7

我正在尝试批量插入一组 bean。bean 的属性之一是 ArrayList。批量更新失败，但有以下异常：

 Can't infer the SQL type to use for an instance of java.util.ArrayList. Use setObject() with an explicit Types value to specify the type to use.

我不知道要使用哪种 Postgresql 数据类型来使 ArrayList 兼容。有没有一种方法可以在不更改其属性的数据类型的情况下对 bean 进行批量更新？

豆子：

    import java.util.List;

    public class SomeBean {
        private int id;
        private List<String> names;

        @Override
        public String toString() {
            return "SomeBean [id=" + id + ", names=" + names + "]";
        }
        //Setters and getters

表架构：

CREATE TABLE arraylistexample
(
  id serial NOT NULL,
  names character varying[]
)

插入数据的方法：

    public void insert(List<SomeBean> beans){
        String sql = "INSERT INTO ARRAYLISTEXAMPLE (NAMES) VALUES (:names)";

        SqlParameterSource[] data = SqlParameterSourceUtils.createBatch(beans.toArray());
        pgTemplate.batchUpdate(sql, data);
    }

例外：

Exception in thread "main" org.springframework.jdbc.BadSqlGrammarException: PreparedStatementCallback; bad SQL grammar [INSERT INTO ARRAYLISTEXAMPLE (NAMES) VALUES (?, ?)]; nested exception is org.postgresql.util.PSQLException: Can't infer the SQL type to use for an instance of java.util.ArrayList. Use setObject() with an explicit Types value to specify the type to use.
    at org.springframework.jdbc.support.SQLStateSQLExceptionTranslator.doTranslate(SQLStateSQLExceptionTranslator.java:98)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:603)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:615)
    at org.springframework.jdbc.core.JdbcTemplate.batchUpdate(JdbcTemplate.java:884)
    at org.springframework.jdbc.core.namedparam.NamedParameterBatchUpdateUtils.executeBatchUpdateWithNamedParameters(NamedParameterBatchUpdateUtils.java:40)
    at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.batchUpdate(NamedParameterJdbcTemplate.java:303)
    at some.package.dao.GenericDao.insert(GenericDao.java:45)
    at some.package.runner.FileLogicTester.storingArrayListInDb(FileLogicTester.java:220)
    at some.package.runner.FileLogicTester.main(FileLogicTester.java:86)
Caused by: org.postgresql.util.PSQLException: Can't infer the SQL type to use for an instance of java.util.ArrayList. Use setObject() with an explicit Types value to specify the type to use.
    at org.postgresql.jdbc2.AbstractJdbc2Statement.setObject(AbstractJdbc2Statement.java:1801)
    at org.postgresql.jdbc3g.AbstractJdbc3gStatement.setObject(AbstractJdbc3gStatement.java:37)
    at org.postgresql.jdbc4.AbstractJdbc4Statement.setObject(AbstractJdbc4Statement.java:46)
    at org.apache.commons.dbcp.DelegatingPreparedStatement.setObject(DelegatingPreparedStatement.java:255)
    at org.springframework.jdbc.core.StatementCreatorUtils.setValue(StatementCreatorUtils.java:351)
    at org.springframework.jdbc.core.StatementCreatorUtils.setParameterValueInternal(StatementCreatorUtils.java:216)
    at org.springframework.jdbc.core.StatementCreatorUtils.setParameterValue(StatementCreatorUtils.java:144)
    at org.springframework.jdbc.core.BatchUpdateUtils.setStatementParameters(BatchUpdateUtils.java:63)
    at org.springframework.jdbc.core.namedparam.NamedParameterBatchUpdateUtils.access$000(NamedParameterBatchUpdateUtils.java:32)
    at org.springframework.jdbc.core.namedparam.NamedParameterBatchUpdateUtils$1.setValues(NamedParameterBatchUpdateUtils.java:47)
    at org.springframework.jdbc.core.JdbcTemplate$4.doInPreparedStatement(JdbcTemplate.java:893)
    at org.springframework.jdbc.core.JdbcTemplate$4.doInPreparedStatement(JdbcTemplate.java:884)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:587)
    ... 7 more

有什么建议么？

4

4 回答 4

2

我面临着同样的问题。 人们在这里讨论过这个问题。看起来这是 JDBC 驱动程序或 PostgeSQL 本身的错误，因此您不能只将数组传递给数据库。作为一种解决方法，我必须手动创建 SQL（我有整数值，所以不关心 sql 注入；您可能希望先动态准备SELECT * FROM MYTABLE WHERE ID IN (?,?,?)然后处理语句）。

private static final String SQL_FIND_GOAL = "SELECT * FROM MYTABLE WHERE ID IN (:ids)";

public List<MyGoal> getAllMyGoals(Set<Integer> ids) {
// Work around of issue.
int i=0;
String mockInStatement = "";
for (int type: ids){
  if (i < ids.size()-1){
    mockInStatement = mockInStatement + type + ",";
  }
  else {
    mockInStatement = mockInStatement + type;
  }
  i++;
}
String refinedSQL = SQL_FIND_GOAL.replace(":ids",mockInStatement);

List<MyGoal> result = jdbcTemplate.query(
    refinedSQL, 
    new RowMapper<MyGoal>() {
      @Override
      public MyGoal mapRow(ResultSet rs, int rowNum) throws SQLException {
        MyGoal myGoal = new MyGoal();
        myGoal.setCode(rowNum);
        myGoal.setName(rs.getString("name"));
        return myGoal;
      }
    });
return result;  }
于 2015-06-07T08:57:41.680 回答
1

将其转换为类型化的 Java 数组，它应该可以工作：

String insertSql = "INSERT INTO my_table(my_array) VALUES(?)";
jdbcTemplate.update(insertSql,myArrayList.toArray(new String[myArrayList.size()]));
于 2020-12-01T16:21:34.767 回答
0

我认为 PGSQL 的数据类型不正确，请参阅 此

character varying(n) varchar(n) 变长字符串

您可能正在寻找的是 PGSQL 数组

于 2014-07-06T19:18:43.660 回答
0

jdbcTemplate.update不是 OP 的问题，但我在不小心使用而不是时遇到了这个错误jdbcTemplate.batchUpdate

于 2019-03-11T15:00:24.377 回答