fix(mysql): handle export terminators and escaped quotes

crates/dbx-core/src/sql.rs

@@ -382,11 +382,11 @@ impl SqlStatementSplitter {
             }
 
             match ch {
-                '\'' if !self.in_double_quote && !self.in_backtick && self.previous != Some('\\') => {
+                '\'' if !self.in_double_quote && !self.in_backtick && !has_odd_trailing_backslashes(&self.buffer) => {
                     self.in_single_quote = !self.in_single_quote;
                     self.buffer.push(ch);
                 }
-                '"' if !self.in_single_quote && !self.in_backtick && self.previous != Some('\\') => {
+                '"' if !self.in_single_quote && !self.in_backtick && !has_odd_trailing_backslashes(&self.buffer) => {
                     self.in_double_quote = !self.in_double_quote;
                     self.buffer.push(ch);
                 }
@@ -522,6 +522,10 @@ impl SqlStatementSplitter {
     }
 }
 
+fn has_odd_trailing_backslashes(sql: &str) -> bool {
+    sql.as_bytes().iter().rev().take_while(|byte| **byte == b'\\').count() % 2 == 1
+}
+
 pub fn split_sql_statements(sql: &str) -> Vec<String> {
     split_sql_statements_with_options(sql, SqlParsingOptions::default())
 }
@@ -2457,6 +2461,39 @@ mod tests {
         );
     }
 
+    #[test]
+    fn closes_mysql_string_after_even_trailing_backslashes() {
+        let sql = r#"CREATE TABLE paths (value varchar(100) COMMENT 'Windows path\\'); DROP TABLE paths;"#;
+
+        assert_eq!(
+            split_sql_statements_for_database(sql, DatabaseType::Mysql),
+            vec![r#"CREATE TABLE paths (value varchar(100) COMMENT 'Windows path\\')"#, "DROP TABLE paths"]
+        );
+    }
+
+    #[test]
+    fn keeps_mysql_string_open_after_odd_trailing_backslashes() {
+        let sql = r#"INSERT INTO notes VALUES ('it\'s; still one value'); SELECT 1;"#;
+
+        assert_eq!(
+            split_sql_statements_for_database(sql, DatabaseType::Mysql),
+            vec![r#"INSERT INTO notes VALUES ('it\'s; still one value')"#, "SELECT 1"]
+        );
+    }
+
+    #[test]
+    fn closes_mysql_string_after_even_trailing_backslashes_across_chunks() {
+        let mut splitter =
+            SqlStatementSplitter::with_options(SqlParsingOptions::for_database_type(DatabaseType::Mysql));
+
+        assert!(splitter.push_chunk("CREATE TABLE paths (value varchar(100) COMMENT 'Windows path\\").is_empty());
+        assert_eq!(
+            splitter.push_chunk("\\'); DROP TABLE paths;"),
+            vec![r#"CREATE TABLE paths (value varchar(100) COMMENT 'Windows path\\')"#, "DROP TABLE paths"]
+        );
+        assert!(splitter.finish().is_empty());
+    }
+
     #[test]
     fn emits_trailing_statement_without_semicolon() {
         assert_eq!(