Can Tablenames Be Dynamically Set in Java PreparedStatement INSERT Queries?

Can the table name be dynamically set in Java PreparedStatement INSERT query?

When creating bulk INSERT queries using Java PreparedStatement, you may need to insert data into different tables with the same column format. The query statement requires both field values ​​and table names as variables.

However, PreparedStatement only allows you to set parameters for column values, not table names. Hardcoding table names defeats the purpose of using prepared statements.

Solution

Unfortunately, it is not possible to use dynamic variables as table names in this case. PreparedStatement is designed to prevent SQL injection by only allowing you to specify the value that will be inserted into the database. The table name is a structural element of the query and therefore cannot be set dynamically.

You need to dynamically build the SQL statement using string concatenation or placeholders (such as String.format). Here is an example using string concatenation:

<code class="language-java">String tableName = "tableName1";
String strQuery = "INSERT INTO " + tableName + 
    " (col1, col2, col3, col4, col5) VALUES (?,?,?,?,?);";</code>

This will create a new strQuery containing the specific table name inserted into the statement. You can then use this modified strQuery to create a PreparedStatement and set the column values ​​accordingly.

Please note that while this approach avoids the SQL injection risk of using dynamic table names, it sacrifices the performance and readability benefits of PreparedStatement. In practical applications, the pros and cons need to be weighed according to specific circumstances. If the number of table names is limited, it may be more efficient to consider using multiple prepared statements.

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