Java程序向数据库中插入数据,代码如下:
//首先创建数据库,(access,oracle,mysql,sqlsever)其中之一,其中access,sqlsever需要配置数据源(odbc)//然后再eclipse中创建类(ConnDb,Test,TestBean)ConnDb功能为连接数据库,查询,插入,删除,修改数据的类,Test为含有main方法的测试类,TestBean为数据表中的字段属性及set,get方法
//以下是ConnDb代码:
package db
import java.sql.Connection
import java.sql.DriverManager
import
java.sql.ResultSet
import java.sql.SQLException
import
java.sql.Statement
import java.util.ArrayList
public class ConnDb {
public Connection startConn(Connection conn){
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver")
conn = DriverManager.getConnection("jdbc:odbc:数据库","用户名", "密码")
} catch (Exception e) {
System.out.println("连接数据库时出现错误")
}
return conn
}
public ArrayList executeQuery(String sql){
Connection conn = null
Statement stmt = null
ResultSet rs = null
ArrayList list = new ArrayList()
try {
conn = startConn(conn)
stmt = conn.createStatement()
rs = stmt.executeQuery(sql)//sql为sql语句例如"select * from
表名",从main方法中传进来,这里用的是ArrayList 类将查询结果存储起来
while(rs.next()){
TestBean tb = new TestBean()
tb.setTid(rs.getString("tid"))
tb.setTname(rs.getString("tname"))
tb.setTinfo(rs.getString("tinfo"))
list.add(tb)
}
}
catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}finally{
closeConn(rs,stmt,conn)
}
return list
}
public void executeUpdate(String sql){
Connection conn = null
Statement stmt = null
try {
conn =
startConn(conn)
stmt = conn.createStatement()
stmt.executeUpdate(sql)
}
catch (SQLException e) {
System.out.println("修改,插入或者删除数据库数据时发生错误!")
}finally{
closeConn(stmt,conn)
}
}
public void closeConn(ResultSet rs,Statement stmt,Connection conn){
try {
if(rs !=
null){
rs.close()
}
if(stmt != null){
stmt.close()
}
if(conn != null){
conn.close()
}
}
catch (SQLException e) {
// TODO Auto-generated catch
block
System.out.println("关闭数据库的时候发生错误!")
}
}
public void closeConn(Statement stmt,Connection conn){
try {
if(stmt != null){
stmt.close()
}
if(conn != null){
conn.close()
}
}
catch (SQLException e) {
// TODO Auto-generated catch block
System.out.println("关闭数据库的时候发生错误!")
}
}
}
Java程序向数据库中插入数据,代码如下://首先创建数据库,(access,oracle,mysql,sqlsever)其中之一,其中access,sqlsever需要配置数据源(odbc)//然后再eclipse中创建类(ConnDb,Test,TestBean)ConnDb功能为连接数据库,查询,插入,删除,修改数据的类,Test为含有main方法的测试类,TestBean为数据表中的字段属性及set,get方法//以下是ConnDb代码:package dbimport java.sql.Connectionimport java.sql.DriverManagerimport java.sql.ResultSetimport java.sql.SQLExceptionimport java.sql.Statementimport java.util.ArrayListpublic class ConnDb {public Connection startConn(Connection conn){ try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver") conn = DriverManager.getConnection("jdbc:odbc:数据库","用户名", "密码") } catch (Exception e) { System.out.println("连接数据库时出现错误") } return conn} public ArrayList executeQuery(String sql){ Connection conn = null Statement stmt = null ResultSet rs = null ArrayList list = new ArrayList() try { conn = startConn(conn) stmt = conn.createStatement() rs = stmt.executeQuery(sql)//sql为sql语句例如"select * from 表名",从main方法中传进来,这里用的是ArrayList 类将查询结果存储起来 while(rs.next()){TestBean tb = new TestBean() tb.setTid(rs.getString("tid")) tb.setTname(rs.getString("tname")) tb.setTinfo(rs.getString("tinfo")) list.add(tb) } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace() }finally{ closeConn(rs,stmt,conn) } return list} public void executeUpdate(String sql){ Connection conn = null Statement stmt = null try { conn = startConn(conn) stmt = conn.createStatement() stmt.executeUpdate(sql) } catch (SQLException e) { System.out.println("修改,插入或者删除数据库数据时发生错误!") }finally{ closeConn(stmt,conn) } } public void closeConn(ResultSet rs,Statement stmt,Connection conn){ try { if(rs != null){rs.close() } if(stmt != null){stmt.close() } if(conn != null){conn.close() } } catch (SQLException e) { // TODO Auto-generated catch block System.out.println("关闭数据库的时候发生错误!") } } public void closeConn(Statement stmt,Connection conn){ try { if(stmt != null){stmt.close() } if(conn != null){conn.close() } } catch (SQLException e) { // TODO Auto-generated catch block System.out.println("关闭数据库的时候发生错误!") } }}
(1)传统方式持久化数据库对象 —— 表 如:Hibernate等;
//保存一个数据库对象
public boolean saveEntity(Object entity) {
try {
getHibernateTemplate().save(entity)
return true
} catch (Exception e) {
e.printStackTrace()
}
return false
}
(2) 直接SQL语句插入
如:insert into ......
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