jdbc

最新推荐文章于 2025-12-24 21:55:42 发布

原创最新推荐文章于 2025-12-24 21:55:42 发布 · 97 阅读

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#jdbc #数据库

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package com.bjsxt;

import java.sql.*;

public class TestJDBC {

	public static void main(String[] args) {
		ResultSet rs = null;
		Statement stmt = null;
		Connection conn = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection("jdbc:mysql://localhost/test?user=root&password=root");
			stmt = conn.createStatement();
			rs = stmt.executeQuery("select * from user");
			while(rs.next()) {
				System.out.println("id: " + rs.getInt("id"));
				System.out.println("name: " + rs.getString("name"));
			}
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if(rs != null) {
					rs.close();
					rs = null;
				}
				if(stmt != null) {
					stmt.close();
					stmt = null;
				}
				if(conn != null) {
					conn.close();
					conn = null;
				}
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}

}


package com.bjsxt;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class TestDML2 {

	public static void main(String[] args) {
		if(args.length != 2) {
			System.out.println("Parameter Error! Please Input Again!");
			System.exit(-1);
		}

		int id = 0;

		try {
			id = Integer.parseInt(args[0]);
		} catch (NumberFormatException e) {
			System.out.println("Parameter Error! Deptno should be Number Format!");
			System.exit(-1);
		}

		String name = args[1];

		Statement stmt = null;
		Connection conn = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection("jdbc:mysql://localhost/test?user=root&password=root");
			stmt = conn.createStatement();
			String sql = "insert into user values (" + id + ",'" + name + "')";
			System.out.println(sql);
			stmt.executeUpdate(sql);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if(stmt != null) {
					stmt.close();
					stmt = null;
				}
				if(conn != null) {
					conn.close();
					conn = null;
				}
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}

}


package com.bjsxt;

import java.sql.*;

public class TestPrepStmt {

	public static void main(String[] args) {
		if(args.length != 2) {
			System.out.println("Parameter Error! Please Input Again!");
			System.exit(-1);
		}

		int id = 0;

		try {
			id = Integer.parseInt(args[0]);
		} catch (NumberFormatException e) {
			System.out.println("Parameter Error! Deptno should be Number Format!");
			System.exit(-1);
		}

		String name = args[1];

		PreparedStatement pstmt = null;
		Connection conn = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection("jdbc:mysql://localhost/test?user=root&password=root");
			pstmt = conn.prepareStatement("insert into user values (?, ?)");
			pstmt.setInt(1, id);
			pstmt.setString(2, name);
			pstmt.executeUpdate();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if(pstmt != null) {
					pstmt.close();
					pstmt = null;
				}
				if(conn != null) {
					conn.close();
					conn = null;
				}
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}

}