Merge pull request #3628 from dingqianwen/3.0

perf:NoKeyGenerator shared instance

mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/injector/AbstractMethod.java

@@ -288,7 +288,7 @@ public abstract class AbstractMethod implements Constants {
         if (null != resultMap) {
             /* 返回 resultMap 映射结果集 */
             return addMappedStatement(mapperClass, id, sqlSource, SqlCommandType.SELECT, null,
-                resultMap, null, new NoKeyGenerator(), null, null);
+                resultMap, null, NoKeyGenerator.INSTANCE, null, null);
         } else {
             /* 普通查询 */
             return addSelectMappedStatementForOther(mapperClass, id, sqlSource, table.getEntityType());
@@ -301,7 +301,7 @@ public abstract class AbstractMethod implements Constants {
     protected MappedStatement addSelectMappedStatementForOther(Class<?> mapperClass, String id, SqlSource sqlSource,
                                                                Class<?> resultType) {
         return addMappedStatement(mapperClass, id, sqlSource, SqlCommandType.SELECT, null,
-            null, resultType, new NoKeyGenerator(), null, null);
+            null, resultType, NoKeyGenerator.INSTANCE, null, null);
     }
 
     /**
@@ -319,7 +319,7 @@ public abstract class AbstractMethod implements Constants {
      */
     protected MappedStatement addDeleteMappedStatement(Class<?> mapperClass, String id, SqlSource sqlSource) {
         return addMappedStatement(mapperClass, id, sqlSource, SqlCommandType.DELETE, null,
-            null, Integer.class, new NoKeyGenerator(), null, null);
+            null, Integer.class, NoKeyGenerator.INSTANCE, null, null);
     }
 
     /**
@@ -328,7 +328,7 @@ public abstract class AbstractMethod implements Constants {
     protected MappedStatement addUpdateMappedStatement(Class<?> mapperClass, Class<?> parameterType, String id,
                                                        SqlSource sqlSource) {
         return addMappedStatement(mapperClass, id, sqlSource, SqlCommandType.UPDATE, parameterType, null,
-            Integer.class, new NoKeyGenerator(), null, null);
+            Integer.class, NoKeyGenerator.INSTANCE, null, null);
     }
 
     /**

mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/injector/methods/Insert.java

@@ -39,7 +39,7 @@ public class Insert extends AbstractMethod {
 
     @Override
     public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
-        KeyGenerator keyGenerator = new NoKeyGenerator();
+        KeyGenerator keyGenerator = NoKeyGenerator.INSTANCE;
         SqlMethod sqlMethod = SqlMethod.INSERT_ONE;
         String columnScript = SqlScriptUtils.convertTrim(tableInfo.getAllInsertSqlColumnMaybeIf(null),
             LEFT_BRACKET, RIGHT_BRACKET, null, COMMA);

mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/injector/methods/InsertBatchSomeColumn.java

@@ -76,7 +76,7 @@ public class InsertBatchSomeColumn extends AbstractMethod {
     @SuppressWarnings("Duplicates")
     @Override
     public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
-        KeyGenerator keyGenerator = new NoKeyGenerator();
+        KeyGenerator keyGenerator = NoKeyGenerator.INSTANCE;
         SqlMethod sqlMethod = SqlMethod.INSERT_ONE;
         List<TableFieldInfo> fieldList = tableInfo.getFieldList();
         String insertSqlColumn = tableInfo.getKeyInsertSqlColumn(false) +

mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/injector/methods/Upsert.java

@@ -36,7 +36,7 @@ public class Upsert extends AbstractMethod {
 
     @Override
     public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
-        KeyGenerator keyGenerator = new NoKeyGenerator();
+        KeyGenerator keyGenerator = NoKeyGenerator.INSTANCE;
         SqlMethod sqlMethod = SqlMethod.UPSERT_ONE;
         String columnScript = SqlScriptUtils.convertTrim(tableInfo.getAllInsertSqlColumnMaybeIf(null),
             LEFT_BRACKET, RIGHT_BRACKET, null, COMMA);