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PROGRAMMING WITH SQL
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SQL: The Complete Reference
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Function
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SQLAllocHandle() SQLFreeHandle() SQLAllocEnv() SQLFreeEnv() SQLAllocConnect() SQLFreeConnect() SQLAllocStmt() SQLFreeStmt() SQLConnect() SQLDisconnect() Statement execution SQLExecDirect() SQLPrepare() SQLExecute() SQLRowCount() Transaction management SQLEndTran() SQLCancel() Parameter handling SQLBindParam() SQLParamData() SQLPutData() Query results processing SQLSetCursorName() SQLGetCursorName() SQLFetch() Table 19-2.
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Allocates resources for environment, connection, descriptor, or statement Frees previously allocated resources Allocates resources for a SQL environment Frees resources for a SQL environment Allocates resources for a database connection Frees resources for a database connection Allocates resources for a SQL statement Frees resources for a SQL statement Establishes a database connection Ends an established database connection
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Directly executes a SQL statement Prepares a SQL statement for subsequent execution Executes a previously prepared SQL statement Gets number of rows affected by last SQL statement
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Ends a SQL transaction Cancels execution of a SQL statement
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Binds program location to a parameter value Processes deferred parameter values Provides deferred parameter value or a portion of a character string value
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Sets the name of a cursor Obtains the name of a cursor Fetches a row of query results
SQL/CLI API Functions
19:
SQL APIs
Function
SQLFetchScroll() SQLCloseCursor() SQLGetData() Query results description SQLNumResultCols() SQLDescribeCol() SQLColAttribute() SQLGetDescField() SQLSetDescField() SQLGetDescRec() SQLSetDescRec() SQLCopyDesc() Error handling SQLError() SQLGetDiagField() SQLGetDiagRec() Attribute management SQLSetEnvAttr() SQLGetEnvAttr() SQLSetStmtAttr() SQLGetStmtAttr() Driver management SQLDataSources() SQLGetFunctions() SQLGetInfo()
Description
Fetches a row of query results with scrolling Closes an open cursor Obtains the value of a query results column
Query results processing (continued)
Determines the number of query results columns Describes a single query results column Gets attribute of a query results column Gets value of a descriptor field Sets value of a descriptor field Gets values from a descriptor record Sets values in a descriptor record Copies descriptor area values
Obtains error information Gets value of a diagnostic record field Gets value of the diagnostic record
Sets attribute value for a SQL environment Retrieves attribute value for a SQL environment Sets descriptor area to be used for a SQL statement Gets descriptor area for a SQL statement
Gets a list of available SQL servers Gets information about supported features of a SQL implementation Gets information about supported features of a SQL implementation
PROGRAMMING WITH SQL
Table 19-2.
SQL/CLI API Functions (continued)
SQL: The Complete Reference
/* Program to raise all quotas by a user-specified amount */ #include <sqlcli.h> /* header file with CLI definitions */ main() { SQLHENV env_hdl; SQLHDBC conn_hdl; SQLHSTMT stmt_hdl; SQLRETURN status; char *svr_name = demo ; char *user_name = joe ; char *user_pswd = xyz ; /* /* /* /* /* /* /* SQL-environment handle */ connection handle */ statement handle */ CLI routine return status */ server name */ user name for connection */ user password for connection */
char amount_str[31]; /* amount entered by user */ char stmt_buf[128]; /* buffer for SQL statement */ /* Allocate handles for SQL environment, connection, statement */ SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &env_hdl); SQLAllocHandle(SQL_HANDLE_DBC, env_hdl, &conn_hdl); SQLAllocHandle(SQL_HANDLE_STMT, conn_hdl, &stmt_hdl); /* Connect to the database, passing server name, user, password */ /* SQL_NTS says NULL-terminated string instead of passing length */ SQLConnect(conn_hdl, svr_name, SQL_NTS, user_name, SQL_NTS, user_pswd, SQL_NTS); /* Prompt the user for the amount of quota increase/decrease */ printf( Raise/lower quotas by how much: ); gets(amount_str); /* Assemble UPDATE statement and ask DBMS to execute it */ strcpy(stmt_buf, update salesreps set quota = quota + ); strcat(stmt_buf, amount_str); status = SQLExecDirect(stmt_hdl, stmt_buf, SQL_NTS); if (status) printf( Error during update\n ); else printf( Update successful.\n );
Figure 19-11.
A simple program using SQL/CLI
19:
SQL APIs
/* Commit updates and disconnect from database server */ SQLEndTran(SQL_HANDLE_ENV, env_hdl, SQL_COMMIT); SQLDisconnect(conn_hdl); /* Deallocate handles and exit */ SQLFreeHandle(SQL_HANDLE_STMT, stmt_hdl); SQLFreeHandle(SQL_HANDLE_DBC, conn_hdl); SQLFreeHandle(SQL_HANDLE_ENV, env_hdl); exit(); }
Figure 19-11.
A simple program using SQL/CLI (continued)
All of the CLI routines return a status code indicating either successful completion of the routine or some type of error or warning about its execution. The values for the CLI return status codes are summarized in Table 19-3. Some of the program examples in this book omit the checking of return status codes to shorten the example and focus on the specific features being illustrated. However, production programs that call CLI functions should always check the return value to ensure that the function was completed successfully. Symbolic constant names for the return status codes as well as many other values, such as data type codes and statement-id codes, are typically defined in a header file that is included at the beginning of a program that uses the CLI.
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