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新增 DefaultBeanResultMap

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zhouxy108 2024-10-03 16:27:19 +08:00
parent fda69cea6b
commit 7f31d477d6
4 changed files with 165 additions and 7 deletions
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5
README.md
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@ -1,3 +1,6 @@
# SimpleJDBC
对 JDBC 的简单封装。
之前遇到的一个老项目，没有引入任何 ORM 框架，使用的 JDK7 明明支持泛型，所依赖的 spring-jdbc 居然是没有泛型的远古版本，该项目又不允许随意添加依赖，对数据库的操作几乎都在写原生 JDBC。故自己写了几个工具类，对 JDBC 进行简单封装，有了这东西的雏形。
之前遇到的一个老项目，没有引入任何 ORM 框架，使用的 JDK7 明明支持泛型，所依赖的 spring-jdbc 居然是没有泛型的远古版本，该项目又不允许随意添加依赖，对数据库的操作几乎都在写原生 JDBC。故自己写了几个工具类，对 JDBC 进行简单封装，后来逐渐改进完善。
本项目不比成熟的工具，如若使用请自行承担风险。建议仅作为 JDBC 的学习参考。

88
src/main/java/xyz/zhouxy/jdbc/DefaultBeanResultMap.java Normal file
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@ -0,0 +1,88 @@
package xyz.zhouxy.jdbc;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;
import javax.annotation.Nullable;
public class DefaultBeanResultMap<T> implements ResultMap<T> {
private final Constructor<T> constructor;
private final Map<String, PropertyDescriptor> colPropertyMap;
private DefaultBeanResultMap(Constructor<T> constructor, Map<String, PropertyDescriptor> colPropertyMap) {
this.constructor = constructor;
this.colPropertyMap = colPropertyMap;
}
public static <T> DefaultBeanResultMap<T> of(Class<T> beanType) throws SQLException {
return of(beanType, null);
}
public static <T> DefaultBeanResultMap<T> of(Class<T> beanType, @Nullable Map<String, String> propertyColMap)
throws SQLException {
try {
BeanInfo beanInfo = Introspector.getBeanInfo(beanType);
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
Map<String, PropertyDescriptor> colPropertyMap;
if (propertyColMap != null && !propertyColMap.isEmpty()) {
colPropertyMap = Arrays.stream(propertyDescriptors)
.collect(Collectors.toMap(p -> {
String propertyName = p.getName();
String colName = propertyColMap.get(propertyName);
return colName != null ? colName : propertyName;
}, Function.identity(), (a, b) -> b));
}
else {
colPropertyMap = Arrays.stream(propertyDescriptors)
.collect(Collectors.toMap(PropertyDescriptor::getName, Function.identity(), (a, b) -> b));
}
Constructor<T> constructor = beanType.getDeclaredConstructor();
constructor.setAccessible(true); // NOSONAR
return new DefaultBeanResultMap<>(constructor, colPropertyMap);
}
catch (IntrospectionException e) {
throw new SQLException("There is an exception occurs during introspection.", e);
}
catch (NoSuchMethodException e) {
throw new SQLException("Could not find a no-args constructor in " + beanType.getName(), e);
}
}
@Override
public T map(ResultSet rs, int rowNumber) throws SQLException {
try {
T newInstance = this.constructor.newInstance();
ResultSetMetaData metaData = rs.getMetaData();
for (int i = 1; i <= metaData.getColumnCount(); i++) {
String colName = metaData.getColumnName(i);
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));
}
}
}
return newInstance;
}
catch (IllegalAccessException | InstantiationException | InvocationTargetException e) {
throw new SQLException(e);
}
}
}

10
src/main/java/xyz/zhouxy/jdbc/ResultMap.java
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@ -37,7 +37,6 @@ public interface ResultMap<T> {
return result;
};
public static final ResultMap<DbRecord> recordResultMap = (rs, rowNumber) -> {
DbRecord result = new DbRecord();
ResultSetMetaData metaData = rs.getMetaData();
@ -48,4 +47,13 @@ public interface ResultMap<T> {
}
return result;
};
public static <T> ResultMap<T> beanResultMap(Class<T> beanType) throws SQLException {
return DefaultBeanResultMap.of(beanType);
}
public static <T> ResultMap<T> beanResultMap(Class<T> beanType, Map<String, String> propertyColMap)
throws SQLException {
return DefaultBeanResultMap.of(beanType, propertyColMap);
}
}

69
src/test/java/xyz/zhouxy/jdbc/SimpleJdbcTemplateTests.java → src/test/java/xyz/zhouxy/jdbc/test/SimpleJdbcTemplateTests.java
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@ -1,4 +1,4 @@
package xyz.zhouxy.jdbc;
package xyz.zhouxy.jdbc.test;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
@ -6,6 +6,7 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
import static xyz.zhouxy.jdbc.ParamBuilder.*;
import static xyz.zhouxy.plusone.commons.sql.JdbcSql.IN;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.time.LocalDate;
import java.time.LocalDateTime;
@ -21,10 +22,15 @@ import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;
import xyz.zhouxy.jdbc.DbRecord;
import xyz.zhouxy.jdbc.DefaultBeanResultMap;
import xyz.zhouxy.jdbc.ResultMap;
import xyz.zhouxy.jdbc.SimpleJdbcTemplate;
import xyz.zhouxy.jdbc.SimpleJdbcTemplate.JdbcExecutor;
import xyz.zhouxy.plusone.commons.sql.SQL;
import xyz.zhouxy.plusone.commons.util.ArrayTools;
@ -53,20 +59,19 @@ class SimpleJdbcTemplateTests {
@Test
void testQuery() throws SQLException {
Object[] ids = buildParams("501533", "501554", "544599");
Object[] ids = buildParams(22915, 22916, 22917, 22918, 22919, 22920, 22921);
String sql = SQL.newJdbcSql()
.SELECT("*")
.FROM("test_table")
.WHERE(IN("id", ids))
.toString();
log.info(sql);
List<DbRecord> rs = jdbcTemplate
.queryToRecordList(sql, ids);
List<DbRecord> rs = jdbcTemplate.queryToRecordList(sql, ids);
assertNotNull(rs);
for (DbRecord baseEntity : rs) {
// log.info("id: {}", baseEntity.getValueAsString("id")); // NOSONAR
log.info(baseEntity.toString());
assertEquals(Optional.empty(), baseEntity.getValueAsString("updated_by"));
assertTrue(baseEntity.getValueAsString("username").isPresent());
}
}
@ -218,4 +223,58 @@ class SimpleJdbcTemplateTests {
throw e;
}
}
@Test
void testBean() throws Exception {
Optional<TestBean> t = jdbcTemplate.queryFirst(
"SELECT * FROM test_table WHERE id = ?",
buildParams(22915),
ResultMap.beanResultMap(TestBean.class, ImmutableMap.of("usageDate", "usage_date", "usageDuration", "usage_duration")));
log.info("t: {}", t);
}
}
class TestBean {
Long id;
String username;
LocalDate usageDate;
Long usageDuration;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public LocalDate getUsageDate() {
return usageDate;
}
public void setUsageDate(LocalDate usageDate) {
this.usageDate = usageDate;
}
public Long getUsageDuration() {
return usageDuration;
}
public void setUsageDuration(Long usageDuration) {
this.usageDuration = usageDuration;
}
@Override
public String toString() {
return "TestBean [id=" + id + ", username=" + username + ", usageDate=" + usageDate + ", usageDuration="
+ usageDuration + "]";
}
}