标签：自己 serve col += throws ati sum figure arraylist
通过JDBC 操作数据库 有三种方式 第一种 是 使用 JDBC的JDBC Template ，一种是NamedParameterJdbcTemplate ，一种是 使用 Simple JDBC Insert。
具体的例子 可以 参考下面的 几种 示例。 因为我的 类 是 使用 的 Map 进行传参，而且又不想 使用 占位符 ， 所以变使用了 Simple JDBC Insert
A JDBC batch update is multiple updates using the same database session. That is, we don‘t have to open connections multiple times.
In our previous example, let‘s say we want to insert multiple Person objects in the database. Followings are the various ways to do that in Spring.
batchUpdate(String... sql) : jdbcTemplate.batchUpdate(
"insert into PERSON (FIRST_NAME, LAST_NAME, ADDRESS) values (‘Dana‘, ‘Whitley‘, ‘464 Gorsuch Drive‘)",
"insert into PERSON (FIRST_NAME, LAST_NAME, ADDRESS) values (‘Robin‘, ‘Cash‘, ‘64 Zella Park‘)"
);
batchUpdate(String sql, List<Object[]> batchArgs) : jdbcTemplate.batchUpdate(
"insert into PERSON (FIRST_NAME, LAST_NAME, ADDRESS) values (?, ?, ?)",
Arrays.asList(new Object[]{"Dana", "Whitley", "464 Gorsuch Drive"},
new Object[]{"Robin", "Cash", "64 Zella Park"})
);
batchUpdate(String sql, List <Object[]> batchArgs, int[] argTypes) : jdbcTemplate.batchUpdate(
"insert into PERSON (FIRST_NAME, LAST_NAME, ADDRESS) values (?, ?, ?)",
Arrays.asList(new Object[]{"Dana", "Whitley", "464 Gorsuch Drive"},
new Object[]{"Robin", "Cash", "64 Zella Park"}),
new int[]{Types.VARCHAR, Types.VARCHAR, Types.VARCHAR}
);
batchUpdate(String sql, BatchPreparedStatementSetter pss) final List<Person> persons = Arrays.asList(
Person.create("Dana", "Whitley", "464 Gorsuch Drive"),
Person.create("Robin", "Cash", "64 Zella Park")
);
String sql = "insert into Person (first_Name, Last_Name, Address) values (?, ?, ?)";
int[] updateCounts = jdbcTemplate.batchUpdate(sql, new BatchPreparedStatementSetter() {
@Override
public void setValues(PreparedStatement ps, int i) throws SQLException {
ps.setString(1, persons.get(i).getFirstName());
ps.setString(2, persons.get(i).getLastName());
ps.setString(3, persons.get(i).getAddress());
}
@Override
public int getBatchSize() {
return persons.size();
}
});
batchUpdate(String sql, Collection<T> batchArgs, int batchSize, ParameterizedPreparedStatementSetter <T> pss). This method can break the batch updates into serveral smaller batches specified by batchSize. final List<Person> persons = Arrays.asList(
Person.create("Dana", "Whitley", "464 Gorsuch Drive"),
Person.create("Robin", "Cash", "64 Zella Park")
);
String sql = "insert into Person (first_Name, Last_Name, Address) values (?, ?, ?)";
int[][] updateCounts = jdbcTemplate.batchUpdate(sql, persons, persons.size(),
new ParameterizedPreparedStatementSetter<Person>() {
@Override
public void setValues(PreparedStatement ps, Person person) throws SQLException {
ps.setString(1, person.getFirstName());
ps.setString(2, person.getLastName());
ps.setString(3, person.getAddress());
}
});
batchUpdate(String sql, Map <String,?>[] batchValues) List<Person> persons = Arrays.asList(
Person.create("Dana", "Whitley", "464 Gorsuch Drive"),
Person.create("Robin", "Cash", "64 Zella Park")
);
String sql = "insert into Person (first_Name, Last_Name, Address) " +
"values (:firstName, :lastName, :address)";
List<Map<String, Object>> batchValues = new ArrayList<>(persons.size());
for (Person person : persons) {
batchValues.add(
new MapSqlParameterSource("firstName", person.getFirstName())
.addValue("lastName", person.getLastName())
.addValue("address", person.getAddress())
.getValues());
}
int[] updateCounts = namedParamJdbcTemplate.batchUpdate(sql,
batchValues.toArray(new Map[persons.size()]));
batchUpdate(String sql, SqlParameterSource[] batchArgs) List<Person> persons = Arrays.asList(
Person.create("Dana", "Whitley", "464 Gorsuch Drive"),
Person.create("Robin", "Cash", "64 Zella Park")
);
String sql = "insert into Person (first_Name, Last_Name, Address) " +
"values (:firstName, :lastName, :address)";
SqlParameterSource[] batch = SqlParameterSourceUtils.createBatch(persons.toArray());
int[] updateCounts = namedParamJdbcTemplate.batchUpdate(sql, batch);
executeBatch(Map<String,?>... batch) 对大小写 不敏感 ， 只要 Columns 中有 数值 就可以 List<Map<String, Object>> batchValues = new ArrayList<>(persons.size());
for (Person person : persons) {
Map<String, Object> map = new HashMap<>();
map.put("first_Name", person.getFirstName());
map.put("last_Name", person.getLastName());
map.put("address", person.getAddress());
batchValues.add(map);
}
SimpleJdbcInsert simpleJdbcInsert = new SimpleJdbcInsert(dataSource).withTableName("PERSON");
int[] ints = simpleJdbcInsert.executeBatch(batchValues.toArray(new Map[persons.size()]));
public int[] executeBatch(SqlParameterSource... batch). We don‘t have to specify any column to bean field name mapping. It can figure out the differences like underscores in the table column names. For example bean#firstName is automatically mapped to column FIRST_NAME. List<Person> persons = Arrays.asList(
Person.create("Dana", "Whitley", "464 Gorsuch Drive"),
Person.create("Robin", "Cash", "64 Zella Park")
);
SimpleJdbcInsert simpleJdbcInsert = new SimpleJdbcInsert(dataSource)
.withTableName("PERSON")
.usingGeneratedKeyColumns("id");
SqlParameterSource[] batch = SqlParameterSourceUtils.createBatch(persons.toArray());
int[] ints = simpleJdbcInsert.executeBatch(batch);
在这里 我就碰到了 这个坑 如果是 传统的 list.toArray() , 那么 其实 转换出来的 是一个 Object 数组， 这样子使用的 方式 是 Bean 命名 的方式。
for ( int i = 0 ; i < list.size() ; i +=batchSize ) {
final List<Map<String, Object>> batchList = list.subList(i, i + batchSize > list.size() ? list.size() : i + batchSize);
batchList.stream().forEach(putMapValue(batchId, site));
Map[] maps = batchList.stream().toArray(Map[]::new);
SqlParameterSource[] batch = SqlParameterSourceUtils.createBatch(maps);
jdbcInsert.executeBatch(batch);
}
private Consumer<Map<String, Object>> putMapValue(String batchId, String site) {
return map -> {
map.put("UUID", UUID.randomUUID().toString());
map.put("LAST_BATCH_ID",batchId);
map.put("SITE", site);
};
}
for ( int i = 0 ; i < list.size() ; i +=batchSize ) {
final List<Map<String, Object>> batchList = list.subList(i, i + batchSize > list.size() ? list.size() : i + batchSize);
batchList.stream().forEach(putMapValue(batchId, site));
Map[] maps = batchList.stream().toArray(Map[]::new);
SqlParameterSource[] batch = SqlParameterSourceUtils.createBatch(maps);
jdbcInsert.executeBatch(batch);
}
标签：自己 serve col += throws ati sum figure arraylist
原文地址：https://www.cnblogs.com/mythdoraemon/p/10526360.html
