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将某些PreparedStatement对象改为Statement对象 #31

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将某些PreparedStatement对象改为Statement对象 #31

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8 changes: 8 additions & 0 deletions .idea/.gitignore
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9 changes: 9 additions & 0 deletions .idea/StudentManagement.iml
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6 changes: 6 additions & 0 deletions .idea/compiler.xml
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9 changes: 9 additions & 0 deletions .idea/misc.xml
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8 changes: 8 additions & 0 deletions .idea/modules.xml
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6 changes: 6 additions & 0 deletions .idea/vcs.xml
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18 changes: 9 additions & 9 deletions code/src/dao/UserDao.java
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Original file line number Diff line number Diff line change
Expand Up @@ -17,8 +17,8 @@ public boolean userIsExist(String username) {
Connection conn = DBUtils.getConnection();
String sql = "select * from user where username = ?";
try{
//获取PreparedStatement对象
PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
//获取Statement对象
Statement ps = (Statement) conn.Statement(sql);
ps.setString(1, username);//给用户对象属性赋值
ResultSet rs = ps.executeQuery();
if (rs.next()) {
Expand All @@ -42,8 +42,8 @@ public User login(String username,String password) {
String sql = "select * from user where username = ? and password = ?;";

try {
//获取PreparedStatement对象
PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
//获取Statement对象
Statement ps = (Statement) conn.Statement(sql);
//对sql参数进行动态赋值
ps.setString(1, username);
ps.setString(2, password);
Expand Down Expand Up @@ -98,7 +98,7 @@ public String level(String username){
String sql = "select level from user where username = ?;";
String level = null;
try {
PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
Statement ps = (Statement) conn.Statement(sql);
ps.setString(1, username);
ResultSet rs = ps.executeQuery();
if(rs.next()){//存在该用户
Expand All @@ -121,7 +121,7 @@ public ArrayList<User> query_all_user() {
ArrayList<User> results = new ArrayList<User>();

try {
PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
Statement ps = (dStatement) conn.Statement(sql);
ResultSet rs = ps.executeQuery();

while(rs.next()){
Expand All @@ -148,7 +148,7 @@ public int insert_user(String username,String password,String level){

int flag = 0;
try {
PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
Statement ps = (Statement) conn.Statement(sql);

ps.setString(1, username);
ps.setString(2, password);
Expand All @@ -169,7 +169,7 @@ public int delete_user(String username) {

int flag = 0;
try {
PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
Statement ps = (Statement) conn.Statement(sql);
ps.setString(1, username);
flag = ps.executeUpdate();
ps.close();
Expand All @@ -187,7 +187,7 @@ public int alter_user(String username,String after_username,String after_passwor

int flag = 0;
try {
PreparedStatement ps = (PreparedStatement) conn.prepareStatement(sql);
Statement ps = (Statement) conn.Statement(sql);
ps.setString(1, after_username);
ps.setString(2, after_password);
ps.setString(3, after_level);
Expand Down