prepared-statement | 易学教程

Does using preparedStatement mean there will not be any SQL Injection?

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问题 I have read that to prevent SQL Injection one must use PreparedStatement. Does that mean if i am using perparedStatement then no one can perform SQL Injection in any of my page? Is it foolproof against SQL Injection? If not then please give some example to demonstrate this. 回答1: As long as you're actually using the parameter substitution feature of the prepared statement (it's possible to misuse them and not use that feature), and provided there isn't a bug in the prepared statement library

Reusing of a PreparedStatement between methods?

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问题 We all know that we should rather reuse a JDBC PreparedStatement than creating a new instance within a loop. But how to deal with PreparedStatement reuse between different method invocations? Does the reuse-"rule" still count? Should I really consider using a field for the PreparedStatement or should I close and re-create the prepared statement in every invocation (keep it local)? (Of course an instance of such a class would be bound to a Connection which might be a disadvantage in some

mysqli fatal error: No index used in query/prepared statement

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问题 I want to execute a simple prepared Statement using mysqli, but it won't work. I have this table: CREATE TABLE IF NOT EXISTS `account` ( `id` int(11) NOT NULL AUTO_INCREMENT, `email` varchar(100) COLLATE latin1_german2_ci NOT NULL, `password` varchar(100) COLLATE latin1_german2_ci NOT NULL, `created` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_german2_ci AUTO_INCREMENT=4 ; And want to print the id of a specific email.

Prepared Statement on Postgresql in Rails

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问题 Right now I am in the middle of migrating from SQLite to Postgresql and I came across this problem. The following prepared statement works with SQLite: id = 5 st = ActiveRecord::Base.connection.raw_connection.prepare("DELETE FROM my_table WHERE id = ?") st.execute(id) st.close Unfortunately it is not working with Postgresql - it throws an exception at line 2. I was looking for solutions and came across this: id = 5 require 'pg' conn = PG::Connection.open(:dbname => 'my_db_development') conn

Prepared Statements Already Exists

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问题 I am trying to use the prepared statements in ruby with pg gem. This is how my statement looks like conn.prepare("insert_values", "insert into " + objectName + "(" + headerStr + ") values (" + prep_values + ")") conn.exec_prepared("insert_values", arr) I keep getting the error Prepared Statement insert_values already exists. How Do i Fix this?? Thanks 回答1: Try to run: conn.exec("DEALLOCATE name_of_prepared_statement") In your example: conn.exec("DEALLOCATE insert_values") Simple test and it

What's the life span of a PostgreSQL server-side prepared statement

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问题 According to the PostgreSQL documentation, a prepared statement is bound to a database session/connection: PREPARE creates a prepared statement. A prepared statement is a server-side object that can be used to optimize performance. When the PREPARE statement is executed, the specified statement is parsed, analyzed, and rewritten. When an EXECUTE command is subsequently issued, the prepared statement is planned and executed. Prepared statements only last for the duration of the current

When is quoting necessary in prepared statements of pdo in PHP?

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It's from the comment under this answer,but I really don't figure out what he means: How to change from mysql to pdo using prepared statements in PHP? When using prepared statements you never have to escape/quote a string parameter for the dbms (parser) manually. The comment relates to http://docs.php.net/pdo.prepared-statements : Prepared statements are so useful that they are the only feature that PDO will emulate for drivers that don't support them. I.e. if the driver doesn't support prepared statements PDO will still expose the prepare statements part of api and "translate" them to sql

Bind Results in C# using SQL prepared statements

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Using this: SqlConnection myConnection = new SqlConnection("Data Source=.\\SERVER;Initial Catalog=DB;Integrated Security=True;TrustServerCertificate=True;User Instance=False"); myConnection.Open(); SqlCommand myCommand = new SqlCommand("SELECT BusinessName FROM Businessess WHERE BusinessID = @Param2", myConnection); SqlParameter myParam2 = new SqlParameter("@Param2", SqlDbType.Int, 4); myParam2.Value = 1; myCommand.Parameters.Add(myParam2); MessageBox.Show(myCommand); //How do I bind results to show as string? How do I bind the results of a prepared statement to a variable so that I may

Can I get the full query that a PreparedStatement is about to execute? [duplicate]

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问题 This question already has answers here : How can I get the SQL of a PreparedStatement? (13 answers) Closed 2 years ago . I'm working with PreparedStatement with MySQL server. example: String myQuery = "select id from user where name = ?"; PreparedStatement stmt = sqlConnection.prepareStatement(myQuery); stmt.setString(1, "test"); stmt.executeQUery(); ResultSet rs = stmt.getResultSet(); How can I receive the full SQL query that is about to be executed on the MySQL server? thanks! 回答1: It's not

Using prepared statement in Groovy

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问题 this is for testing purposes (automatic testing) SoapUI def status = testRunner.testCase.getPropertyValue( "Status" ) def grid = testRunner.testCase.getPropertyValue( "Grid" )+"_V" def grid1 if (["TABLE1","TABLE2"].contains(grid)) grid1 ="HUBCFG."+grid else grid1 = "SDM."+grid Option1 sql.executeUpdate "UPDATE " +grid1+" t0 set XXX='$status' WHERE t0.YYY='$grid'" Option2 String bql = "UPDATE $grid1 t0 set XXX='$status' WHERE t0.YYY='$grid'" sql.executeUpdate bql sql.commit() log.info(