在 JDBC 中将数组传递给 postgres

Question

我想在 Postgres 中使用 JDBC 执行以下查询：

with things as (values(1),(2)) select * from things;

所以我的 Java 代码如下所示：

String sql = "with things as (?) select * from things";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setArray(1, conn.createArrayOf("INTEGER", new Integer[]{1, 2});

但这会抛出以下错误：

org.postgresql.util.PSQLException: ERROR: syntax error at or near ""

Answer 1

您可以像这样使用 unnest 做您需要的事情：

Integer[] id = {1, 2};
Array array = connection.createArrayOf("int4", id);

try (PreparedStatement stmt = connection.prepareStatement(
         "with things as (select unnest((?)::integer[])) select * from things")) {
    stmt.setArray(1, array);
    ResultSet rs = stmt.executeQuery();
    // use the result set
}

在 JDBC 中将数组传递给 postgres

pass array to postgres in JDBC

postgresql

jdbc

common-table-expression