52 lines
2.5 KiB
Java
52 lines
2.5 KiB
Java
import java.sql.*;
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/** 一次性探针：复现 COUNT_BIG 报错。用完即删。 */
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public class Probe4 {
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public static void main(String[] args) throws Exception {
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String url = "jdbc:sqlserver://118.89.70.199:1433;databaseName=FMS;encrypt=true;trustServerCertificate=true";
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try (Connection conn = DriverManager.getConnection(url, "sa", "zhang520..")) {
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try (Statement st = conn.createStatement();
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ResultSet rs = st.executeQuery("SELECT COUNT_BIG(1) FROM [b_con_type]")) {
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rs.next();
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System.out.println("Statement 无别名: " + rs.getLong(1));
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} catch (SQLException e) {
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System.out.println("Statement 无别名 失败: " + e.getMessage());
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}
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try (Statement st = conn.createStatement();
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ResultSet rs = st.executeQuery("SELECT COUNT_BIG(1) AS total FROM [b_con_type]")) {
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rs.next();
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System.out.println("Statement 有别名: " + rs.getLong(1) + " / getLong(\"total\")=" + rs.getLong("total"));
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} catch (SQLException e) {
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System.out.println("Statement 有别名 失败: " + e.getMessage());
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}
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try (PreparedStatement ps = conn.prepareStatement("SELECT COUNT_BIG(1) FROM [b_con_type]");
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ResultSet rs = ps.executeQuery()) {
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rs.next();
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System.out.println("PreparedStatement 无别名 getLong(1): " + rs.getLong(1));
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} catch (SQLException e) {
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System.out.println("PreparedStatement 无别名 失败: " + e.getMessage());
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}
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try (PreparedStatement ps = conn.prepareStatement("SELECT COUNT_BIG(1) AS total FROM [b_con_type]");
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ResultSet rs = ps.executeQuery()) {
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rs.next();
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System.out.println("PreparedStatement 有别名 getLong(1): " + rs.getLong(1));
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} catch (SQLException e) {
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System.out.println("PreparedStatement 有别名 失败: " + e.getMessage());
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}
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System.out.println("列类型: " + columnType(conn, "SELECT COUNT_BIG(1) FROM [b_con_type]"));
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}
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}
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private static String columnType(Connection conn, String sql) throws SQLException {
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try (PreparedStatement ps = conn.prepareStatement(sql); ResultSet rs = ps.executeQuery()) {
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ResultSetMetaData md = rs.getMetaData();
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return md.getColumnLabel(1) + " / " + md.getColumnTypeName(1) + " / type=" + md.getColumnType(1);
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}
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}
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}
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