Question

我遇到以下错误：

org.springframework.dao.DataIntegrityViolationException: PreparedStatementCallback; SQL [INSERT INTO user_role(username) VALUES(?);Column 'username' cannot be null; nested exception is java.sql.SQLIntegrityConstraintViolationException: Column 'username' cannot be null
    org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:87)
    org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
    org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81)
    org.springframework.jdbc.core.JdbcTemplate.translateException(JdbcTemplate.java:1402)
    org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:620)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:850)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:871)
    org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.update(NamedParameterJdbcTemplate.java:317)
    dao.UserDAOImpl.setPrivigiles(UserDAOImpl.java:42)
    dao.UserDAOImpl.create(UserDAOImpl.java:34)
    dao.UserDAOImpl.create(UserDAOImpl.java:1)
    service.UserService.addUser(UserService.java:16)
    controller.RegisterController.doPost(RegisterController.java:33)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)


Root Cause
java.sql.SQLIntegrityConstraintViolationException: Column 'username' cannot be null
    com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:117)
    com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
    com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
    com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:975)
    com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1114)
    com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1062)
    com.mysql.cj.jdbc.ClientPreparedStatement.executeLargeUpdate(ClientPreparedStatement.java:1383)
    com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdate(ClientPreparedStatement.java:1047)
    org.apache.tomcat.dbcp.dbcp2.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:87)
    org.apache.tomcat.dbcp.dbcp2.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:87)
    org.springframework.jdbc.core.JdbcTemplate.lambda$update$0(JdbcTemplate.java:855)
    org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:605)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:850)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:871)
    org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.update(NamedParameterJdbcTemplate.java:317)
    dao.UserDAOImpl.setPrivigiles(UserDAOImpl.java:42)
    dao.UserDAOImpl.create(UserDAOImpl.java:34)
    dao.UserDAOImpl.create(UserDAOImpl.java:1)
    service.UserService.addUser(UserService.java:16)
    controller.RegisterController.doPost(RegisterController.java:33)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

UserDAOImpl类代码下面：

package dao;

import java.util.List;

import org.springframework.jdbc.core.namedparam.BeanPropertySqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;
import org.springframework.jdbc.support.GeneratedKeyHolder;
import org.springframework.jdbc.support.KeyHolder;

import model.User;
import util.ConnectionProvider;

public class UserDAOImpl implements UserDAO {

    private static final String CREATE_USER =
            "INSERT INTO user(username,email,password,is_active) VALUES(:username,:email,:password,:active);";

    private NamedParameterJdbcTemplate template;

    public UserDAOImpl() {
        template = new NamedParameterJdbcTemplate(ConnectionProvider.getDataSource());
    }

    @Override
    public User create(User user) {
        User resultUser = new User(user);
        KeyHolder holder = new GeneratedKeyHolder();
        SqlParameterSource paramSource = new BeanPropertySqlParameterSource(user);
        int update = template.update(CREATE_USER, paramSource, holder);
        if (update > 0) {
            resultUser.setId((holder.getKey()).longValue());
            setPrivigiles(resultUser);
        }
        return resultUser;
    }

    private void setPrivigiles(User user) {
        final String userRoleQuery = "INSERT INTO user_role(username) VALUES(:username);";
        SqlParameterSource paramSource = new BeanPropertySqlParameterSource(user);
        template.update(userRoleQuery, paramSource);
    }
}

我创建了两个表：user和user_role，它们通过username参数作为外键绑定。我将添加更多的用户添加到数据库中，当我要将参数传递给第二个表：user_role时，错误弹出。此表中没有新内容。有人可以帮我解决此异常吗？

org.springframework.dao.DataIntegrityViolationException：PreparedStatementCallback

0 个答案: