plusone/simple-jdbc
1
0
Fork 1
Code Issues Pull Requests Packages Projects Releases 4 Wiki Activity

perf: 优化 DefaultBeanRowMapper 性能

Browse Source 
- 在初始化时预构建并缓存 setter 映射以减少运行时反射调用
- 移除重复的 setter 访问设置逻辑
This commit is contained in:
ZhouXY108
2026-05-23 04:59:43 +08:00
parent a6073e34b5
commit 7ddaea2400
1 changed files with 29 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
src/main/java/xyz/zhouxy/jdbc/DefaultBeanRowMapper.java
View File

@@ -1,5 +1,5 @@
/*
* Copyright 2022-2025 the original author or authors.
* Copyright 2026-present 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.
@@ -27,6 +27,7 @@ import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;
@@ -65,9 +66,15 @@ public class DefaultBeanRowMapper<T> implements RowMapper<T> {
/** 列名到属性的映射 */
private final Map<String, PropertyDescriptor> colPropertyMap;
private DefaultBeanRowMapper(Constructor<T> constructor, Map<String, PropertyDescriptor> colPropertyMap) {
/** 列名与 setter 的映射 */
private final Map<String, Method> colSetterMap;
private DefaultBeanRowMapper(Constructor<T> constructor,
Map<String, PropertyDescriptor> colPropertyMap,
Map<String, Method> colSetterMap) {
this.constructor = constructor;
this.colPropertyMap = colPropertyMap;
this.colSetterMap = colSetterMap;
}
/**
@@ -101,7 +108,8 @@ public class DefaultBeanRowMapper<T> implements RowMapper<T> {
constructor.setAccessible(true); // NOSONAR
final Map<String, PropertyDescriptor> colPropertyMap = buildColPropertyMap(beanType, propertyColMap);
return new DefaultBeanRowMapper<>(constructor, colPropertyMap);
final Map<String, Method> colSetterMap = buildColSetterMap(colPropertyMap);
return new DefaultBeanRowMapper<>(constructor, colPropertyMap, colSetterMap);
}
catch (IntrospectionException e) {
throw new SQLException("There is an exception occurs during introspection.", e);
@@ -123,13 +131,10 @@ public class DefaultBeanRowMapper<T> implements RowMapper<T> {
String colName = metaData.getColumnLabel(i);
// 获取查询结果列名对应的属性，调用 setter
PropertyDescriptor propertyDescriptor = this.colPropertyMap.get(colName);
if (propertyDescriptor != null) {
Method setter = propertyDescriptor.getWriteMethod();
if (setter != null) {
Class<?> propertyType = propertyDescriptor.getPropertyType();
setter.setAccessible(true); // NOSONAR
setter.invoke(newInstance, rs.getObject(colName, propertyType));
}
Method setter = this.colSetterMap.get(colName);
if (propertyDescriptor != null && setter != null) {
Class<?> propertyType = propertyDescriptor.getPropertyType();
setter.invoke(newInstance, rs.getObject(colName, propertyType));
}
}
return newInstance;
@@ -149,7 +154,7 @@ public class DefaultBeanRowMapper<T> implements RowMapper<T> {
* @throws IntrospectionException if an exception occurs during introspection.
*/
private static <T> Map<String, PropertyDescriptor> buildColPropertyMap(
Class<T> beanType, Map<String, String> propertyColMap) throws IntrospectionException {
Class<T> beanType, Map<String, String> propertyColMap) throws IntrospectionException {
BeanInfo beanInfo = Introspector.getBeanInfo(beanType);
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
@@ -168,6 +173,18 @@ public class DefaultBeanRowMapper<T> implements RowMapper<T> {
};
}
return Arrays.stream(propertyDescriptors)
.collect(Collectors.toMap(keyMapper, Function.identity(), (a, b) -> b));
.collect(Collectors.toMap(keyMapper, Function.identity(), (a, b) -> b));
}
private static Map<String, Method> buildColSetterMap(Map<String, PropertyDescriptor> colPropertyMap) {
final Map<String, Method> colSetterMap = new HashMap<>(colPropertyMap.size());
colPropertyMap.forEach((col, propertyDescriptor) -> {
Method setter = propertyDescriptor.getWriteMethod();
if (setter != null) {
setter.setAccessible(true); // NOSONAR
colSetterMap.put(col, setter);
}
});
return colSetterMap;
}
}