Question

我有JDBC表，其中包含大量记录，我想将所选查询中的结果集存储到多维数组中，并在jsp页面中显示为表。

Servlet页面：

ArrayList al = new ArrayList();
ArrayList list = new ArrayList();
try {
    DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver()); 
    con = DriverManager.getConnection("jdbc:oracle:thin:@ip/test","user","pass");
} catch (SQLException e) {
    out.println(e.getMessage());
}
try {
    OraclePreparedStatement stmt
                    = (OraclePreparedStatement) con.prepareStatement(
                            "Select * from MSG");
    ResultSet rs = stmt.executeQuery();
    while (rs.next()) {
    }

Answer 1

我没有测试过，但基本上是：

a）crate ArrayList<ArrayList<Object>>来存储结果。

b）获取列数rs.getMetaData().getColumnCount()

c）对于每个行包ArrayList<Object>，从行迭代colums并将其添加到其中。

d）将行添加到结果数组中。

基于您的代码，它可能是这样的：

ArrayList<ArrayList<Object>> resultTable = new ArrayList<ArrayList<Object>>();

     try {

DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver()); con = DriverManager.getConnection("jdbc:oracle:thin:@ip/test","user","pass");

    } catch (SQLException e) {

        out.println(e.getMessage());

    }
    try {
        OraclePreparedStatement stmt
                = (OraclePreparedStatement) con.prepareStatement(
                        "Select * from MSG");

          ResultSet rs = stmt.executeQuery(); 
          ResultSetMetaData rsmd = rs.getMetaData();
          int columnCount = rsmd.getColumnCount();

          while (rs.next()) {
           ArrayList<Object> row = new ArrayList<Object>();
           for (int col=1; col < columnCount) {
               row.add(rs.getObject(col));
           }
           resultTable.add(row);
          }
    } catch ...

    // here you have results rewriten to resultsTable

将2D数组中的结果集作为表格在jsp页面中显示此表格

1 个答案: