Difference between Statement and PreparedStatement

Question

The Prepared Statement is a slightly more powerful version of a Statement  and should always be at least as quick and easy to handle as a Statement  The Prepared Statement may be parametrized   Most relational databases handles a JDBC   SQL query in four steps      Parse the incoming SQL query   Compile the SQL query   Plan optimize the data acquisition path   Execute the optimized query   acquire and return data     A Statement will always proceed through the four steps above for each SQL query sent to the database  A Prepared Statement pre-executes steps  1  -  3  in the execution process above  Thus  when creating a Prepared Statement some pre-optimization is performed immediately  The effect is to lessen the load on the database engine at execution time     Now my question is that -  Is any other advantage of using Prepared Statement

User · Answer

Statement interface executes static SQL statements without parameters  PreparedStatement interface  extending Statement  executes a precompiled SQL statement with without parameters   Efficient for repeated executions It is precompiled so it s faster

User · Answer

nothing much to add   1 - if you want to execute a query in a loop  more than 1 time   prepared statement can be faster  because of optimization that you mentioned   2 - parameterized query is a good way to avoid SQL Injection  Parameterized querys are only available in PreparedStatement

User · Answer

PreparedStatement is a very good defense  but not foolproof  in preventing SQL injection attacks   Binding parameter values is a good way to guarding against  little Bobby Tables  making an unwanted visit

User · Answer

Statement is static and prepared statement is dynamic  Statement is suitable for DDL and prepared statment for DML  Statement is slower while prepared statement is faster  more differences  archived

User · Answer

Statement will be used for executing static SQL statements and it can t accept input parameters   PreparedStatement will be used for executing SQL statements many times dynamically  It will accept input parameters

User · Answer

Advantages of a PreparedStatement    Precompilation and DB-side caching of the SQL statement leads to overall faster execution and the ability to reuse the same SQL statement in batches  Automatic prevention of SQL injection attacks by builtin escaping of quotes and other special characters  Note that this requires that you use any of the PreparedStatement setXxx   methods to set the values   preparedStatement   connection prepareStatement  INSERT INTO Person  name  email  birthdate  photo  VALUES                 preparedStatement setString 1  person getName     preparedStatement setString 2  person getEmail     preparedStatement setTimestamp 3  new Timestamp person getBirthdate   getTime      preparedStatement setBinaryStream 4  person getPhoto     preparedStatement executeUpdate      and thus don t inline the values in the SQL string by string-concatenating   preparedStatement   connection prepareStatement  INSERT INTO Person  name  email  VALUES       person getName              person getEmail           preparedStatement executeUpdate     Eases setting of non-standard Java objects in a SQL string  e g  Date  Time  Timestamp  BigDecimal  InputStream  Blob  and Reader  Clob   On most of those types you can t  just  do a toString   as you would do in a simple Statement  You could even refactor it all to using PreparedStatement setObject   inside a loop as demonstrated in the utility method below   public static void setValues PreparedStatement preparedStatement  Object    values  throws SQLException       for  int i   0  i  lt  values length  i              preparedStatement setObject i   1  values i              Which can be used as below   preparedStatement   connection prepareStatement  INSERT INTO Person  name  email  birthdate  photo  VALUES                 setValues preparedStatement  person getName    person getEmail    new Timestamp person getBirthdate   getTime     person getPhoto     preparedStatement executeUpdate

User · Answer

Some of the benefits of PreparedStatement over Statement are    PreparedStatement helps us in preventing SQL injection attacks because it automatically escapes the special characters  PreparedStatement allows us to execute dynamic queries with parameter inputs  PreparedStatement provides different types of setter methods to set the input parameters for the query  PreparedStatement is faster than Statement  It becomes more visible when we reuse the PreparedStatement or use it   s batch processing methods for executing multiple queries  PreparedStatement helps us in writing object Oriented code with setter methods whereas with Statement we have to use String Concatenation to create the query  If there are multiple parameters to set  writing Query using String concatenation looks very ugly and error prone    Read more about SQL injection issue at http   www journaldev com 2489 jdbc-statement-vs-preparedstatement-sql-injection-example

User · Answer

Another characteristic of Prepared or Parameterized Query  Reference taken from this article   This statement is one of features of the database system in which same SQL statement executes repeatedly with high efficiency  The prepared statements are one kind of the Template and used by application with different parameters   The statement template is prepared and sent to the database system and database system perform parsing  compiling and optimization on this template and store without executing it   Some of parameter like  where clause is not passed during template creation later application  send these parameters to the database system and database system use template of SQL Statement and executes as per request   Prepared statements are very useful against SQL Injection because the application can prepare parameter using different techniques and protocols   When the number of data is increasing and indexes are changing frequently at that time Prepared Statements might be fail because in this situation require a new query plan

User · Answer

It s easier to read You can easily make the query string a constant

User · Answer

They are pre-compiled  once   so faster for repeated execution of dynamic SQL  where parameters change  Database statement caching boosts DB execution performance  Databases store caches of execution plans for previously executed statements  This allows the database engine to reuse the plans for statements that have been executed previously  Because PreparedStatement uses parameters  each time it is executed it appears as the same SQL  the database can reuse the previous access plan  reducing processing   Statements  inline  the parameters into the SQL string and so do not appear as the same SQL to the DB  preventing cache usage  Binary communications protocol means less bandwidth and faster comms calls to DB server  Prepared statements are normally executed through a non-SQL binary protocol   This means that there is less data in the packets  so communications to the server is faster   As a rule of thumb network operations are an order of magnitude slower than disk operations which are an order of magnitude slower than in-memory CPU operations   Hence  any reduction in amount of data sent over the network will have a good effect on overall performance  They protect against SQL injection  by escaping text for all the parameter values provided  They provide stronger separation between the query code and the parameter values  compared to concatenated SQL strings   boosting readability and helping code maintainers quickly understand inputs and outputs of the query  In java  can call getMetadata   and getParameterMetadata   to reflect on the result set fields and the parameter fields  respectively In java  intelligently accepts java objects as parameter types via setObject  setBoolean  setByte  setDate  setDouble  setDouble  setFloat  setInt  setLong  setShort  setTime  setTimestamp - it converts into JDBC type format that is comprehendible to DB  not just toString   format   In java  accepts SQL ARRAYs   as parameter type via setArray method In java  accepts CLOBs  BLOBs  OutputStreams and Readers as parameter  feeds  via setClob setNClob  setBlob  setBinaryStream  setCharacterStream setAsciiStream setNCharacterStream methods  respectively In java  allows DB-specific values to be set for SQL DATALINK  SQL ROWID  SQL XML  and NULL via setURL  setRowId  setSQLXML ans setNull methods In java  inherits all methods from Statement   It inherits the addBatch method  and additionally allows a set of parameter values to be added to match the set of batched SQL commands via addBatch method  In java  a special type of PreparedStatement  the subclass CallableStatement  allows stored procedures to be executed - supporting high performance  encapsulation  procedural programming and SQL  DB administration maintenance tweaking of logic  and use of proprietary DB logic  amp  features

User · Answer

Dont get confusion   simply remember    Statement is used for static queries like DDLs i e  create drop alter and prepareStatement is used for dynamic queries i e  DML query  In Statement   the query is not precompiled while in prepareStatement query is precompiled  because of this prepareStatement is time efficient  prepareStatement takes argument at the time of creation while Statement does not take arguments  For Example if you want to create table and insert element then     Create table  static  by using Statement and Insert element  dynamic by using prepareStatement

User · Answer

Can t do CLOBs in a Statement   And   OraclePreparedStatement  ps

User · Answer

I followed all the answers of this question to change a working legacy code using - Statement   but having SQL Injections    to a solution using PreparedStatement with a much slower code because of poor understanding of semantics around Statement addBatch String sql   amp  PreparedStatement addBatch      So I am listing my scenario here so others don t make same mistake    My scenario was   Statement statement   connection createStatement     for  Object object   objectList          Create a query which would be different for each object         Add this query to statement for batch using - statement addBatch query     statement executeBatch      So in above code   I had thousands of different queries  all added to same statement and this code worked faster because statements not being cached was good  amp  this code executed rarely in the app    Now to fix SQL Injections  I changed this code to     List lt PreparedStatement gt  pStatements   new ArrayList lt  gt         for  Object object   objectList          Create a query which would be different for each object      PreparedStatement pStatement  connection prepareStatement query          This query can t be added to batch because its a different query so I used list         Set parameter to pStatement using object      pStatements add pStatement       Object loop    In place of statement executeBatch      I had to loop around the list  amp  execute each update separately           for  PreparedStatement ps   pStatements        ps executeUpdate        So you see  I started creating thousands of PreparedStatement objects  amp  then eventually not able to utilize batching because my scenario demanded that - there are thousands of UPDATE or INSERT queries  amp  all of these queries happen to be different    Fixing SQL injection was mandatory at no cost of performance degradation and I don t think that it is possible with PreparedStatement in this scenario    Also  when you use inbuilt batching facility  you have to worry about closing only one Statement but with this List approach  you need to close statement before reuse   Reusing a PreparedStatement

User · Answer

As Quoted by mattjames     The use of a Statement in JDBC should be 100  localized to being used   for DDL  ALTER  CREATE  GRANT  etc  as these are the only statement   types that cannot accept BIND VARIABLES  PreparedStatements or   CallableStatements should be used for EVERY OTHER type of statement    DML  Queries   As these are the statement types that accept bind   variables       This is a fact  a rule  a law -- use prepared statements EVERYWHERE    Use STATEMENTS almost no where

User · Answer

sql injection is ignored by prepared statement so security is increase in prepared statement

[java] Difference between Statement and PreparedStatement

Examples related to java

Examples related to jdbc