import java.io.FileInputStream;
import java.sql.*;
import java.util.Properties;

public class DbState {
    public static void main(String[] args) throws Exception {
        Properties props = new Properties();
        try (FileInputStream in = new FileInputStream(args[0])) { props.load(in); }
        try (Connection conn = DriverManager.getConnection(props.getProperty("url"), props.getProperty("username"), props.getProperty("password"))) {
            try (Statement st = conn.createStatement(); ResultSet rs = st.executeQuery("SELECT COUNT(*) FROM sys.foreign_keys")) {
                rs.next(); System.out.println("physical_fk_count=" + rs.getInt(1));
            }
            try (Statement st = conn.createStatement(); ResultSet rs = st.executeQuery("SELECT COUNT(*) FROM sys.tables")) {
                rs.next(); System.out.println("table_count=" + rs.getInt(1));
            }
            // 元数据表 b_id 是否仍是 identity
            try (Statement st = conn.createStatement();
                 ResultSet rs = st.executeQuery(
                     "SELECT OBJECT_NAME(ic.object_id) AS tbl, ic.name AS col, ic.seed_value, ic.increment_value " +
                     "FROM sys.identity_columns ic " +
                     "WHERE ic.name = 'b_id' ORDER BY tbl")) {
                System.out.println("identity_b_id_columns (sample):");
                int n = 0;
                while (rs.next() && n < 25) { n++; System.out.printf("  %-22s b_id identity(%s,%s)%n", rs.getString("tbl"), rs.getString("seed_value"), rs.getString("increment_value")); }
                System.out.println("  ... total shown=" + n);
            }
            // 最近 30 天内是否新建/修改过表
            try (Statement st = conn.createStatement();
                 ResultSet rs = st.executeQuery(
                     "SELECT COUNT(*) FROM sys.tables t JOIN sys.objects o ON o.object_id = t.object_id " +
                     "WHERE o.modify_date > DATEADD(day, -30, GETUTCDATE())")) {
                rs.next(); System.out.println("tables_modified_last_30d=" + rs.getInt(1));
            }
        }
    }
}