feat: persist project study time by student

src/main/java/com/sztzjy/linkCommerce/config/StudentProjectStudyTimeSchemaInitializer.java

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+package com.sztzjy.linkCommerce.config;
+
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.stereotype.Component;
+
+import javax.annotation.PostConstruct;
+
+@Component
+public class StudentProjectStudyTimeSchemaInitializer {
+    private final JdbcTemplate jdbcTemplate;
+
+    public StudentProjectStudyTimeSchemaInitializer(JdbcTemplate jdbcTemplate) {
+        this.jdbcTemplate = jdbcTemplate;
+    }
+
+    @PostConstruct
+    public void initialize() {
+        jdbcTemplate.execute("CREATE TABLE IF NOT EXISTS student_project_study_time ("
+                + "student_user_id varchar(64) NOT NULL,"
+                + "teaching_class_id varchar(64) NOT NULL,"
+                + "project_name varchar(128) NOT NULL,"
+                + "study_seconds bigint NOT NULL DEFAULT 0,"
+                + "create_time datetime NOT NULL,"
+                + "update_time datetime NOT NULL,"
+                + "PRIMARY KEY (student_user_id, teaching_class_id, project_name)"
+                + ") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci");
+    }
+}

src/main/java/com/sztzjy/linkCommerce/controller/stu/StudentProjectStudyTimeController.java

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+package com.sztzjy.linkCommerce.controller.stu;
+
+import com.sztzjy.linkCommerce.config.security.JwtUser;
+import com.sztzjy.linkCommerce.config.security.TokenProvider;
+import com.sztzjy.linkCommerce.entity.dto.StudentProjectStudyTimeDTO;
+import com.sztzjy.linkCommerce.service.StudentTeachingClassResolver;
+import com.sztzjy.linkCommerce.util.ResultEntity;
+import org.apache.commons.lang3.StringUtils;
+import org.springframework.http.HttpStatus;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.servlet.http.HttpServletRequest;
+import java.sql.Timestamp;
+import java.util.Collections;
+import java.util.List;
+
+@RestController
+@RequestMapping("api/student/project-study-time")
+public class StudentProjectStudyTimeController {
+    private static final int MAX_SECONDS_PER_RECORD = 300;
+    private final JdbcTemplate jdbcTemplate;
+    private final StudentTeachingClassResolver studentTeachingClassResolver;
+
+    public StudentProjectStudyTimeController(JdbcTemplate jdbcTemplate,
+                                             StudentTeachingClassResolver studentTeachingClassResolver) {
+        this.jdbcTemplate = jdbcTemplate;
+        this.studentTeachingClassResolver = studentTeachingClassResolver;
+    }
+
+    @PostMapping("/record")
+    public ResultEntity<Void> record(@RequestParam String projectName,
+                                     @RequestParam Integer durationSeconds,
+                                     HttpServletRequest request) {
+        JwtUser user = TokenProvider.getJWTUser(request);
+        String normalizedProjectName = StringUtils.trimToEmpty(projectName);
+        if (normalizedProjectName.isEmpty() || durationSeconds == null || durationSeconds <= 0) {
+            return new ResultEntity<>(HttpStatus.BAD_REQUEST, "项目名称和学习时长必须有效");
+        }
+        int seconds = Math.min(durationSeconds, MAX_SECONDS_PER_RECORD);
+        String classId = studentTeachingClassResolver.resolveRequired(user);
+        Timestamp now = new Timestamp(System.currentTimeMillis());
+        jdbcTemplate.update("INSERT INTO student_project_study_time (student_user_id, teaching_class_id, project_name, study_seconds, create_time, update_time) "
+                        + "VALUES (?, ?, ?, ?, ?, ?) ON DUPLICATE KEY UPDATE study_seconds = study_seconds + VALUES(study_seconds), update_time = VALUES(update_time)",
+                user.getUserId(), classId, normalizedProjectName, seconds, now, now);
+        return new ResultEntity<>(HttpStatus.OK, "学习时长记录成功");
+    }
+
+    @GetMapping("/current")
+    public ResultEntity<List<StudentProjectStudyTimeDTO>> current(HttpServletRequest request) {
+        JwtUser user = TokenProvider.getJWTUser(request);
+        String classId = studentTeachingClassResolver.resolveRequired(user);
+        List<StudentProjectStudyTimeDTO> rows = jdbcTemplate.query(
+                "SELECT project_name, study_seconds FROM student_project_study_time WHERE student_user_id = ? AND teaching_class_id = ? ORDER BY project_name",
+                new Object[]{user.getUserId(), classId},
+                (resultSet, index) -> {
+                    StudentProjectStudyTimeDTO row = new StudentProjectStudyTimeDTO();
+                    row.setProjectName(resultSet.getString("project_name"));
+                    row.setStudySeconds(resultSet.getLong("study_seconds"));
+                    return row;
+                });
+        return new ResultEntity<>(HttpStatus.OK, "查询成功", rows == null ? Collections.emptyList() : rows);
+    }
+}

src/main/java/com/sztzjy/linkCommerce/entity/dto/StudentProjectStudyTimeDTO.java

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+package com.sztzjy.linkCommerce.entity.dto;
+
+public class StudentProjectStudyTimeDTO {
+    private String projectName;
+    private Long studySeconds;
+
+    public String getProjectName() {
+        return projectName;
+    }
+
+    public void setProjectName(String projectName) {
+        this.projectName = projectName;
+    }
+
+    public Long getStudySeconds() {
+        return studySeconds;
+    }
+
+    public void setStudySeconds(Long studySeconds) {
+        this.studySeconds = studySeconds;
+    }
+}

src/test/java/com/sztzjy/linkCommerce/config/StudentProjectStudyTimeSchemaInitializerTest.java

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+package com.sztzjy.linkCommerce.config;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.jdbc.core.JdbcTemplate;
+
+import static org.mockito.ArgumentMatchers.contains;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+class StudentProjectStudyTimeSchemaInitializerTest {
+    @Test
+    void createsPerStudentPerClassProjectDurationTable() {
+        JdbcTemplate jdbcTemplate = mock(JdbcTemplate.class);
+
+        new StudentProjectStudyTimeSchemaInitializer(jdbcTemplate).initialize();
+
+        verify(jdbcTemplate).execute(contains("student_project_study_time"));
+    }
+}