fix: correctly escape backslash in queries (#10522)

# Which Problems Are Solved

While investigating a support ticket, it was discovered that some
queries using equals or not equals without case matching were not
correctly escaping the value to compare. If a value contained a
backslash (`\`) the row would not match.

# How the Problems Are Solved

- Fixed the escaping for backslash for `like` operations.
- Changed equals and not equals comparison without case matching to `=`
instead of `like`.

# Additional Changes

None

# Additional Context

- related to a support request
- requires backport to v.3 and v4.x

internal/database/database.go

@@ -206,6 +206,7 @@ func (c Config) Type() dialect.DatabaseType {
 }
 
 func EscapeLikeWildcards(value string) string {
+	value = strings.ReplaceAll(value, "\\", "\\\\")
 	value = strings.ReplaceAll(value, "%", "\\%")
 	value = strings.ReplaceAll(value, "_", "\\_")
 	return value

internal/query/search_query.go

@@ -288,9 +288,7 @@ func NewTextQuery(col Column, value string, compare TextComparison) (*textQuery,
 	}
 	// handle the comparisons which use (i)like and therefore need to escape potential wildcards in the value
 	switch compare {
-	case TextEqualsIgnoreCase,
-		TextNotEqualsIgnoreCase,
-		TextStartsWith,
+	case TextStartsWith,
 		TextStartsWithIgnoreCase,
 		TextEndsWith,
 		TextEndsWithIgnoreCase,
@@ -300,6 +298,8 @@ func NewTextQuery(col Column, value string, compare TextComparison) (*textQuery,
 	case TextEquals,
 		TextListContains,
 		TextNotEquals,
+		TextEqualsIgnoreCase,
+		TextNotEqualsIgnoreCase,
 		textCompareMax:
 		// do nothing
 	}
@@ -335,9 +335,9 @@ func (q *textQuery) comp() sq.Sqlizer {
 	case TextNotEquals:
 		return sq.NotEq{q.Column.identifier(): q.Text}
 	case TextEqualsIgnoreCase:
-		return sq.Like{"LOWER(" + q.Column.identifier() + ")": strings.ToLower(q.Text)}
+		return sq.Eq{"LOWER(" + q.Column.identifier() + ")": strings.ToLower(q.Text)}
 	case TextNotEqualsIgnoreCase:
-		return sq.NotLike{"LOWER(" + q.Column.identifier() + ")": strings.ToLower(q.Text)}
+		return sq.NotEq{"LOWER(" + q.Column.identifier() + ")": strings.ToLower(q.Text)}
 	case TextStartsWith:
 		return sq.Like{q.Column.identifier(): q.Text + "%"}
 	case TextStartsWithIgnoreCase:

internal/query/search_query_test.go

@@ -862,7 +862,7 @@ func TestNewTextQuery(t *testing.T) {
 			},
 			want: &textQuery{
 				Column:  testCol,
-				Text:    "hu\\%rst",
+				Text:    "hu%rst",
 				Compare: TextEqualsIgnoreCase,
 			},
 		},
@@ -875,7 +875,7 @@ func TestNewTextQuery(t *testing.T) {
 			},
 			want: &textQuery{
 				Column:  testCol,
-				Text:    "hu\\_rst",
+				Text:    "hu_rst",
 				Compare: TextEqualsIgnoreCase,
 			},
 		},
@@ -888,7 +888,7 @@ func TestNewTextQuery(t *testing.T) {
 			},
 			want: &textQuery{
 				Column:  testCol,
-				Text:    "h\\_urst\\%",
+				Text:    "h_urst%",
 				Compare: TextEqualsIgnoreCase,
 			},
 		},
@@ -914,7 +914,7 @@ func TestNewTextQuery(t *testing.T) {
 			},
 			want: &textQuery{
 				Column:  testCol,
-				Text:    "h\\_urst\\%",
+				Text:    "h_urst%",
 				Compare: TextNotEqualsIgnoreCase,
 			},
 		},
@@ -1204,7 +1204,7 @@ func TestTextQuery_comp(t *testing.T) {
 				Compare: TextEqualsIgnoreCase,
 			},
 			want: want{
-				query: sq.Like{"LOWER(test_table.test_col)": "hurst"},
+				query: sq.Eq{"LOWER(test_table.test_col)": "hurst"},
 			},
 		},
 		{
@@ -1226,7 +1226,7 @@ func TestTextQuery_comp(t *testing.T) {
 				Compare: TextNotEqualsIgnoreCase,
 			},
 			want: want{
-				query: sq.NotLike{"LOWER(test_table.test_col)": "hurst"},
+				query: sq.NotEq{"LOWER(test_table.test_col)": "hurst"},
 			},
 		},
 		{
@@ -1237,7 +1237,18 @@ func TestTextQuery_comp(t *testing.T) {
 				Compare: TextEqualsIgnoreCase,
 			},
 			want: want{
-				query: sq.Like{"LOWER(test_table.test_col)": "hu\\%\\%rst"},
+				query: sq.Eq{"LOWER(test_table.test_col)": "hu%%rst"},
+			},
+		},
+		{
+			name: "equals ignore case backslash",
+			fields: fields{
+				Column:  testCol,
+				Text:    "AD\\Hurst",
+				Compare: TextEqualsIgnoreCase,
+			},
+			want: want{
+				query: sq.Eq{"LOWER(test_table.test_col)": "ad\\hurst"},
 			},
 		},
 		{
@@ -1255,11 +1266,11 @@ func TestTextQuery_comp(t *testing.T) {
 			name: "starts with wildcards",
 			fields: fields{
 				Column:  testCol,
-				Text:    "_Hurst%",
+				Text:    "_Hur\\st%",
 				Compare: TextStartsWith,
 			},
 			want: want{
-				query: sq.Like{"test_table.test_col": "\\_Hurst\\%%"},
+				query: sq.Like{"test_table.test_col": "\\_Hur\\\\st\\%%"},
 			},
 		},
 		{