org.exolab.castor.util
Class SqlBindParser
java.lang.Object
org.exolab.castor.util.SqlBindParser
public final class SqlBindParser
extends java.lang.Object
Utility class to parse an SQL or OQL expression for bind variables
Bind variables are subexpressions of the form "$n", where n is a
positive integer number.
To parse the expression, call SqlBindParser.next() in a loop
until no more bind variable can be found. Each call moves on to
the next bind variable and returns true if another could be found.
Inside the loop call SqlBindParser.getBindExpr() to access the
current bind variable expression. ("$1", "$2", ...)
SqlBindParser.getParamNumber() can be used to read the parameter
number (1, 2, ...).
If you are interested in the remainder of the expression string,
just call getLastExpr() to get the last processed substring.
For example, when parsing the expression
"select * from x where id between $1 and $2"
this gives you the following function returns:
next() -> true
getLastExpr() -> "select * from x where id between "
getBindExpr() -> "$1"
getParamNumber() -> 1
next() -> true
getLastExpr() -> " and "
getBindExpr() -> "$2"
getParamNumber() -> 2
next() -> false
getLastExpr() -> ""
SqlBindParser(String sql) - Create a new SqlBindParser instance to parse the expression in 'sql'.
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static void | bindJdbcValues(PreparedStatement stmt, String pre_sql, Object[] values) - Binds values to prepared SQL statement using the given
sql string as reference for the bind variable order.
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String | getBindExpr() - Returns the current bind variable expression, e.g.
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static String | getJdbcSql(String pre_sql) - Creates a SQL statement from pre_sql, replacing bind expressions like "?1" by "?"
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String | getLastExpr() - Returns the expression substring beginning after the
last processed bind variable and ending just before the
current bind variable.
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int | getParamNumber() - Returns the parameter number of the current bind variable,
for example 1 a "$1" bind variable.
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boolean | next() - Move on to the next bind variable in '_sql'.
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SqlBindParser
public SqlBindParser(String sql)
Create a new SqlBindParser instance to parse the expression in 'sql'.
sql
- expression to be parsed
bindJdbcValues
public static void bindJdbcValues(PreparedStatement stmt,
String pre_sql,
Object[] values)
throws SQLException
Binds values to prepared SQL statement using the given
sql string as reference for the bind variable order.
stmt
- JDBC statementpre_sql
- SQL statement string with bind variables of the form "?1"values
- array of bind values
getBindExpr
public String getBindExpr()
Returns the current bind variable expression, e.g. "$1".
- current bind variable expression
getJdbcSql
public static String getJdbcSql(String pre_sql)
Creates a SQL statement from pre_sql, replacing bind expressions like "?1" by "?"
pre_sql
- SQL statement string with bind variables of the form "?1"
- SQL statement string with bind variables of the form "?"
getLastExpr
public String getLastExpr()
Returns the expression substring beginning after the
last processed bind variable and ending just before the
current bind variable.
- last expression substring
getParamNumber
public int getParamNumber()
Returns the parameter number of the current bind variable,
for example 1 a "$1" bind variable.
If an un-numbered bind variable "$" is found, 0 is returned.
- parameter number of current bind variable
next
public boolean next()
Move on to the next bind variable in '_sql'.
- true, if an bind variable could be found
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