Consistent support for direct column matches in DataClassRowMapper

Closes gh-28243

spring-jdbc/src/main/java/org/springframework/jdbc/core/DataClassRowMapper.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -98,9 +98,18 @@ protected T constructMappedInstance(ResultSet rs, TypeConverter tc) throws SQLEx
 		if (this.constructorParameterNames != null && this.constructorParameterTypes != null) {
 			args = new Object[this.constructorParameterNames.length];
 			for (int i = 0; i < args.length; i++) {
-				String name = underscoreName(this.constructorParameterNames[i]);
+				String name = this.constructorParameterNames[i];
+				int index;
+				try {
+					// Try direct name match first
+					index = rs.findColumn(lowerCaseName(name));
+				}
+				catch (SQLException ex) {
+					// Try underscored name match instead
+					index = rs.findColumn(underscoreName(name));
+				}
 				TypeDescriptor td = this.constructorParameterTypes[i];
-				Object value = getColumnValue(rs, rs.findColumn(name), td.getType());
+				Object value = getColumnValue(rs, index, td.getType());
 				args[i] = tc.convertIfNecessary(value, td.getType(), td);
 			}
 		}

spring-jdbc/src/test/java/org/springframework/jdbc/core/AbstractRowMapperTests.java

@@ -20,6 +20,7 @@
 import java.sql.Connection;
 import java.sql.ResultSet;
 import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
 import java.sql.SQLFeatureNotSupportedException;
 import java.sql.Statement;
 import java.sql.Timestamp;
@@ -63,7 +64,7 @@ protected void verifyPerson(Person person) {
 	protected void verifyPerson(ConcretePerson person) {
 		assertThat(person.getName()).isEqualTo("Bubba");
 		assertThat(person.getAge()).isEqualTo(22L);
-		assertThat(person.getBirth_date()).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
+		assertThat(person.getBirthDate()).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
 		assertThat(person.getBalance()).isEqualTo(new BigDecimal("1234.56"));
 		verifyPersonViaBeanWrapper(person);
 	}
@@ -94,7 +95,14 @@ private void verifyPersonViaBeanWrapper(Object person) {
 		BeanWrapper bw = PropertyAccessorFactory.forBeanPropertyAccess(person);
 		assertThat(bw.getPropertyValue("name")).isEqualTo("Bubba");
 		assertThat(bw.getPropertyValue("age")).isEqualTo(22L);
-		assertThat((Date) bw.getPropertyValue("birth_date")).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
+		Date birthDate;
+		if (bw.isReadableProperty("birth_date")) {
+			birthDate = (Date) bw.getPropertyValue("birth_date");
+		}
+		else {
+			birthDate = (Date) bw.getPropertyValue("birthDate");
+		}
+		assertThat(birthDate).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
 		assertThat(bw.getPropertyValue("balance")).isEqualTo(new BigDecimal("1234.56"));
 	}
 
@@ -107,7 +115,7 @@ protected void verifyPerson(EmailPerson person) {
 	}
 
 
-	protected enum MockType {ONE, TWO, THREE}
+	protected enum MockType {ONE, TWO, THREE, FOUR}
 
 
 	protected static class Mock {
@@ -152,13 +160,19 @@ public Mock(MockType type) throws Exception {
 			given(resultSetMetaData.getColumnLabel(1)).willReturn(
 					type == MockType.THREE ? "Last Name" : "name");
 			given(resultSetMetaData.getColumnLabel(2)).willReturn("age");
-			given(resultSetMetaData.getColumnLabel(3)).willReturn("birth_date");
+			given(resultSetMetaData.getColumnLabel(3)).willReturn(type == MockType.FOUR ? "birthdate" :"birth_date");
 			given(resultSetMetaData.getColumnLabel(4)).willReturn("balance");
 			given(resultSetMetaData.getColumnLabel(5)).willReturn("e_mail");
 
 			given(resultSet.findColumn("name")).willReturn(1);
 			given(resultSet.findColumn("age")).willReturn(2);
-			given(resultSet.findColumn("birth_date")).willReturn(3);
+			if (type == MockType.FOUR) {
+				given(resultSet.findColumn("birthdate")).willReturn(3);
+			}
+			else {
+				given(resultSet.findColumn("birthdate")).willThrow(new SQLException());
+				given(resultSet.findColumn("birth_date")).willReturn(3);
+			}
 			given(resultSet.findColumn("balance")).willReturn(4);
 			given(resultSet.findColumn("e_mail")).willReturn(5);
 

spring-jdbc/src/test/java/org/springframework/jdbc/core/BeanPropertyRowMapperTests.java

@@ -140,6 +140,17 @@ void queryWithSpaceInColumnNameAndLocalDate() throws Exception {
 		mock.verifyClosed();
 	}
 
+	@Test
+	void queryWithDirectNameMatchOnBirthDate() throws Exception {
+		Mock mock = new Mock(MockType.FOUR);
+		List<ConcretePerson> result = mock.getJdbcTemplate().query(
+				"select name, age, birthdate, balance from people",
+				new BeanPropertyRowMapper<>(ConcretePerson.class));
+		assertThat(result).hasSize(1);
+		verifyPerson(result.get(0));
+		mock.verifyClosed();
+	}
+
 	@Test
 	void queryWithUnderscoreInColumnNameAndPersonWithMultipleAdjacentUppercaseLettersInPropertyName() throws Exception {
 		Mock mock = new Mock();

spring-jdbc/src/test/java/org/springframework/jdbc/core/DataClassRowMapperTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -57,23 +57,23 @@ public void testStaticQueryWithDataClassAndGenerics() throws Exception {
 		ConstructorPersonWithGenerics person = result.get(0);
 		assertThat(person.name()).isEqualTo("Bubba");
 		assertThat(person.age()).isEqualTo(22L);
-		assertThat(person.birth_date()).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
+		assertThat(person.birthDate()).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
 		assertThat(person.balance()).isEqualTo(Collections.singletonList(new BigDecimal("1234.56")));
 
 		mock.verifyClosed();
 	}
 
 	@Test
 	public void testStaticQueryWithDataClassAndSetters() throws Exception {
-		Mock mock = new Mock();
+		Mock mock = new Mock(MockType.FOUR);
 		List<ConstructorPersonWithSetters> result = mock.getJdbcTemplate().query(
-				"select name, age, birth_date, balance from people",
+				"select name, age, birthdate, balance from people",
 				new DataClassRowMapper<>(ConstructorPersonWithSetters.class));
 		assertThat(result.size()).isEqualTo(1);
 		ConstructorPersonWithSetters person = result.get(0);
 		assertThat(person.name()).isEqualTo("BUBBA");
 		assertThat(person.age()).isEqualTo(22L);
-		assertThat(person.birth_date()).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
+		assertThat(person.birthDate()).usingComparator(Date::compareTo).isEqualTo(new java.util.Date(1221222L));
 		assertThat(person.balance()).isEqualTo(new BigDecimal("1234.56"));
 
 		mock.verifyClosed();

spring-jdbc/src/test/java/org/springframework/jdbc/core/test/AbstractPerson.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -27,7 +27,7 @@ public abstract class AbstractPerson {
 
 	private long age;
 
-	private Date birth_date;
+	private Date birthDate;
 
 
 	public String getName() {
@@ -46,12 +46,12 @@ public void setAge(long age) {
 		this.age = age;
 	}
 
-	public Date getBirth_date() {
-		return birth_date;
+	public Date getBirthDate() {
+		return birthDate;
 	}
 
-	public void setBirth_date(Date birth_date) {
-		this.birth_date = birth_date;
+	public void setBirthDate(Date birthDate) {
+		this.birthDate = birthDate;
 	}
 
 }

spring-jdbc/src/test/java/org/springframework/jdbc/core/test/ConstructorPersonWithGenerics.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -29,15 +29,15 @@ public class ConstructorPersonWithGenerics {
 
 	private final long age;
 
-	private final Date birth_date;
+	private final Date birthDate;
 
 	private final List<BigDecimal> balance;
 
 
 	public ConstructorPersonWithGenerics(String name, long age, Date birth_date, List<BigDecimal> balance) {
 		this.name = name;
 		this.age = age;
-		this.birth_date = birth_date;
+		this.birthDate = birth_date;
 		this.balance = balance;
 	}
 
@@ -50,8 +50,8 @@ public long age() {
 		return this.age;
 	}
 
-	public Date birth_date() {
-		return this.birth_date;
+	public Date birthDate() {
+		return this.birthDate;
 	}
 
 	public List<BigDecimal> balance() {

spring-jdbc/src/test/java/org/springframework/jdbc/core/test/ConstructorPersonWithSetters.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -28,15 +28,15 @@ public class ConstructorPersonWithSetters {
 
 	private long age;
 
-	private Date birth_date;
+	private Date birthDate;
 
 	private BigDecimal balance;
 
 
-	public ConstructorPersonWithSetters(String name, long age, Date birth_date, BigDecimal balance) {
+	public ConstructorPersonWithSetters(String name, long age, Date birthDate, BigDecimal balance) {
 		this.name = name.toUpperCase();
 		this.age = age;
-		this.birth_date = birth_date;
+		this.birthDate = birthDate;
 		this.balance = balance;
 	}
 
@@ -49,8 +49,8 @@ public void setAge(long age) {
 		this.age = age;
 	}
 
-	public void setBirth_date(Date birth_date) {
-		this.birth_date = birth_date;
+	public void setBirthDate(Date birthDate) {
+		this.birthDate = birthDate;
 	}
 
 	public void setBalance(BigDecimal balance) {
@@ -65,8 +65,8 @@ public long age() {
 		return this.age;
 	}
 
-	public Date birth_date() {
-		return this.birth_date;
+	public Date birthDate() {
+		return this.birthDate;
 	}
 
 	public BigDecimal balance() {

spring-jdbc/src/test/java/org/springframework/jdbc/core/test/SpacePerson.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -60,8 +60,8 @@ public BigDecimal getBalance() {
 		return balance;
 	}
 
-	public void setBalance(BigDecimal balanace) {
-		this.balance = balanace;
+	public void setBalance(BigDecimal balance) {
+		this.balance = balance;
 	}
 
 }