如何使用java变量向mysql表插入值?
您好,我正在尝试将值插入mysql表中。我正在尝试这个代码。 我已经给变量赋值,我想把那个变量传递给那个insert语句。 这是正确的吗如何使用java变量向mysql表插入值?,java,mysql,sql,Java,Mysql,Sql,您好,我正在尝试将值插入mysql表中。我正在尝试这个代码。 我已经给变量赋值,我想把那个变量传递给那个insert语句。 这是正确的吗 code int tspent = "1"; String pid = "trng"; String tid = "2.3.4"; String rid = "tup"; String des = " polish my shoes!"; INSERT INTO `time_entry`(pid,tid,rid
code
int tspent = "1";
String pid = "trng";
String tid = "2.3.4";
String rid = "tup";
String des = " polish my shoes!";
INSERT INTO `time_entry`(pid,tid,rid,tspend,description) VALUE ('"+pid+"','"+tid+"','"+rid+"',"+tspent+",'"+des+"');
这是我尝试过的,但我无法插入值
try
{
conn=DBMgr.openConnection();
String sqlQuery = "INSERT INTO `time_entry`(pid,tid,rid,tspend,description) VALUE ('"+pid+"','"+tid+"','"+rid+"',"+tspent+",'"+des+"');";
st = conn.createStatement();
rs = st.executeQuery(sqlQuery);
}
使用并使用其setXXX()方法设置值
只要查询是SQL数据操作语言语句,就应该使用
executeUpdate()
方法。此外,您当前的查询易受攻击
您应该使用PreparedStatement
:
PreparedStatement pstmt = conn.prepareStatement("INSERT INTO `time_entry`(pid,tid,rid,tspend,description) VALUES (?, ?, ?, ?, ?)");\
然后在这些索引处设置变量:
pstmt.setString(1, pid);
// Similarly for the remaining 4
// And then do an executeUpdate
pstmt.executeUpdate();
试试这个
String driver="com.mysql.jdbc.Driver";
String url="jdbc:mysql://localhost:3306/dbname";
String uname="username";
String pass="password";
Class.forName(driver);
Connection c=(Connection) DriverManager.getConnection(url,uname,pass);
Statement s=c.createStatement();
s.executeUpdate("INSERT INTO `time_entry`(pid,tid,rid,tspend,description) VALUE ('"+pid+"','"+tid+"','"+rid+"',"+tspent+",'"+des+"')");
“javaexecutesql”返回了大量的命中率:)你得到了吗exception@Sam... 很明显,这段代码甚至不会编译。将executeQuery更改为executeUpdateyou take all string。对于整型数据类型变量是否可行?
String driver="com.mysql.jdbc.Driver";
String url="jdbc:mysql://localhost:3306/dbname";
String uname="username";
String pass="password";
Class.forName(driver);
Connection c=(Connection) DriverManager.getConnection(url,uname,pass);
Statement s=c.createStatement();
s.executeUpdate("INSERT INTO `time_entry`(pid,tid,rid,tspend,description) VALUE ('"+pid+"','"+tid+"','"+rid+"',"+tspent+",'"+des+"')");
import java.sql.*;
class Adbs1{
public static void main(String args[]){
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection(
"jdbc:mysql://localhost:3306/rk","root","@dmin");
//here rk is database name, root is username and password
Statement stmt=con.createStatement();
stmt.executeUpdate("insert into emp values('rk11','Irfan')");
// stmt.executeUpdate("delete from emp where eid ='rk4'");
//stmt.executeUpdate("update emp set ename='sallu bhai' where eid='rk5'");
ResultSet rs=stmt.executeQuery("select * from emp");
while(rs.next())
System.out.println(rs.getString(1)+" "+rs.getString(2));
con.close();
}catch(Exception e){ System.out.println(e);}
}
}