Java数据库增删改查

数据库为MySQL数据库，Oracle数据库类似：

表结构参照

插入数据

package com.jef.sql;

import java.sql.Connection;
import java.sql.PreparedStatement;

/**
 * //演示如何使用com.mysql.jdbc连接桥连接Mysql，插入内容，共三种方式：静态的两种executeUpdate()，executeBatch()，动态的PrepareStatement，
 * 实时动态时可以采用PrepareStatement()和executeBatch()的结合，删除、修改都有这三种方法
 */
public class JavaCtMysqlInsert {
    public static void main(String[] args) {
        try {
            Connection ct = ConnectionMySQL.getMySQLConnection();
            ct.setAutoCommit(false);
            PreparedStatement ps = ct.prepareStatement("insert into user values(?, ?)");
            ps.setString(1, "ranye");
            ps.setString(2, "100");
            ps.executeUpdate();
            ps.clearParameters();
            ct.commit();
            ct.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

package com.jef.sql;

import java.sql.Connection;
import java.sql.Statement;

public class JavaCtMysqlInsertTwo {
    public static void main(String[] args) {
        try {
            Connection ct = ConnectionMySQL.getMySQLConnection();
            ct.setAutoCommit(false);
            Statement sm = ct.createStatement();
            sm.addBatch("insert into user values('dage', 100)");
            sm.addBatch("insert into user values('haonan', 100)");
            sm.executeBatch();
            ct.commit();
            sm.close();
            ct.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

package com.jef.sql;

import java.sql.Connection;
import java.sql.Statement;

public class JavaCtMysqlInsertThree {
    public static void main(String[] args) {
        try {
            Connection ct = ConnectionMySQL.getMySQLConnection();
            ct.setAutoCommit(false);
            Statement sm = ct.createStatement();
            sm.executeUpdate("insert into user values('yuanyuan', '100')");
            ct.commit();
            sm.close();
            ct.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

删除数据

package com.jef.sql;

import java.sql.Connection;
import java.sql.Statement;

public class JavaCtMysqlDelete {
    public static void main(String[] args) {
        try {
            Connection ct = ConnectionMySQL.getMySQLConnection();
            Statement sm = ct.createStatement();
            sm.executeUpdate("delete from user where name='tufujie'");
            sm.close();
            ct.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

package com.jef.sql;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

public class JavaCtMysqlDeleteTwo {
    public static void main(String[] args) {
        try {
            Connection ct = ConnectionMySQL.getMySQLConnection();
            Statement sm = ct.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
            ResultSet rs = sm.executeQuery("select * from user where name='dage'");// 从查询到的内容中进行修改、插入和删除
            rs.last();
            rs.deleteRow();
            rs.close();
            sm.close();
            ct.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

修改数据

package com.jef.sql;

import java.sql.Connection;
import java.sql.Statement;

public class JavaCtMysqlUpdate {
    public static void main(String[] args) {
        try {
            Connection ct = ConnectionMySQL.getMySQLConnection();
            Statement sm = ct.createStatement();
            sm.executeUpdate("update user set name='ran' where name='ranye'");
            sm.close();
            ct.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

查询数据

package com.jef.sql;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * 当前情况下至少需要4+2条数据存在，特殊场景需捕获或者抛出
 */
public class JavaCtMysqlSelect {
    public static void main(String[] args) {
        try {
            Connection conn = ConnectionMySQL.getMySQLConnection();
            Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
                    ResultSet.CONCUR_READ_ONLY);
            ResultSet result = stmt.executeQuery("select * from user");
            System.out.println("从末尾数据开始输出");
            result.last();
            System.out.println(result.getString("name") + "\t" + result.getString("password"));
            while (result.previous())
                System.out.println(result.getString("name") + "\t" + result.getString("password"));
            System.out.println("从起始数据开始输出");
            result.first();
            System.out.println(result.getString("name") + "\t" + result.getString("password"));
            while(result.next())
                System.out.println(result.getString("name") + "\t" + result.getString("password"));

            // 指定第几笔数据
            System.out.println("指定第几笔数据，这里指定第4笔数据");
            result.absolute(4);
            System.out.println(result.getString("name") + "\t" + result.getString("password"));

            // 从目前游标处指定游标下移数
            System.out.println("从目前游标处指定游标位置，这里向下移动2笔数据");
            result.relative(2);
            System.out.println(result.getString("name") + "\t" + result.getString("password"));
            result.close();
            stmt.close();
            conn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}