Merge pull request eugenp#14757 from parthiv39731/PR-6880

BAEL-6880, How to replace deprecated jdbcTemplate.queryForObject and …

persistence-modules/spring-jdbc/src/main/java/com/baeldung/spring/jdbc/replacedeprecated/ReplaceDeprecatedApplication.java

@@ -0,0 +1,14 @@
+package com.baeldung.spring.jdbc.replacedeprecated;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+
+@SpringBootApplication
+@ComponentScan(basePackages = "com.baeldung.spring.jdbc.replacedeprecated")
+public class ReplaceDeprecatedApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(ReplaceDeprecatedApplication.class, args);
+    }
+}

persistence-modules/spring-jdbc/src/main/java/com/baeldung/spring/jdbc/replacedeprecated/StudentDaoWithDeprecatedJdbcTemplateMethods.java

@@ -0,0 +1,54 @@
+package com.baeldung.spring.jdbc.replacedeprecated;
+
+import com.baeldung.spring.jdbc.replacedeprecated.model.Student;
+import com.baeldung.spring.jdbc.replacedeprecated.model.StudentResultExtractor;
+import com.baeldung.spring.jdbc.replacedeprecated.model.StudentRowMapper;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.core.RowCountCallbackHandler;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public class StudentDaoWithDeprecatedJdbcTemplateMethods {
+    JdbcTemplate jdbcTemplate;
+
+    @Autowired
+    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
+        this.jdbcTemplate = jdbcTemplate;
+    }
+
+    public List<Student> getStudentsOfAgeAndGender(Integer age, String gender) {
+        String sql = "select student_id, student_name, age, gender, grade, state from student where age= ? and gender = ?";
+        Object[] args = {age, gender};
+        return jdbcTemplate.query(sql, args, new StudentRowMapper());
+    }
+
+    public List<Student> getStudentsOfAgeGenderAndGrade(Integer age, String gender, Integer grade) {
+        String sql = "select student_id, student_name, age, gender, grade, state from student where age= ? and gender = ? and grade = ?";
+        Object[] args = {age, gender, grade};
+        return jdbcTemplate.query(sql, args, new StudentRowMapper());
+    }
+
+    public List<Student> getStudentsOfGradeAndState(Integer grade, String state) {
+        String sql = "select student_id, student_name, age, gender, grade, state from student where grade = ? and state = ?";
+        Object[] args = {grade, state};
+        return jdbcTemplate.query(sql, args, new StudentResultExtractor());
+    }
+
+    public Student getStudentOfStudentIDAndGrade(Integer studentID, Integer grade) {
+        String sql = "select student_id, student_name, age, gender, grade, state from student where student_id = ? and grade = ?";
+        Object[] args = {studentID, grade};
+
+        return jdbcTemplate.queryForObject(sql, args, new StudentRowMapper());
+    }
+
+    public Integer getCountOfStudentsInAGradeFromAState(Integer grade, String state) {
+        String sql = "select student_id, student_name, age, gender, grade, state from student where grade = ? and state = ?";
+        Object[] args = {grade, state};
+        RowCountCallbackHandler countCallbackHandler = new RowCountCallbackHandler();
+        jdbcTemplate.query(sql, args, countCallbackHandler);
+        return countCallbackHandler.getRowCount();
+    }
+}

persistence-modules/spring-jdbc/src/main/java/com/baeldung/spring/jdbc/replacedeprecated/StudentDaoWithPreferredJdbcTemplateMethods.java

@@ -0,0 +1,56 @@
+package com.baeldung.spring.jdbc.replacedeprecated;
+
+import com.baeldung.spring.jdbc.replacedeprecated.model.Student;
+import com.baeldung.spring.jdbc.replacedeprecated.model.StudentResultExtractor;
+import com.baeldung.spring.jdbc.replacedeprecated.model.StudentRowMapper;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.core.RowCountCallbackHandler;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public class StudentDaoWithPreferredJdbcTemplateMethods {
+    JdbcTemplate jdbcTemplate;
+
+    @Autowired
+    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
+        this.jdbcTemplate = jdbcTemplate;
+    }
+
+    public List<Student> getStudentsOfAgeAndGender(Integer age, String gender) {
+        String sql = "select student_id, student_name, age, gender, grade, state from student where age= ? and gender = ?";
+        return jdbcTemplate.query(sql, new StudentRowMapper(), age, gender);
+    }
+
+    public List<Student> getStudentsOfAgeGenderAndGrade(Integer age, String gender, Integer grade) {
+        String sql = "select student_id, student_name, age, gender, grade, state from student where age= ? and gender = ? and grade = ?";
+        return jdbcTemplate.query(sql, new StudentRowMapper(), age, gender, grade);
+    }
+
+    public List<Student> getStudentsOfGradeAndState(Integer grade, String state) {
+        String sql = "select student_id, student_name, age, gender, grade, state from student where grade = ? and state = ?";
+        return jdbcTemplate.query(sql, new StudentResultExtractor(), grade, state);
+    }
+
+    public Student getStudentOfStudentIDAndGrade(Integer studentID, Integer grade) {
+        String sql = "select student_id, student_name, age, gender, grade, state from student where student_id = ? and grade = ?";
+
+        return jdbcTemplate.queryForObject(sql, new StudentRowMapper(), studentID, grade);
+    }
+
+    public Integer getCountOfGenderInAGrade(String gender, Integer grade) {
+        String sql = "select count(1) as total from student where gender = ? and grade = ?";
+
+        return jdbcTemplate.queryForObject(sql, Integer.class, gender, grade);
+    }
+
+    public Integer getCountOfStudentsInAGradeFromAState(Integer grade, String state) {
+        String sql = "select student_id, student_name, age, gender, grade, state from student where grade = ? and state = ?";
+
+        RowCountCallbackHandler countCallbackHandler = new RowCountCallbackHandler();
+        jdbcTemplate.query(sql, countCallbackHandler, grade, state);
+        return countCallbackHandler.getRowCount();
+    }
+}

persistence-modules/spring-jdbc/src/main/java/com/baeldung/spring/jdbc/replacedeprecated/model/Student.java

@@ -0,0 +1,60 @@
+package com.baeldung.spring.jdbc.replacedeprecated.model;
+
+public class Student {
+    private Integer studentId;
+    private String studentName;
+    private String studentGender;
+    private Integer age;
+    private Integer grade;
+
+    public Integer getStudentId() {
+        return studentId;
+    }
+
+    public void setStudentId(Integer studentId) {
+        this.studentId = studentId;
+    }
+
+    public String getStudentName() {
+        return studentName;
+    }
+
+    public void setStudentName(String studentName) {
+        this.studentName = studentName;
+    }
+
+    public String getStudentGender() {
+        return studentGender;
+    }
+
+    public void setStudentGender(String studentGender) {
+        this.studentGender = studentGender;
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    public void setAge(Integer age) {
+        this.age = age;
+    }
+
+    public Integer getGrade() {
+        return grade;
+    }
+
+    public void setGrade(Integer grade) {
+        this.grade = grade;
+    }
+
+    public String getState() {
+        return state;
+    }
+
+    public void setState(String state) {
+        this.state = state;
+    }
+
+    private String state;
+
+}

persistence-modules/spring-jdbc/src/main/java/com/baeldung/spring/jdbc/replacedeprecated/model/StudentResultExtractor.java

@@ -0,0 +1,26 @@
+package com.baeldung.spring.jdbc.replacedeprecated.model;
+
+import org.springframework.jdbc.core.ResultSetExtractor;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class StudentResultExtractor implements ResultSetExtractor<List<Student>> {
+    @Override
+    public List<Student> extractData(ResultSet rs) throws SQLException {
+        List<Student> students = new ArrayList<Student>();
+        while(rs.next()) {
+            Student student = new Student();
+            student.setStudentId(rs.getInt("student_id"));
+            student.setStudentName(rs.getString("student_name"));
+            student.setAge(rs.getInt("age"));
+            student.setStudentGender(rs.getString("gender"));
+            student.setGrade(rs.getInt("grade"));
+            student.setState(rs.getString("state"));
+            students.add(student);
+        }
+        return students;
+    }
+}

persistence-modules/spring-jdbc/src/main/java/com/baeldung/spring/jdbc/replacedeprecated/model/StudentRowMapper.java

@@ -0,0 +1,20 @@
+package com.baeldung.spring.jdbc.replacedeprecated.model;
+
+import org.springframework.jdbc.core.RowMapper;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+public class StudentRowMapper  implements RowMapper<Student> {
+    @Override
+    public Student mapRow(ResultSet rs, int rowNum) throws SQLException {
+        Student student = new Student();
+        student.setStudentId(rs.getInt("student_id"));
+        student.setStudentName(rs.getString("student_name"));
+        student.setAge(rs.getInt("age"));
+        student.setStudentGender(rs.getString("gender"));
+        student.setGrade(rs.getInt("grade"));
+        student.setState(rs.getString("state"));
+        return student;
+    }
+}

persistence-modules/spring-jdbc/src/main/resources/com/baeldung/spring/jdbc/replacedeprecated/application.properties

@@ -0,0 +1,5 @@
+# DataSource Configuration
+spring.datasource.url=jdbc:h2:mem:testdb
+spring.datasource.driverClassName=org.h2.Driver
+spring.datasource.username=user
+spring.datasource.password=  # Leave this empty

persistence-modules/spring-jdbc/src/main/resources/com/baeldung/spring/jdbc/replacedeprecated/drop_student.sql

@@ -0,0 +1 @@
+DROP TABLE student;

persistence-modules/spring-jdbc/src/main/resources/com/baeldung/spring/jdbc/replacedeprecated/student.sql

@@ -0,0 +1,98 @@
+
+CREATE TABLE student (
+    student_id INT AUTO_INCREMENT PRIMARY KEY,
+    student_name VARCHAR(255) NOT NULL,
+    age INT,
+    grade INT NOT NULL,
+    gender VARCHAR(10) NOT NULL,
+    state VARCHAR(100) NOT NULL
+);
+-- Student 1
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('John Smith', 18, 3, 'Male', 'California');
+
+-- Student 2
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Emily Johnson', 17, 2, 'Female', 'New York');
+
+-- Student 3
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Michael Davis', 4, 1, 'Male', 'Texas');
+
+-- Student 4
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Sophia Martinez', 2, 1, 'Female', 'Florida');
+
+-- Student 5
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('William Brown', 5, 5, 'Male', 'California');
+
+-- Student 6
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Olivia Garcia', 4, 2, 'Female', 'Texas');
+
+-- Student 7
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Ethan Rodriguez', 3, 1, 'Male', 'New York');
+
+-- Student 8
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Ava Hernandez', 2, 1, 'Female', 'Florida');
+
+-- Student 9
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('James Wilson', 5, 4, 'Male', 'Texas');
+
+-- Student 10
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Emma Miller', 3, 1, 'Female', 'California');
+
+-- Student 11
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Benjamin Brown', 4, 1, 'Male', 'New York');
+
+-- Student 12
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Mia Smith', 2, 1, 'Female', 'Florida');
+
+-- Student 13
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Daniel Johnson', 5, 4, 'Male', 'California');
+
+-- Student 14
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Ava Davis', 4, 2, 'Female', 'Texas');
+
+-- Student 15
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Matthew Martinez', 3, 1, 'Male', 'New York');
+
+-- Student 16
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Sophia Taylor', 2, 1, 'Female', 'Florida');
+
+-- Student 17
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Alexander White', 5, 4, 'Male', 'California');
+
+-- Student 18
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Olivia Johnson', 4, 2, 'Female', 'Texas');
+
+-- Student 19
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Christopher Lee', 3, 1, 'Male', 'New York');
+
+-- Student 20
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Emma Wilson', 2, 1, 'Female', 'Florida');
+
+-- Student 21
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Elijah Smith', 5, 3, 'Male', 'Texas');
+
+-- Student 22
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Isabella Davis', 4, 2, 'Female', 'California');
+
+-- Student 23
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Liam Johnson', 3, 1, 'Male', 'New York');
+
+-- Student 24
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Olivia Garcia', 2, 1, 'Female', 'Florida');
+
+-- Student 25
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Noah Rodriguez', 5, 3, 'Male', 'Texas');
+
+-- Student 26
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Sophia Hernandez', 4, 2, 'Female', 'California');
+
+-- Student 27
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Mason Smith', 3, 1, 'Male', 'New York');
+
+-- Student 28
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Ava Taylor', 2, 1, 'Female', 'Florida');
+
+-- Student 29
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('William Brown', 5, 5, 'Male', 'Texas');
+
+-- Student 30
+INSERT INTO student (student_name, age, grade, gender, state) VALUES ('Olivia Martinez', 4, 4, 'Female', 'California');