Using spring JdbcTemplate in spring boot (2) - adding, deleting, modifying and checking CRUD

Continue with the previous article , use spring JdbcTemplate in spring boot (1) - connection pool to create multiple connections

Now let's take a look at how to use spring's JDBCTemplate to add, delete, modify, and query.

1. Add:

public int insert(JdbcTemplate jdbcTemplate) {
    String sql = "insert into student(id,name,age,address) values(?,?,?,?)";
    int row = jdbcTemplate.update(sql, 2, "xiaohong", 13, "bbb");
    return row;
}

2. Modify:

public int update(JdbcTemplate jdbcTemplate) {
    String sql = "update student set name=? where id= ?";
    int row = jdbcTemplate.update(sql, "xiaoxiao", 1);
    return row;
}

3. Delete

public int delete(JdbcTemplate jdbcTemplate) {
    String sql = "delete from student where id=?";
    int row = jdbcTemplate.update(sql, 2);
    return row;
}

4. Query

Query - query returns List<Map<String,Object> without parameters

public List<Map<String, Object>> query(JdbcTemplate jdbcTemplate) {
    String sql = "select * from student";
    return jdbcTemplate.queryForList(sql);
}

Query - query returns List<Map<String,Object>> with parameters

public List<Map<String, Object>> queryWithObject(JdbcTemplate jdbcTemplate) {
    String sql = "select * from student where id=?";
    return jdbcTemplate.queryForList(sql, 1);
}

Query - returns custom type, List<Student>

public List<Student> queryAndReturnObject(JdbcTemplate jdbcTemplate) {
    String sql = "select * from student";
    List<Student> students = jdbcTemplate.query(sql, new RowMapper<Student>() {
        @Override
        public Student mapRow(ResultSet resultSet, int i) throws SQLException {
            Student student = new Student();
            student.setId(resultSet.getInt("id"));
            student.setAddress(resultSet.getString("address"));
            student.setName(resultSet.getString("name"));
            student.setAge(resultSet.getInt("age"));
            return student;
        }
    });
    return students;
}

Query - return custom type, List<StudentNew>, do rowMapper in entity class

public class StudentNew implements RowMapper<StudentNew>, Serializable {
    private int id;
    private String name;
    private int age;
    private String address;


    public StudentNew() {
    }

    public StudentNew(int id, String name, int age, String address) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.address = address;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public StudentNew mapRow(ResultSet resultSet, int i) throws SQLException {
        StudentNew studentNew = new StudentNew();
        studentNew.setId(resultSet.getInt("id"));
        studentNew.setAge(resultSet.getInt("age"));
        studentNew.setName(resultSet.getString("name"));
        studentNew.setAddress(resultSet.getString("address"));
        return studentNew;
    }
}

public List<StudentNew> queryAndReturnObject2(JdbcTemplate jdbcTemplate) {
    String sql = "select * from student";
    List<StudentNew> studentNews = jdbcTemplate.query(sql, new StudentNew());
    return studentNews;
}

Query - conditional query returns List<StudentNew>

public List<StudentNew> queryAndReturnObject3(JdbcTemplate jdbcTemplate) {
    String sql = "select * from student where id =?";
    List<StudentNew> studentNews = jdbcTemplate.query(sql, new StudentNew(), 1);
    return studentNews;
}

To sum up, it is how to add, delete, modify and check in spring JdbcTemplate.