我正在编写简单的 Java 代码,并且必须在 Postgresql 数据库上执行 SQL 查询。 该数据库的结果(我手动检查过)是一个由一列和两个整数组成的简单表格,如下所示:
我的问题是我找不到任何方法来读取这两行。 我的阅读代码是:
_conn.setReadOnly(false);
_stmt = _conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
_stmt.setFetchSize(100);
List< Short > lista = new List< Short >();
_rs = _stmt.executeQuery(query);
while (_rs.next()) {
lista.add((short)_rs.getInt(1));
}
这段代码只读取第一行,但没有办法让它读取第二行。 短列表“lista”始终包含 1 个元素。 就像 ResultSet 没有继续读取第二行一样...
如何读取这两行?
编辑:我尝试过使用 ArrayList 但它不起作用。我添加了 _conn 连接和 _stmt 语句的代码部分。 这是查询:
SELECT COUNT(bffK.biological_function_feature_oid)
FROM biological_function_feature AS bff
INNER JOIN biological_function_feature_unfolded AS bffu
ON bff.biological_function_feature_oid = bffu.term_oid
INNER JOIN ( SELECT DISTINCT ON (g.gene_oid, bffu.ancestor_oid) g.gene_oid AS ance_gene, bffu.ancestor_oid AS ance_oid, mf.feature_name AS feature_name, mf.feature_id AS feature_id, ef.name AS evidence, qf.name AS qualifier
FROM gene2biological_function_feature AS g2bff
INNER JOIN biological_function_feature AS bff
ON g2bff.biological_function_feature_oid = bff.biological_function_feature_oid
INNER JOIN biological_function_feature_unfolded AS bffu
ON bffu.term_oid = bff.biological_function_feature_oid
INNER JOIN metadata.feature AS mf ON bff.feature_type = mf.feature_id
INNER JOIN gene AS g ON g2bff.gene_oid = g.gene_oid
LEFT JOIN flag.evidence_flags AS ef ON g2bff.evidence = ef.id
LEFT JOIN flag.qualifier_flags AS qf ON g2bff.qualifier = qf.id
LEFT JOIN flag.inferred_flags AS fif ON fif.id = g2bff.inferred
WHERE g.gene_oid=(4060969)
AND (bff.is_obsolete NOT IN ('t') OR bff.is_obsolete IS NULL)
AND (g.is_obsolete NOT IN ('t') OR g.is_obsolete IS NULL)
AND distance=1
UNION
SELECT DISTINCT ON (g.gene_oid, bff.biological_function_feature_oid)
g.gene_oid AS ance_gene, bff.biological_function_feature_oid AS ance_oid,
mf.feature_name AS feature_name, mf.feature_id AS feature_id,
ef.name AS evidence,
qf.name AS qualifier
FROM gene2biological_function_feature AS g2bff
INNER JOIN biological_function_feature AS bff
ON g2bff.biological_function_feature_oid = bff.biological_function_feature_oid
INNER JOIN metadata.feature AS mf ON bff.feature_type = mf.feature_id
INNER JOIN gene AS g ON g2bff.gene_oid = g.gene_oid
LEFT JOIN flag.evidence_flags AS ef ON g2bff.evidence = ef.id
LEFT JOIN flag.qualifier_flags AS qf ON g2bff.qualifier = qf.id
LEFT JOIN flag.inferred_flags AS fif ON fif.id = g2bff.inferred
WHERE g.gene_oid=(4060969)
AND (bff.is_obsolete NOT IN ('t') OR bff.is_obsolete IS NULL)
AND (g.is_obsolete NOT IN ('t') OR g.is_obsolete IS NULL)
AND ef.name NOT IN ('IEA', 'ND')
)
AS unf ON unf.ance_oid = bffu.ancestor_oid
INNER JOIN gene AS gK on gk.Gene_oid=ance_gene
INNER JOIN biological_function_feature AS bffK
ON bffK.biological_function_feature_oid = bffu.ancestor_oid
LEFT JOIN flag.evidence_flags AS efK
ON evidence = efK.name
LEFT JOIN flag.qualifier_flags AS qfK
ON qualifier = qfK.name
WHERE bffu.distance=1 AND (bff.biological_function_feature_oid) IN (217538)
AND evidence NOT IN ('IEA', 'ND')
UNION
SELECT COUNT(bffK.biological_function_feature_oid)
FROM biological_function_feature AS bff
INNER JOIN biological_function_feature_unfolded AS bffu
ON bff.biological_function_feature_oid = bffu.term_oid
INNER JOIN ( SELECT DISTINCT ON (g.gene_oid, bffu.ancestor_oid) g.gene_oid AS ance_gene, bffu.ancestor_oid AS ance_oid, mf.feature_name AS feature_name, mf.feature_id AS feature_id, ef.name AS evidence, qf.name AS qualifier
FROM gene2biological_function_feature AS g2bff
INNER JOIN biological_function_feature AS bff
ON g2bff.biological_function_feature_oid = bff.biological_function_feature_oid
INNER JOIN biological_function_feature_unfolded AS bffu
ON bffu.term_oid = bff.biological_function_feature_oid
INNER JOIN metadata.feature AS mf ON bff.feature_type = mf.feature_id
INNER JOIN gene AS g ON g2bff.gene_oid = g.gene_oid
LEFT JOIN flag.evidence_flags AS ef ON g2bff.evidence = ef.id
LEFT JOIN flag.qualifier_flags AS qf ON g2bff.qualifier = qf.id
LEFT JOIN flag.inferred_flags AS fif ON fif.id = g2bff.inferred
WHERE g.gene_oid=(4060969)
AND (bff.is_obsolete NOT IN ('t') OR bff.is_obsolete IS NULL)
AND (g.is_obsolete NOT IN ('t') OR g.is_obsolete IS NULL)
AND distance=1
UNION
SELECT DISTINCT ON (g.gene_oid, bff.biological_function_feature_oid)
g.gene_oid AS ance_gene, bff.biological_function_feature_oid AS ance_oid,
mf.feature_name AS feature_name, mf.feature_id AS feature_id,
ef.name AS evidence,
qf.name AS qualifier
FROM gene2biological_function_feature AS g2bff
INNER JOIN biological_function_feature AS bff
ON g2bff.biological_function_feature_oid = bff.biological_function_feature_oid
INNER JOIN metadata.feature AS mf ON bff.feature_type = mf.feature_id
INNER JOIN gene AS g ON g2bff.gene_oid = g.gene_oid
LEFT JOIN flag.evidence_flags AS ef ON g2bff.evidence = ef.id
LEFT JOIN flag.qualifier_flags AS qf ON g2bff.qualifier = qf.id
LEFT JOIN flag.inferred_flags AS fif ON fif.id = g2bff.inferred
WHERE g.gene_oid=(4060969)
AND (bff.is_obsolete NOT IN ('t') OR bff.is_obsolete IS NULL)
AND (g.is_obsolete NOT IN ('t') OR g.is_obsolete IS NULL)
AND ef.name IN ('IEA', 'ND')
)
AS unf ON unf.ance_oid = bffu.ancestor_oid
INNER JOIN gene AS gK on gk.Gene_oid=ance_gene
INNER JOIN biological_function_feature AS bffK
ON bffK.biological_function_feature_oid = bffu.ancestor_oid
LEFT JOIN flag.evidence_flags AS efK
ON evidence = efK.name
LEFT JOIN flag.qualifier_flags AS qfK
ON qualifier = qfK.name
WHERE bffu.distance=1 AND (bff.biological_function_feature_oid) IN (217538)
AND evidence IN ('IEA', 'ND')
最佳答案
List是一个接口(interface),尝试使用ArrayList之类的东西
List< Short > lista = new ArrayList< Short >();
_rs = _stmt.executeQuery(query);
while (_rs.next()) {
lista.add((short)_rs.getShort(1));
}
关于Java SQL 查询执行,读取 ResultSet 行时出现问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20111667/