jdbc链接数据库,获取表名，字段名和数据

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;

//jdbc链接数据库,获取表名，字段名和数据
public class TestMysql {

	public static void main(String[] args) throws Exception {

		String driver = "com.mysql.jdbc.Driver";
		String url = "jdbc:mysql://127.0.0.1:3306/mysql?useUnicode=true&characterEncoding=UTF-8&createDatabaseIfNotExist=true";
		String user = "root";
		String password = "mysql0774mysql";

		Class.forName(driver);
		Connection conn = DriverManager.getConnection(url, user, password);
		if (!conn.isClosed())
			System.out.println("Succeeded connecting to the Database!");
		else
			System.err.println("connect filed");
		// 获取所有表名
		Statement statement = conn.createStatement();

		getTables(conn);

		ResultSet resultSet = statement
				.executeQuery("select * from help_keyword");
		// 获取列名
		ResultSetMetaData metaData = resultSet.getMetaData();
		for (int i = 0; i < metaData.getColumnCount(); i++) {
			// resultSet数据下标从1开始
			String columnName = metaData.getColumnName(i + 1);
			int type = metaData.getColumnType(i + 1);
			if (Types.INTEGER == type) {
				// int
			} else if (Types.VARCHAR == type) {
				// String
			}
			System.out.print(columnName + "\t");
		}
		System.out.println();
		// 获取数据
		while (resultSet.next()) {
			for (int i = 0; i < metaData.getColumnCount(); i++) {
				// resultSet数据下标从1开始
				System.out.print(resultSet.getString(i + 1) + "\t");
			}
			System.out.println();

		}
		statement.close();
		conn.close();

	}

	public static String convertDatabaseCharsetType(String in, String type) {
		String dbUser;
		if (in != null) {
			if (type.equals("oracle")) {
				dbUser = in.toUpperCase();
			} else if (type.equals("postgresql")) {
				dbUser = "public";
			} else if (type.equals("mysql")) {
				dbUser = null;
			} else if (type.equals("mssqlserver")) {
				dbUser = null;
			} else if (type.equals("db2")) {
				dbUser = in.toUpperCase();
			} else {
				dbUser = in;
			}
		} else {
			dbUser = "public";
		}
		return dbUser;
	}

	private static void getTables(Connection conn) throws SQLException {
		DatabaseMetaData dbMetData = conn.getMetaData();
		// mysql convertDatabaseCharsetType null
		ResultSet rs = dbMetData.getTables(null,
				convertDatabaseCharsetType("root", "mysql"), null,
				new String[] { "TABLE", "VIEW" });

		while (rs.next()) {
			if (rs.getString(4) != null
					&& (rs.getString(4).equalsIgnoreCase("TABLE") || rs
							.getString(4).equalsIgnoreCase("VIEW"))) {
				String tableName = rs.getString(3).toLowerCase();
				System.out.print(tableName + "\t");
				// 根据表名提前表里面信息：
				ResultSet colRet = dbMetData.getColumns(null, "%", tableName,
						"%");
				while (colRet.next()) {
					String columnName = colRet.getString("COLUMN_NAME");
					String columnType = colRet.getString("TYPE_NAME");
					int datasize = colRet.getInt("COLUMN_SIZE");
					int digits = colRet.getInt("DECIMAL_DIGITS");
					int nullable = colRet.getInt("NULLABLE");
					// System.out.println(columnName + " " + columnType + " "+
					// datasize + " " + digits + " " + nullable);
				}

			}
		}
		System.out.println();

		// resultSet数据下标从1开始 ResultSet tableRet =
		//conn.getMetaData().getTables(null, null, "%", new String[] { "TABLE" });
		//while (tableRet.next()) {
		//	System.out.print(tableRet.getString(3) + "\t");
		//}
		//System.out.println();

	}

}