how to add qr code in crystal report Figure 5-1 shows the steps Oracle takes to execute a DML statement. in Font

Print Code 39 Full ASCII in Font Figure 5-1 shows the steps Oracle takes to execute a DML statement.

Figure 5-1 shows the steps Oracle takes to execute a DML statement.
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CHAPTER 5 STATEMENT AND PREPAREDSTATEMENT
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Oracle s Statement Processing Algorithm
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DML statement submitted Does cursor exist in session cache No Yes Found error Yes Give error message and exit No Check syntax and semantics
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Is statement in shared memory pool
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Yes Soft Parse: Reuse execution plan generated earlier
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Hard Parse: Generate an optimal execution plan
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Figure 5-1. The steps Oracle takes to process and execute a DML statement (see http://asktom.oracle.com and 5 of Tom Kyte s Effective Oracle by Design [Osborne McGraw-Hill, ISBN: 0-07-223065-7] for a detailed explanation of this algorithm) The goal when writing SQL statements in Oracle is to avoid repeated hard parsing and to minimize soft parsing. In this chapter, we ll focus on how to avoid hard parsing in JDBC programs. In 14, we ll cover techniques for minimizing soft parsing.
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JDBC API for Statements
You re now ready to enter the exciting world of statements in JDBC. Recall that the standard JDBC API consists of two packages (see the section Overview of JDBC API in 3): java.sql: Contains the core JDBC API to access and manipulate information stored in a database, which includes the Statement interface and those that inherit from it (e.g., PreparedStatement and CallableStatement) javax.sql: Contains APIs for accessing server-side data sources from JDBC clients
CHAPTER 5 STATEMENT AND PREPAREDSTATEMENT
Oracle s core JDBC implementation lies in the following two packages: oracle.jdbc (and packages beneath it): Implements and extends functionality provided by java.sql and javax.sql interfaces (e.g., OraclePreparedStatement and OracleCallableStatement) oracle.sql: Contains classes and interfaces that provide Java mappings to SQL data types (e.g., oracle.sql.OracleTypes) Figure 5-2 shows the JDBC classes pertinent to statements (also shown are the Connection and ResultSet interfaces, since they are relevant to most JDBC code using statements).
Connection, ResultSet, and Statement Interfaces
Standard JDBC interfaces from java.sql package ResultSet Standard JDBC interfaces from oracle.jdbc package OracleResultSet
Connection
OracleConnection
Statement
OracleStatement
PreparedStatement
OraclePreparedStatement
CallableStatement
OracleCallableStatement
Figure 5-2. JDBC Connection, ResultSet, and Statement interfaces and the implementing (or extending) Oracle interfaces On the left side of Figure 5-2 are JDBC interfaces in java.sql package, and on the right side are the corresponding Oracle interfaces in the oracle.jdbc package. Note that OracleStatement is an interface that extends Statement, OraclePreparedStatement is an interface that extends both OracleStatement and PreparedStatement, and so on.
CHAPTER 5 STATEMENT AND PREPAREDSTATEMENT
I frequently use the command javap (available with the JDK) to examine the public methods Tip
of a class or an interface. For example, for finding out all public methods of the class oracle.jdbc .OraclePreparedStatement, you can execute the following command (after setting the environment and CLASSPATH as explained in 3):
javap oracle.jdbc.OraclePreparedStatement
In general, the prefix Oracle denotes an interface or a class that extends a JDBC standard interface or class, and provides its own Oracle-specific extensions in addition to the standard JDBC API functionality. For example, java.sql.Connection is a JDBC standard interface, and oracle.jdbc.OracleConnection is an interface that extends java.sql.Connection. Table 5-1 shows an overview of Oracle s key interfaces related to Connection, Statement, and ResultSet functionality. Table 5-1. JDBC Standard and Oracle Proprietary Interfaces Related to Connection, Statement, and ResultSet
Class or Interface in the oracle.jdbc Package
OracleConnection
Extends or Implements
java.sql.Connection
Main Functionality
Encapsulates a database connection. It has methods to return Oracle statement objects and methods to set Oracle performance extensions for any statement executed by the current connection. Has methods to execute SQL statements (including stored procedures) without bind variables.
OracleStatement
java.sql.Statement
OraclePreparedStatement
java.sql.PreparedStatement, Has methods to execute SQL OracleStatement statements (including stored
procedures) with bind variables. In the case of stored procedures, you cannot retrieve any result values back using PreparedStatement.
OracleCallableStatement
OraclePreparedStatement, java.sql.CallableStatement java.sql.ResultSet
Adds methods to PreparedStatement to execute and retrieve data from stored procedures. Contains data representing a data base result set, which is obtained by executing queries against a database.
OracleResultSet
CHAPTER 5 STATEMENT AND PREPAREDSTATEMENT
The Statement Interface
The Statement interface is used to execute a SQL statement and return its results to the JDBC program. 3 presented an example of using this interface in the class GetEmpDetails. In this section, we will cover how to query and modify data using the Statement interface. For use in our example, we first create a simple table, t1, and a PL/SQL procedure, p2, that inserts a row in table t1 as shown: scott@ORA10G> create table t1 2 ( 3 x number 4 ); Table created. scott@ORA10G> create or replace procedure p2( p_x in number ) 2 as 3 begin 4 insert into t1 values( p_x ); 5 end; 6 / Procedure created. Assuming you have a connection object initialized (as explained in 3), the steps involved in using a Statement interface are as follows: 1. Create a Statement object for the SQL statement: Statement stmt = conn.createStatement(); 2a. The method used to execute a Statement object depends on the type of SQL statement being executed. If you want to execute a query using a select statement, then use the executeQuery() method: public ResultSet executeQuery(String sql) throws SQLException; 2b. If you want to execute a data-modifying statement such as insert, delete, update, etc., or a SQL statement that does not return anything, such as a DDL statement, use the executeUpdate() method of the Statement object. The method returns either the row count for the insert, update, delete, or merge statement, or 0 for SQL statements that return nothing. The signature of the method follows: public int executeUpdate(String sql) throws SQLException; 2c. If you don t know the statement type, you can use the execute() method of the Statement interface. For example, if the statement string is a query and you don t know that (because, for example, it is in a variable passed to you by some other program), you could use the execute() method: public boolean execute(String sql) throws SQLException; 2d. If you want to execute a stored procedure (without using bind variables and without being able to retrieve data returned from the procedure), you can use the execute() method.
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