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How to write sql statement servlet using placeholders

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Learn Java by Examples. Everything you want to know about Java. Pin It. Tweet A simple web application showing how to query a table in a database i. Here I am using MySql as Database so I have downloaded the jar with name as : "mysql-connector-java
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SQL Injection and How to Prevent It?

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Insert Records Using PreparedStatement : PreparedStatement « Database SQL JDBC « Java

With dynamic SQL, you can directly execute any kind of SQL statement even data definition and data control statements. You can build statements where you do not know table names, WHERE clauses, and other information in advance. Some programs must build and process SQL statements where some information is not known in advance. A reporting application might build different SELECT statements for the various reports it generates, substituting new table and column names and ordering or grouping by different columns.
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Insert Records Using PreparedStatement : PreparedStatement « Database SQL JDBC « Java

It is useful when writing general-purpose and flexible programs like ad hoc query systems, when writing programs that must run database definition language DDL statements, or when you do not know at compilation time the full text of a SQL statement or the number or data types of its input and output variables. However, to write native dynamic SQL code, you must know at compile time the number and data types of the input and output variables of the dynamic SQL statement. Successful compilation verifies that static SQL statements reference valid database objects and that the necessary privileges are in place to access those objects. For more information about SQL cursor attributes, see "Cursors".
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The setter method that you use is determined by the data type of the value that you want to pass into the SQL statement. When you pass a value to the setter method, you must specify not only the actual value to be used in the SQL statement, but also the parameter's ordinal placement in the SQL statement. For example, if your SQL statement contains a single parameter, its ordinal value will be 1.
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