A new option (shrinkWhitespacesInSql) to remove extra whitespaces from SQL

src/main/java/org/apache/ibatis/builder/SqlSourceBuilder.java

@@ -1,5 +1,5 @@
 /**
- *    Copyright 2009-2019 the original author or authors.
+ *    Copyright 2009-2020 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -18,6 +18,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.StringTokenizer;
 
 import org.apache.ibatis.mapping.ParameterMapping;
 import org.apache.ibatis.mapping.SqlSource;
@@ -42,10 +43,29 @@ public SqlSourceBuilder(Configuration configuration) {
   public SqlSource parse(String originalSql, Class<?> parameterType, Map<String, Object> additionalParameters) {
     ParameterMappingTokenHandler handler = new ParameterMappingTokenHandler(configuration, parameterType, additionalParameters);
     GenericTokenParser parser = new GenericTokenParser("#{", "}", handler);
-    String sql = parser.parse(originalSql);
+    String sql;
+    if (configuration.isShrinkWhitespacesInSql()) {
+      sql = parser.parse(removeExtraWhitespaces(originalSql));
+    } else {
+      sql = parser.parse(originalSql);
+    }
     return new StaticSqlSource(configuration, sql, handler.getParameterMappings());
   }
 
+  public static String removeExtraWhitespaces(String original) {
+    StringTokenizer tokenizer = new StringTokenizer(original);
+    StringBuilder builder = new StringBuilder();
+    boolean hasMoreTokens = tokenizer.hasMoreTokens();
+    while (hasMoreTokens) {
+      builder.append(tokenizer.nextToken());
+      hasMoreTokens = tokenizer.hasMoreTokens();
+      if (hasMoreTokens) {
+        builder.append(' ');
+      }
+    }
+    return builder.toString();
+  }
+
   private static class ParameterMappingTokenHandler extends BaseBuilder implements TokenHandler {
 
     private List<ParameterMapping> parameterMappings = new ArrayList<>();

src/main/java/org/apache/ibatis/builder/xml/XMLConfigBuilder.java

@@ -268,6 +268,7 @@ private void settingsElement(Properties props) {
     configuration.setReturnInstanceForEmptyRow(booleanValueOf(props.getProperty("returnInstanceForEmptyRow"), false));
     configuration.setLogPrefix(props.getProperty("logPrefix"));
     configuration.setConfigurationFactory(resolveClass(props.getProperty("configurationFactory")));
+    configuration.setShrinkWhitespacesInSql(booleanValueOf(props.getProperty("shrinkWhitespacesInSql"), false));
   }
 
   private void environmentsElement(XNode context) throws Exception {

src/main/java/org/apache/ibatis/logging/jdbc/BaseJdbcLogger.java

@@ -1,5 +1,5 @@
 /**
- *    Copyright 2009-2019 the original author or authors.
+ *    Copyright 2009-2020 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -26,9 +26,9 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
-import java.util.StringTokenizer;
 import java.util.stream.Collectors;
 
+import org.apache.ibatis.builder.SqlSourceBuilder;
 import org.apache.ibatis.logging.Log;
 import org.apache.ibatis.reflection.ArrayUtil;
 
@@ -120,14 +120,8 @@ protected void clearColumnInfo() {
     columnValues.clear();
   }
 
-  protected String removeBreakingWhitespace(String original) {
-    StringTokenizer whitespaceStripper = new StringTokenizer(original);
-    StringBuilder builder = new StringBuilder();
-    while (whitespaceStripper.hasMoreTokens()) {
-      builder.append(whitespaceStripper.nextToken());
-      builder.append(" ");
-    }
-    return builder.toString();
+  protected String removeExtraWhitespace(String original) {
+    return SqlSourceBuilder.removeExtraWhitespaces(original);
   }
 
   protected boolean isDebugEnabled() {

src/main/java/org/apache/ibatis/logging/jdbc/ConnectionLogger.java

@@ -50,7 +50,7 @@ public Object invoke(Object proxy, Method method, Object[] params)
       }
       if ("prepareStatement".equals(method.getName()) || "prepareCall".equals(method.getName())) {
         if (isDebugEnabled()) {
-          debug(" Preparing: " + removeBreakingWhitespace((String) params[0]), true);
+          debug(" Preparing: " + removeExtraWhitespace((String) params[0]), true);
         }
         PreparedStatement stmt = (PreparedStatement) method.invoke(connection, params);
         stmt = PreparedStatementLogger.newInstance(stmt, statementLog, queryStack);

src/main/java/org/apache/ibatis/logging/jdbc/StatementLogger.java

@@ -48,7 +48,7 @@ public Object invoke(Object proxy, Method method, Object[] params) throws Throwa
       }
       if (EXECUTE_METHODS.contains(method.getName())) {
         if (isDebugEnabled()) {
-          debug(" Executing: " + removeBreakingWhitespace((String) params[0]), true);
+          debug(" Executing: " + removeExtraWhitespace((String) params[0]), true);
         }
         if ("executeQuery".equals(method.getName())) {
           ResultSet rs = (ResultSet) method.invoke(statement, params);

src/main/java/org/apache/ibatis/session/Configuration.java

@@ -113,6 +113,7 @@ public class Configuration {
   protected boolean callSettersOnNulls;
   protected boolean useActualParamName = true;
   protected boolean returnInstanceForEmptyRow;
+  protected boolean shrinkWhitespacesInSql;
 
   protected String logPrefix;
   protected Class<? extends Log> logImpl;
@@ -266,6 +267,14 @@ public void setReturnInstanceForEmptyRow(boolean returnEmptyInstance) {
     this.returnInstanceForEmptyRow = returnEmptyInstance;
   }
 
+  public boolean isShrinkWhitespacesInSql() {
+    return shrinkWhitespacesInSql;
+  }
+
+  public void setShrinkWhitespacesInSql(boolean shrinkWhitespacesInSql) {
+    this.shrinkWhitespacesInSql = shrinkWhitespacesInSql;
+  }
+
   public String getDatabaseId() {
     return databaseId;
   }

src/site/es/xdoc/configuration.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
 
-       Copyright 2009-2019 the original author or authors.
+       Copyright 2009-2020 the original author or authors.
 
        Licensed under the Apache License, Version 2.0 (the "License");
        you may not use this file except in compliance with the License.
@@ -547,6 +547,20 @@ SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader, environ
                 Not set
               </td>
             </tr>
+            <tr>
+              <td>
+                shrinkWhitespacesInSql
+              </td>
+              <td>
+                Removes extra whitespace characters from the SQL. Note that this also affects literal strings in SQL. (Since 3.5.5)
+              </td>
+              <td>
+                true | false
+              </td>
+              <td>
+                false
+              </td>
+            </tr>
           </tbody>
         </table>
         <p>

src/site/ja/xdoc/configuration.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
 
-       Copyright 2009-2019 the original author or authors.
+       Copyright 2009-2020 the original author or authors.
 
        Licensed under the Apache License, Version 2.0 (the "License");
        you may not use this file except in compliance with the License.
@@ -572,6 +572,20 @@ SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader, environ
                 未指定
               </td>
             </tr>
+            <tr>
+              <td>
+                shrinkWhitespacesInSql
+              </td>
+              <td>
+                SQL 内の余分な空白文字を削除します。リテラル文字列も対象となる点に注意してください。（導入されたバージョン: 3.5.5）
+              </td>
+              <td>
+                true | false
+              </td>
+              <td>
+                false
+              </td>
+            </tr>
           </tbody>
         </table>
         <p>

src/site/ko/xdoc/configuration.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
 
-       Copyright 2009-2019 the original author or authors.
+       Copyright 2009-2020 the original author or authors.
 
        Licensed under the Apache License, Version 2.0 (the "License");
        you may not use this file except in compliance with the License.
@@ -555,6 +555,20 @@ SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader, environ
                 설정하지 않음
               </td>
             </tr>
+            <tr>
+              <td>
+                shrinkWhitespacesInSql
+              </td>
+              <td>
+                SQL에서 여분의 whitespace 문자들을 삭제한다. 이는 SQL의 리터럴 문자열에도 영향을 미친다. (Since 3.5.5)
+              </td>
+              <td>
+                true | false
+              </td>
+              <td>
+                false
+              </td>
+            </tr>
           </tbody>
         </table>
         <p>위 설정을 모두 사용한 setting 엘리먼트의 예제이다:</p>

src/site/xdoc/configuration.xml

@@ -1,7 +1,7 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!--
 
-       Copyright 2009-2019 the original author or authors.
+       Copyright 2009-2020 the original author or authors.
 
        Licensed under the Apache License, Version 2.0 (the "License");
        you may not use this file except in compliance with the License.
@@ -634,6 +634,20 @@ SqlSessionFactory factory =
                 Not set
               </td>
             </tr>
+            <tr>
+              <td>
+                shrinkWhitespacesInSql
+              </td>
+              <td>
+                Removes extra whitespace characters from the SQL. Note that this also affects literal strings in SQL. (Since 3.5.5)
+              </td>
+              <td>
+                true | false
+              </td>
+              <td>
+                false
+              </td>
+            </tr>
           </tbody>
         </table>
         <p>

src/site/zh/xdoc/configuration.xml

@@ -565,6 +565,20 @@ SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader, environ
                 未设置
               </td>
             </tr>
+            <tr>
+              <td>
+                shrinkWhitespacesInSql
+              </td>
+              <td>
+                Removes extra whitespace characters from the SQL. Note that this also affects literal strings in SQL. (Since 3.5.5)
+              </td>
+              <td>
+                true | false
+              </td>
+              <td>
+                false
+              </td>
+            </tr>
           </tbody>
         </table>
         <p>

src/test/java/org/apache/ibatis/builder/CustomizedSettingsMapperConfig.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!--
 
-       Copyright 2009-2019 the original author or authors.
+       Copyright 2009-2020 the original author or authors.
 
        Licensed under the Apache License, Version 2.0 (the "License");
        you may not use this file except in compliance with the License.
@@ -54,6 +54,7 @@
     <setting name="vfsImpl" value="org.apache.ibatis.io.JBoss6VFS"/>
     <setting name="configurationFactory" value="java.lang.String"/>
     <setting name="defaultEnumTypeHandler" value="org.apache.ibatis.type.EnumOrdinalTypeHandler"/>
+    <setting name="shrinkWhitespacesInSql" value="true"/>
   </settings>
 
   <typeAliases>

src/test/java/org/apache/ibatis/builder/SqlSourceBuilderTest.java

@@ -0,0 +1,56 @@
+/**
+ *    Copyright 2009-2020 the original author or authors.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+package org.apache.ibatis.builder;
+
+import org.apache.ibatis.mapping.BoundSql;
+import org.apache.ibatis.mapping.SqlSource;
+import org.apache.ibatis.session.Configuration;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class SqlSourceBuilderTest {
+
+  private static Configuration configuration;
+  private static SqlSourceBuilder sqlSourceBuilder;
+  private final String sqlFromXml = "\t\n\n  SELECT * \n        FROM user\n \t        WHERE user_id = 1\n\t  ";
+
+  @BeforeEach
+  void setUp() {
+    configuration = new Configuration();
+
+    sqlSourceBuilder = new SqlSourceBuilder(configuration);
+  }
+
+  @Test
+  void testShrinkWhitespacesInSqlIsFalse() {
+    SqlSource sqlSource = sqlSourceBuilder.parse(sqlFromXml, null, null);
+    BoundSql boundSql = sqlSource.getBoundSql(null);
+    String actual = boundSql.getSql();
+    Assertions.assertEquals(sqlFromXml, actual);
+  }
+
+  @Test
+  void testShrinkWhitespacesInSqlIsTrue() {
+    configuration.setShrinkWhitespacesInSql(true);
+    SqlSource sqlSource = sqlSourceBuilder.parse(sqlFromXml, null, null);
+    BoundSql boundSql = sqlSource.getBoundSql(null);
+    String actual = boundSql.getSql();
+
+    String shrankWhitespacesInSql = "SELECT * FROM user WHERE user_id = 1";
+    Assertions.assertEquals(shrankWhitespacesInSql, actual);
+  }
+}

src/test/java/org/apache/ibatis/builder/XmlConfigBuilderTest.java

@@ -100,6 +100,7 @@ void shouldSuccessfullyLoadMinimalXMLConfigFile() throws Exception {
       assertNull(config.getLogImpl());
       assertNull(config.getConfigurationFactory());
       assertThat(config.getTypeHandlerRegistry().getTypeHandler(RoundingMode.class)).isInstanceOf(EnumTypeHandler.class);
+      assertThat(config.isShrinkWhitespacesInSql()).isFalse();
     }
   }
 
@@ -194,6 +195,7 @@ void shouldSuccessfullyLoadXMLConfigFile() throws Exception {
       assertThat(config.getLogImpl().getName()).isEqualTo(Slf4jImpl.class.getName());
       assertThat(config.getVfsImpl().getName()).isEqualTo(JBoss6VFS.class.getName());
       assertThat(config.getConfigurationFactory().getName()).isEqualTo(String.class.getName());
+      assertThat(config.isShrinkWhitespacesInSql()).isTrue();
 
       assertThat(config.getTypeAliasRegistry().getTypeAliases().get("blogauthor")).isEqualTo(Author.class);
       assertThat(config.getTypeAliasRegistry().getTypeAliases().get("blog")).isEqualTo(Blog.class);

src/test/java/org/apache/ibatis/builder/xsd/CustomizedSettingsMapperConfig.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!--
 
-       Copyright 2009-2019 the original author or authors.
+       Copyright 2009-2020 the original author or authors.
 
        Licensed under the Apache License, Version 2.0 (the "License");
        you may not use this file except in compliance with the License.
@@ -50,6 +50,7 @@
     <setting name="logImpl" value="SLF4J"/>
     <setting name="vfsImpl" value="org.apache.ibatis.io.JBoss6VFS"/>
     <setting name="configurationFactory" value="java.lang.String"/>
+    <setting name="shrinkWhitespacesInSql" value="true"/>
   </settings>
 
   <typeAliases>

src/test/java/org/apache/ibatis/builder/xsd/XmlConfigBuilderTest.java

@@ -84,6 +84,7 @@ void shouldSuccessfullyLoadMinimalXMLConfigFile() throws Exception {
       assertNull(config.getLogPrefix());
       assertNull(config.getLogImpl());
       assertNull(config.getConfigurationFactory());
+      assertFalse(config.isShrinkWhitespacesInSql());
     } finally {
       // System.clearProperty(XPathParser.KEY_USE_XSD);
     }
@@ -121,6 +122,7 @@ void shouldSuccessfullyLoadXMLConfigFile() throws Exception {
       assertEquals(Slf4jImpl.class.getName(), config.getLogImpl().getName());
       assertEquals(JBoss6VFS.class.getName(), config.getVfsImpl().getName());
       assertEquals(String.class.getName(), config.getConfigurationFactory().getName());
+      assertTrue(config.isShrinkWhitespacesInSql());
 
       assertEquals(Author.class, config.getTypeAliasRegistry().getTypeAliases().get("blogauthor"));
       assertEquals(Blog.class, config.getTypeAliasRegistry().getTypeAliases().get("blog"));