在prepare语句中传递数组参数 - 获取"java.sql.SQLFeatureNotSupportedException"

Question

我在我的prepare语句中遇到错误java.sql.SQLFeatureNotSupportedException.我正在使用Mysql数据库.

以下是我的代码.

class tmp {
public static void main(String arg[]) {

    try {
        Class.forName("com.mysql.jdbc.Driver");
        Connection conn = DriverManager.getConnection(
                "jdbc:mysql://localhost/sample", "root", "root");
        PreparedStatement pst = conn
                .prepareStatement("select * from userinfo where firstname in(?)");

        String[] Parameter = { "user1", "Administrator" };
        Array sqlArray = conn.createArrayOf("VARCHAR", Parameter);
        pst.setArray(1, sqlArray);
        ResultSet rs = pst.executeQuery();
        while (rs.next()) {
            System.out.println(rs.getInt(1));
        }
    } catch (Exception e) {
        e.printStackTrace();
        }
    }
}

Answer 1

对于Mysql-

在Mysql中无法设置数组.

而不是你可以在循环中形成(？,？,..)的查询以及设置值的相同方式.

String[] Parameter = { "user1", "Administrator" };
String query = "select * from userinfo where firstname in (";
String temp = "";

for(i = 0; i < Parameter.length; i++) {
  temp += ",?";
}

temp = temp.replaceFirst(",", "");
temp += ")";
query = query + temp;

PreparedStatement pst = conn.prepareStatement(query);

所以查询变成了

select * from userinfo where firstname in (?,?)

并使用循环传递值.

对于Oracle-

ArrayDescriptor arrayDescriptor = ArrayDescriptor.createDescriptor("CHAR_ARRAY", conn);
String[] Parameter = { "user1", "Administrator" };
java.sql.Array sqlArray = new oracle.sql.ARRAY(arrayDescriptor, conn, content);
.
.
pstmt.setArray(1, sqlArray);