java可以通過DatabaseMetaData確定資料庫中是否存在表和表中是否有列。

參考:

package com.zuidaima;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;

public class CheckTableAndColumnExist {

	public static void main(String[] args) {
		Connection connection = null;
		try {
			String userName = "root";
			String password = "111111";
			String jdbcurl = "jdbc:mysql://localhost:3306/zuidaima?useUnicode=true&characterEncoding=utf-8";
			Class.forName("com.mysql.jdbc.Driver").newInstance();
			connection = DriverManager.getConnection(jdbcurl, userName,
					password);
			DatabaseMetaData md = connection.getMetaData();
			String tableName = "staff";
			String columnName = "column_name";
			ResultSet rs = md.getTables(null, null, tableName, null);
			if (rs.next()) {
				System.out.println("Table " + tableName + " exist");
				rs = md.getColumns(null, null, tableName, columnName);
				if (rs.next()) {
					System.out.println("Table " + tableName
							+ " exist in Table " + tableName);
				} else {
					System.out.println("Column " + tableName
							+ " not exist in Table " + tableName);
				}
			} else {
				System.out.println("Table " + tableName + " not exist");
			}
		} catch (Exception e) {
			System.err.println("Cannot connect to database server,Exception:"
					+ e.getMessage());
		} finally {
			if (connection != null) {
				try {
					connection.close();
					connection = null;
				} catch (Exception e) { /* ignore close errors */
				}
			}
		}
	}
}