ILIKE operators

Add Cond.Not and Cond.NotILike to build NOT and NOT ILIKE expressions.

Closes #167

Author: vallahaye

cond.go

@@ -188,6 +188,15 @@ func (c *Cond) NotLike(field string, value interface{}) string {
 	return buf.String()
 }
 
+// NotILike represents "field NOT ILIKE value".
+func (c *Cond) NotILike(field string, value interface{}) string {
+	buf := newStringBuilder()
+	buf.WriteString(Escape(field))
+	buf.WriteString(" NOT ILIKE ")
+	buf.WriteString(c.Args.Add(value))
+	return buf.String()
+}
+
 // IsNull represents "field IS NULL".
 func (c *Cond) IsNull(field string) string {
 	buf := newStringBuilder()
@@ -244,6 +253,14 @@ func (c *Cond) And(andExpr ...string) string {
 	return buf.String()
 }
 
+// Not represents "NOT expr".
+func (c *Cond) Not(notExpr string) string {
+	buf := newStringBuilder()
+	buf.WriteString("NOT ")
+	buf.WriteString(notExpr)
+	return buf.String()
+}
+
 // Exists represents "EXISTS (subquery)".
 func (c *Cond) Exists(subquery interface{}) string {
 	buf := newStringBuilder()

cond_test.go

@@ -35,12 +35,14 @@ func TestCond(t *testing.T) {
 		"$$a LIKE $0":                 func() string { return newTestCond().Like("$a", "%Huan%") },
 		"$$a ILIKE $0":                func() string { return newTestCond().ILike("$a", "%Huan%") },
 		"$$a NOT LIKE $0":             func() string { return newTestCond().NotLike("$a", "%Huan%") },
+		"$$a NOT ILIKE $0":            func() string { return newTestCond().NotILike("$a", "%Huan%") },
 		"$$a IS NULL":                 func() string { return newTestCond().IsNull("$a") },
 		"$$a IS NOT NULL":             func() string { return newTestCond().IsNotNull("$a") },
 		"$$a BETWEEN $0 AND $1":       func() string { return newTestCond().Between("$a", 123, 456) },
 		"$$a NOT BETWEEN $0 AND $1":   func() string { return newTestCond().NotBetween("$a", 123, 456) },
 		"(1 = 1 OR 2 = 2 OR 3 = 3)":   func() string { return newTestCond().Or("1 = 1", "2 = 2", "3 = 3") },
 		"(1 = 1 AND 2 = 2 AND 3 = 3)": func() string { return newTestCond().And("1 = 1", "2 = 2", "3 = 3") },
+		"NOT 1 = 1":                   func() string { return newTestCond().Not("1 = 1") },
 		"EXISTS ($0)":                 func() string { return newTestCond().Exists(1) },
 		"NOT EXISTS ($0)":             func() string { return newTestCond().NotExists(1) },
 		"$$a > ANY ($0, $1)":          func() string { return newTestCond().Any("$a", ">", 1, 2) },