Add support for SQL mode NO_BACKSLASH_ESCAPES

r2dbc-mysql/src/main/java/io/asyncer/r2dbc/mysql/ConnectionContext.java

@@ -138,6 +138,10 @@ public boolean isMariaDb() {
         return (capability != null && capability.isMariaDb()) || serverVersion.isMariaDb();
     }
 
+    public boolean isNoBackslashEscapes() {
+        return (serverStatuses & ServerStatuses.NO_BACKSLASH_ESCAPES) != 0;
+    }
+
     void initTimeZone(ZoneId timeZone) {
         if (isTimeZoneInitialized()) {
             throw new IllegalStateException("Connection timezone have been initialized");

r2dbc-mysql/src/main/java/io/asyncer/r2dbc/mysql/MySqlSimpleConnection.java

@@ -563,7 +563,7 @@ private static Mono<SessionData> loadSessionVariables(Client client, Codecs code
     }
 
     private static Mono<SessionData> loadInnoDbEngineStatus(SessionData data, Client client, Codecs codecs) {
-        return new TextSimpleStatement(client, codecs, "SHOW VARIABLES LIKE 'innodb\\\\_lock\\\\_wait\\\\_timeout'")
+        return new TextSimpleStatement(client, codecs, "SHOW VARIABLES LIKE 'innodb\\_lock\\_wait\\_timeout'")
             .execute()
             .flatMap(r -> r.map(readable -> {
                 String value = readable.get(1, String.class);

r2dbc-mysql/src/main/java/io/asyncer/r2dbc/mysql/constant/ServerStatuses.java

@@ -50,12 +50,20 @@ public final class ServerStatuses {
     public static final short LAST_ROW_SENT = 128;
 
 //    public static final short DB_DROPPED = 256;
-//    public static final short NO_BACKSLASH_ESCAPES = 512;
+
+    /**
+     * Server does not permit backslash escapes.
+     *
+     * @since 1.1.3
+     */
+    public static final short NO_BACKSLASH_ESCAPES = 512;
+
 //    public static final short METADATA_CHANGED = 1024;
 //    public static final short QUERY_WAS_SLOW = 2048;
 //    public static final short PS_OUT_PARAMS = 4096;
 //    public static final short IN_TRANS_READONLY = 8192;
 //    public static final short SESSION_STATE_CHANGED = 16384;
 
-    private ServerStatuses() { }
+    private ServerStatuses() {
+    }
 }

r2dbc-mysql/src/main/java/io/asyncer/r2dbc/mysql/message/client/ParamWriter.java

@@ -45,14 +45,17 @@ final class ParamWriter extends ParameterWriter {
 
     private final StringBuilder builder;
 
+    private final boolean noBackslashEscapes;
+
     private final Query query;
 
     private int index;
 
     private Mode mode;
 
-    private ParamWriter(Query query) {
+    private ParamWriter(boolean noBackslashEscapes, Query query) {
         this.builder = newBuilder(query);
+        this.noBackslashEscapes = noBackslashEscapes;
         this.query = query;
         this.index = 1;
         this.mode = 1 < query.getPartSize() ? Mode.AVAILABLE : Mode.FULL;
@@ -318,15 +321,19 @@ private void write0(char[] s, int off, int len) {
     }
 
     private void escape(char c) {
+        if (c == '\'') {
+            // MySQL will auto-combine consecutive strings, whatever backslash is used or not, e.g. '1''2' -> '1\'2'
+            builder.append('\'').append('\'');
+            return;
+        } else if (noBackslashEscapes) {
+            builder.append(c);
+            return;
+        }
+
         switch (c) {
             case '\\':
                 builder.append('\\').append('\\');
                 break;
-            case '\'':
-                // MySQL will auto-combine consecutive strings, like '1''2' -> '12'.
-                // Sure, there can use '1\'2', but this will be better. (For some logging systems)
-                builder.append('\'').append('\'');
-                break;
             // Maybe useful in the future, keep '"' here.
             // case '"': buf.append('\\').append('"'); break;
             // SHIFT-JIS, WINDOWS-932, EUC-JP and eucJP-OPEN will encode '\u00a5' (the sign of Japanese Yen
@@ -335,20 +342,19 @@ private void escape(char c) {
             // case '\u00a5': do something; break;
             // case '\u20a9': do something; break;
             case 0:
-                // MySQL is based on C/C++, must escape '\0' which is an end flag in C style string.
+                // Should escape '\0' which is an end flag in C style string.
                 builder.append('\\').append('0');
                 break;
             case '\032':
-                // It seems like a problem on Windows 32, maybe check current OS here?
+                // It gives some problems on Win32.
                 builder.append('\\').append('Z');
                 break;
             case '\n':
-                // Should escape it for some logging such as Relational Database Service (RDS) Logging
-                // System, etc. Sure, it is not necessary, but this will be better.
+                // Should be escaped for better logging.
                 builder.append('\\').append('n');
                 break;
             case '\r':
-                // Should escape it for some logging such as RDS Logging System, etc.
+                // Should be escaped for better logging.
                 builder.append('\\').append('r');
                 break;
             default:
@@ -357,9 +363,9 @@ private void escape(char c) {
         }
     }
 
-    static Mono<String> publish(Query query, Flux<MySqlParameter> values) {
+    static Mono<String> publish(boolean noBackslashEscapes, Query query, Flux<MySqlParameter> values) {
         return Mono.defer(() -> {
-            ParamWriter writer = new ParamWriter(query);
+            ParamWriter writer = new ParamWriter(noBackslashEscapes, query);
 
             return OperatorUtils.discardOnCancel(values)
                 .doOnDiscard(MySqlParameter.class, DISPOSE)

r2dbc-mysql/src/main/java/io/asyncer/r2dbc/mysql/message/client/PreparedTextQueryMessage.java

@@ -87,7 +87,7 @@ public Mono<ByteBuf> encode(ByteBufAllocator allocator, ConnectionContext contex
             return Flux.fromArray(values);
         });
 
-        return ParamWriter.publish(query, parameters).handle((it, sink) -> {
+        return ParamWriter.publish(context.isNoBackslashEscapes(), query, parameters).handle((it, sink) -> {
             ByteBuf buf = allocator.buffer();
 
             try {

r2dbc-mysql/src/test/java/io/asyncer/r2dbc/mysql/ConnectionIntegrationTest.java

@@ -50,6 +50,7 @@
 import java.util.Collections;
 import java.util.Objects;
 import java.util.function.Function;
+import java.util.stream.Stream;
 
 import static io.r2dbc.spi.IsolationLevel.READ_COMMITTED;
 import static io.r2dbc.spi.IsolationLevel.READ_UNCOMMITTED;
@@ -80,6 +81,51 @@ void isInTransaction() {
             .doOnSuccess(ignored -> assertThat(connection.isInTransaction()).isFalse()));
     }
 
+    @ParameterizedTest
+    @ValueSource(strings = {
+        "test",
+        "test`data",
+        "test\ndata",
+        "I'm feeling good",
+    })
+    void sqlModeNoBackslashEscapes(String value) {
+        String tdl = "CREATE TEMPORARY TABLE `test` (`id` INT NOT NULL PRIMARY KEY, `value` VARCHAR(50) NOT NULL)";
+
+        // Add NO_BACKSLASH_ESCAPES instead of replace
+        // TODO: get context from connection, check if NO_BACKSLASH_ESCAPES is already in server statuses
+        castedComplete(connection -> Flux.from(connection.createStatement(tdl).execute())
+            .flatMap(MySqlResult::getRowsUpdated)
+            .thenMany(connection.createStatement("INSERT INTO test VALUES (1, ?)")
+                .bind(0, value)
+                .execute())
+            .flatMap(MySqlResult::getRowsUpdated)
+            .thenMany(connection.createStatement("SELECT COUNT(0) FROM `test` WHERE `value` = ?")
+                .bind(0, value)
+                .execute())
+            .flatMap(result -> result.map((row, metadata) -> row.get(0, Integer.class)))
+            .collectList()
+            .doOnNext(counts -> assertThat(counts).isEqualTo(Collections.singletonList(1)))
+            .thenMany(connection.createStatement("SELECT @@sql_mode").execute())
+            .flatMap(result -> result.map((row, metadata) -> row.get(0, String.class)))
+            .map(modes -> Stream.concat(Stream.of(modes.split(",")), Stream.of("NO_BACKSLASH_ESCAPES"))
+                .toArray(String[]::new))
+            .last()
+            .flatMapMany(modes -> connection.createStatement("SET sql_mode = ?")
+                .bind(0, modes)
+                .execute())
+            .flatMap(MySqlResult::getRowsUpdated)
+            .thenMany(connection.createStatement("INSERT INTO test VALUES (2, ?)")
+                .bind(0, value)
+                .execute())
+            .flatMap(MySqlResult::getRowsUpdated)
+            .thenMany(connection.createStatement("SELECT COUNT(0) FROM `test` WHERE `value` = ?")
+                .bind(0, value)
+                .execute())
+            .flatMap(result -> result.map((row, metadata) -> row.get(0, Integer.class)))
+            .collectList()
+            .doOnNext(counts -> assertThat(counts).isEqualTo(Collections.singletonList(2))));
+    }
+
     @DisabledIf("envIsLessThanMySql56")
     @Test
     void startTransaction() {

r2dbc-mysql/src/test/java/io/asyncer/r2dbc/mysql/codec/CodecTestSupport.java

@@ -91,7 +91,7 @@ default void encodeStringify() {
         Query query = Query.parse("?");
 
         for (int i = 0; i < origin.length; ++i) {
-            ParameterWriter writer = ParameterWriterHelper.get(query);
+            ParameterWriter writer = ParameterWriterHelper.get(false, query);
             codec.encode(origin[i], context())
                 .publishText(writer)
                 .as(StepVerifier::create)

r2dbc-mysql/src/test/java/io/asyncer/r2dbc/mysql/codec/SetCodecTest.java

@@ -129,7 +129,7 @@ void stringifySet() {
         Query query = Query.parse("?");
 
         for (int i = 0; i < sets.length; ++i) {
-            ParameterWriter writer = ParameterWriterHelper.get(query);
+            ParameterWriter writer = ParameterWriterHelper.get(false, query);
             codec.encode(sets[i], context())
                 .publishText(writer)
                 .as(StepVerifier::create)

r2dbc-mysql/src/test/java/io/asyncer/r2dbc/mysql/message/client/ParamWriterTest.java

@@ -18,6 +18,8 @@
 
 import io.asyncer.r2dbc.mysql.Query;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 import reactor.core.publisher.Flux;
 import reactor.test.StepVerifier;
 
@@ -84,42 +86,42 @@ void badFollowNull() {
 
     @Test
     void appendPart() {
-        ParamWriter writer = (ParamWriter) ParameterWriterHelper.get(parameterOnly(1));
+        ParamWriter writer = (ParamWriter) ParameterWriterHelper.get(false, parameterOnly(1));
         writer.append("define", 2, 5);
         assertThat(ParameterWriterHelper.toSql(writer)).isEqualTo("'fin'");
     }
 
     @Test
     void writePart() {
-        ParamWriter writer = (ParamWriter) ParameterWriterHelper.get(parameterOnly(1));
+        ParamWriter writer = (ParamWriter) ParameterWriterHelper.get(false, parameterOnly(1));
         writer.write("define", 2, 3);
         assertThat(ParameterWriterHelper.toSql(writer)).isEqualTo("'fin'");
     }
 
     @Test
     void appendNull() {
-        assertThat(ParameterWriterHelper.toSql(ParameterWriterHelper.get(parameterOnly(1)).append(null)))
+        assertThat(ParameterWriterHelper.toSql(ParameterWriterHelper.get(false, parameterOnly(1)).append(null)))
             .isEqualTo("'null'");
-        assertThat(ParameterWriterHelper.toSql(ParameterWriterHelper.get(parameterOnly(1))
+        assertThat(ParameterWriterHelper.toSql(ParameterWriterHelper.get(false, parameterOnly(1))
             .append(null, 1, 3)))
             .isEqualTo("'ul'");
     }
 
     @Test
     void writeNull() {
-        ParamWriter writer = (ParamWriter) ParameterWriterHelper.get(parameterOnly(1));
+        ParamWriter writer = (ParamWriter) ParameterWriterHelper.get(false, parameterOnly(1));
         writer.write((String) null);
         assertThat(ParameterWriterHelper.toSql(writer)).isEqualTo("'null'");
 
-        writer = (ParamWriter) ParameterWriterHelper.get(parameterOnly(1));
+        writer = (ParamWriter) ParameterWriterHelper.get(false, parameterOnly(1));
         writer.write((String) null, 1, 2);
         assertThat(ParameterWriterHelper.toSql(writer)).isEqualTo("'ul'");
 
-        writer = (ParamWriter) ParameterWriterHelper.get(parameterOnly(1));
+        writer = (ParamWriter) ParameterWriterHelper.get(false, parameterOnly(1));
         writer.write((char[]) null);
         assertThat(ParameterWriterHelper.toSql(writer)).isEqualTo("'null'");
 
-        writer = (ParamWriter) ParameterWriterHelper.get(parameterOnly(1));
+        writer = (ParamWriter) ParameterWriterHelper.get(false, parameterOnly(1));
         writer.write((char[]) null, 1, 2);
         assertThat(ParameterWriterHelper.toSql(writer)).isEqualTo("'ul'");
     }
@@ -132,7 +134,7 @@ void publishSuccess() {
             values[i] = new MockMySqlParameter(true);
         }
 
-        Flux.from(ParamWriter.publish(parameterOnly(SIZE), Flux.fromArray(values)))
+        Flux.from(ParamWriter.publish(false, parameterOnly(SIZE), Flux.fromArray(values)))
             .as(StepVerifier::create)
             .expectNext(new String(new char[SIZE]).replace("\0", "''"))
             .verifyComplete();
@@ -154,7 +156,7 @@ void publishPartially() {
             values[i] = new MockMySqlParameter(false);
         }
 
-        Flux.from(ParamWriter.publish(parameterOnly(SIZE), Flux.fromArray(values)))
+        Flux.from(ParamWriter.publish(false, parameterOnly(SIZE), Flux.fromArray(values)))
             .as(StepVerifier::create)
             .verifyError(MockException.class);
 
@@ -169,13 +171,30 @@ void publishNothing() {
             values[i] = new MockMySqlParameter(false);
         }
 
-        Flux.from(ParamWriter.publish(parameterOnly(SIZE), Flux.fromArray(values)))
+        Flux.from(ParamWriter.publish(false, parameterOnly(SIZE), Flux.fromArray(values)))
             .as(StepVerifier::create)
             .verifyError(MockException.class);
 
         assertThat(values).extracting(MockMySqlParameter::refCnt).containsOnly(0);
     }
 
+    @ParameterizedTest
+    @ValueSource(strings = {
+        "abc",
+        "a'b'c",
+        "a\nb\rc",
+        "a\"b\"c",
+        "a\\b\\c",
+        "a\0b\0c",
+        "a\u00a5b\u20a9c",
+        "a\032b\032c",
+    })
+    void noBackslashEscapes(String value) {
+        ParamWriter writer = (ParamWriter) ParameterWriterHelper.get(true, parameterOnly(1));
+        writer.write(value);
+        assertThat(ParameterWriterHelper.toSql(writer)).isEqualTo("'" + value.replaceAll("'", "''") + "'");
+    }
+
     private static Query parameterOnly(int parameters) {
         char[] chars = new char[parameters];
         Arrays.fill(chars, '?');
@@ -184,13 +203,13 @@ private static Query parameterOnly(int parameters) {
     }
 
     private static ParamWriter stringWriter() {
-        ParamWriter writer = (ParamWriter) ParameterWriterHelper.get(parameterOnly(1));
+        ParamWriter writer = (ParamWriter) ParameterWriterHelper.get(false, parameterOnly(1));
         writer.write('0');
         return writer;
     }
 
     private static ParamWriter nullWriter() {
-        ParamWriter writer = (ParamWriter) ParameterWriterHelper.get(parameterOnly(1));
+        ParamWriter writer = (ParamWriter) ParameterWriterHelper.get(false, parameterOnly(1));
         writer.writeNull();
         return writer;
     }

r2dbc-mysql/src/test/java/io/asyncer/r2dbc/mysql/message/client/ParameterWriterHelper.java

@@ -45,10 +45,10 @@ public final class ParameterWriterHelper {
         ReflectionUtils.findMethod(ParamWriter.class, "toSql")
             .orElseThrow(RuntimeException::new);
 
-    public static ParameterWriter get(Query query) {
+    public static ParameterWriter get(boolean noBackslashEscapes, Query query) {
         assertThat(query.getPartSize()).isGreaterThan(1);
 
-        return ReflectionUtils.newInstance(CONSTRUCTOR, query);
+        return ReflectionUtils.newInstance(CONSTRUCTOR, noBackslashEscapes, query);
     }
 
     public static String toSql(ParameterWriter writer) {