spring CallMetaDataContext 源码
spring CallMetaDataContext 代码
文件路径：/spring-jdbc/src/main/java/org/springframework/jdbc/core/metadata/CallMetaDataContext.java
/*
* Copyright 2002-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.jdbc.core.metadata;
import java.sql.DatabaseMetaData;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import javax.sql.DataSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.dao.InvalidDataAccessApiUsageException;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.SqlOutParameter;
import org.springframework.jdbc.core.SqlParameter;
import org.springframework.jdbc.core.SqlParameterValue;
import org.springframework.jdbc.core.SqlReturnResultSet;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;
import org.springframework.jdbc.core.namedparam.SqlParameterSourceUtils;
import org.springframework.jdbc.support.JdbcUtils;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;
/**
* Class to manage context meta-data used for the configuration
* and execution of a stored procedure call.
*
* @author Thomas Risberg
* @author Juergen Hoeller
* @author Kiril Nugmanov
* @since 2.5
*/
public class CallMetaDataContext {
// Logger available to subclasses
protected final Log logger = LogFactory.getLog(getClass());
// Name of procedure to call
@Nullable
private String procedureName;
// Name of catalog for call
@Nullable
private String catalogName;
// Name of schema for call
@Nullable
private String schemaName;
// List of SqlParameter objects to be used in call execution
private List<SqlParameter> callParameters = new ArrayList<>();
// Actual name to use for the return value in the output map
@Nullable
private String actualFunctionReturnName;
// Set of in parameter names to exclude use for any not listed
private Set<String> limitedInParameterNames = new HashSet<>();
// List of SqlParameter names for out parameters
private List<String> outParameterNames = new ArrayList<>();
// Indicates whether this is a procedure or a function
private boolean function = false;
// Indicates whether this procedure's return value should be included
private boolean returnValueRequired = false;
// Should we access call parameter meta-data info or not
private boolean accessCallParameterMetaData = true;
// Should we bind parameter by name
private boolean namedBinding;
// The provider of call meta-data
@Nullable
private CallMetaDataProvider metaDataProvider;
/**
* Specify the name used for the return value of the function.
*/
public void setFunctionReturnName(String functionReturnName) {
this.actualFunctionReturnName = functionReturnName;
}
/**
* Get the name used for the return value of the function.
*/
public String getFunctionReturnName() {
return (this.actualFunctionReturnName != null ? this.actualFunctionReturnName : "return");
}
/**
* Specify a limited set of in parameters to be used.
*/
public void setLimitedInParameterNames(Set<String> limitedInParameterNames) {
this.limitedInParameterNames = limitedInParameterNames;
}
/**
* Get a limited set of in parameters to be used.
*/
public Set<String> getLimitedInParameterNames() {
return this.limitedInParameterNames;
}
/**
* Specify the names of the out parameters.
*/
public void setOutParameterNames(List<String> outParameterNames) {
this.outParameterNames = outParameterNames;
}
/**
* Get a list of the out parameter names.
*/
public List<String> getOutParameterNames() {
return this.outParameterNames;
}
/**
* Specify the name of the procedure.
*/
public void setProcedureName(@Nullable String procedureName) {
this.procedureName = procedureName;
}
/**
* Get the name of the procedure.
*/
@Nullable
public String getProcedureName() {
return this.procedureName;
}
/**
* Specify the name of the catalog.
*/
public void setCatalogName(@Nullable String catalogName) {
this.catalogName = catalogName;
}
/**
* Get the name of the catalog.
*/
@Nullable
public String getCatalogName() {
return this.catalogName;
}
/**
* Specify the name of the schema.
*/
public void setSchemaName(@Nullable String schemaName) {
this.schemaName = schemaName;
}
/**
* Get the name of the schema.
*/
@Nullable
public String getSchemaName() {
return this.schemaName;
}
/**
* Specify whether this call is a function call.
*/
public void setFunction(boolean function) {
this.function = function;
}
/**
* Check whether this call is a function call.
*/
public boolean isFunction() {
return this.function;
}
/**
* Specify whether a return value is required.
*/
public void setReturnValueRequired(boolean returnValueRequired) {
this.returnValueRequired = returnValueRequired;
}
/**
* Check whether a return value is required.
*/
public boolean isReturnValueRequired() {
return this.returnValueRequired;
}
/**
* Specify whether call parameter meta-data should be accessed.
*/
public void setAccessCallParameterMetaData(boolean accessCallParameterMetaData) {
this.accessCallParameterMetaData = accessCallParameterMetaData;
}
/**
* Check whether call parameter meta-data should be accessed.
*/
public boolean isAccessCallParameterMetaData() {
return this.accessCallParameterMetaData;
}
/**
* Specify whether parameters should be bound by name.
* @since 4.2
*/
public void setNamedBinding(boolean namedBinding) {
this.namedBinding = namedBinding;
}
/**
* Check whether parameters should be bound by name.
* @since 4.2
*/
public boolean isNamedBinding() {
return this.namedBinding;
}
/**
* Initialize this class with meta-data from the database.
* @param dataSource the DataSource used to retrieve meta-data
*/
public void initializeMetaData(DataSource dataSource) {
this.metaDataProvider = CallMetaDataProviderFactory.createMetaDataProvider(dataSource, this);
}
private CallMetaDataProvider obtainMetaDataProvider() {
Assert.state(this.metaDataProvider != null, "No CallMetaDataProvider - call initializeMetaData first");
return this.metaDataProvider;
}
/**
* Create a ReturnResultSetParameter/SqlOutParameter depending on the support provided
* by the JDBC driver used for the database in use.
* @param parameterName the name of the parameter (also used as the name of the List returned in the output)
* @param rowMapper a RowMapper implementation used to map the data returned in the result set
* @return the appropriate SqlParameter
*/
public SqlParameter createReturnResultSetParameter(String parameterName, RowMapper<?> rowMapper) {
CallMetaDataProvider provider = obtainMetaDataProvider();
if (provider.isReturnResultSetSupported()) {
return new SqlReturnResultSet(parameterName, rowMapper);
}
else {
if (provider.isRefCursorSupported()) {
return new SqlOutParameter(parameterName, provider.getRefCursorSqlType(), rowMapper);
}
else {
throw new InvalidDataAccessApiUsageException(
"Return of a ResultSet from a stored procedure is not supported");
}
}
}
/**
* Get the name of the single out parameter for this call.
* If there are multiple parameters, the name of the first one will be returned.
*/
@Nullable
public String getScalarOutParameterName() {
if (isFunction()) {
return getFunctionReturnName();
}
else {
if (this.outParameterNames.size() > 1) {
logger.info("Accessing single output value when procedure has more than one output parameter");
}
return (!this.outParameterNames.isEmpty() ? this.outParameterNames.get(0) : null);
}
}
/**
* Get the List of SqlParameter objects to be used in call execution.
*/
public List<SqlParameter> getCallParameters() {
return this.callParameters;
}
/**
* Process the list of parameters provided, and if procedure column meta-data is used,
* the parameters will be matched against the meta-data information and any missing
* ones will be automatically included.
* @param parameters the list of parameters to use as a base
*/
public void processParameters(List<SqlParameter> parameters) {
this.callParameters = reconcileParameters(parameters);
}
/**
* Reconcile the provided parameters with available meta-data and add new ones where appropriate.
*/
protected List<SqlParameter> reconcileParameters(List<SqlParameter> parameters) {
CallMetaDataProvider provider = obtainMetaDataProvider();
final List<SqlParameter> declaredReturnParams = new ArrayList<>();
final Map<String, SqlParameter> declaredParams = new LinkedHashMap<>();
boolean returnDeclared = false;
List<String> outParamNames = new ArrayList<>();
List<String> metaDataParamNames = new ArrayList<>();
// Get the names of the meta-data parameters
for (CallParameterMetaData meta : provider.getCallParameterMetaData()) {
if (!meta.isReturnParameter()) {
metaDataParamNames.add(lowerCase(meta.getParameterName()));
}
}
// Separate implicit return parameters from explicit parameters...
for (SqlParameter param : parameters) {
if (param.isResultsParameter()) {
declaredReturnParams.add(param);
}
else {
String paramName = param.getName();
if (paramName == null) {
throw new IllegalArgumentException("Anonymous parameters not supported for calls - " +
"please specify a name for the parameter of SQL type " + param.getSqlType());
}
String paramNameToMatch = lowerCase(provider.parameterNameToUse(paramName));
declaredParams.put(paramNameToMatch, param);
if (param instanceof SqlOutParameter) {
outParamNames.add(paramName);
if (isFunction() && !metaDataParamNames.contains(paramNameToMatch) && !returnDeclared) {
if (logger.isDebugEnabled()) {
logger.debug("Using declared out parameter '" + paramName +
"' for function return value");
}
this.actualFunctionReturnName = paramName;
returnDeclared = true;
}
}
}
}
setOutParameterNames(outParamNames);
List<SqlParameter> workParams = new ArrayList<>(declaredReturnParams);
if (!provider.isProcedureColumnMetaDataUsed()) {
workParams.addAll(declaredParams.values());
return workParams;
}
Map<String, String> limitedInParamNamesMap = CollectionUtils.newHashMap(this.limitedInParameterNames.size());
for (String limitedParamName : this.limitedInParameterNames) {
limitedInParamNamesMap.put(lowerCase(provider.parameterNameToUse(limitedParamName)), limitedParamName);
}
for (CallParameterMetaData meta : provider.getCallParameterMetaData()) {
String paramName = meta.getParameterName();
String paramNameToCheck = null;
if (paramName != null) {
paramNameToCheck = lowerCase(provider.parameterNameToUse(paramName));
}
String paramNameToUse = provider.parameterNameToUse(paramName);
if (declaredParams.containsKey(paramNameToCheck) || (meta.isReturnParameter() && returnDeclared)) {
SqlParameter param;
if (meta.isReturnParameter()) {
param = declaredParams.get(getFunctionReturnName());
if (param == null && !getOutParameterNames().isEmpty()) {
param = declaredParams.get(getOutParameterNames().get(0).toLowerCase());
}
if (param == null) {
throw new InvalidDataAccessApiUsageException(
"Unable to locate declared parameter for function return value - " +
" add an SqlOutParameter with name '" + getFunctionReturnName() + "'");
}
else {
this.actualFunctionReturnName = param.getName();
}
}
else {
param = declaredParams.get(paramNameToCheck);
}
if (param != null) {
workParams.add(param);
if (logger.isDebugEnabled()) {
logger.debug("Using declared parameter for '" +
(paramNameToUse != null ? paramNameToUse : getFunctionReturnName()) + "'");
}
}
}
else {
if (meta.isReturnParameter()) {
// DatabaseMetaData.procedureColumnReturn or possibly procedureColumnResult
if (!isFunction() && !isReturnValueRequired() && paramName != null &&
provider.byPassReturnParameter(paramName)) {
if (logger.isDebugEnabled()) {
logger.debug("Bypassing meta-data return parameter for '" + paramName + "'");
}
}
else {
String returnNameToUse =
(StringUtils.hasLength(paramNameToUse) ? paramNameToUse : getFunctionReturnName());
workParams.add(provider.createDefaultOutParameter(returnNameToUse, meta));
if (isFunction()) {
this.actualFunctionReturnName = returnNameToUse;
outParamNames.add(returnNameToUse);
}
if (logger.isDebugEnabled()) {
logger.debug("Added meta-data return parameter for '" + returnNameToUse + "'");
}
}
}
else {
if (paramNameToUse == null) {
paramNameToUse = "";
}
if (meta.getParameterType() == DatabaseMetaData.procedureColumnOut) {
workParams.add(provider.createDefaultOutParameter(paramNameToUse, meta));
outParamNames.add(paramNameToUse);
if (logger.isDebugEnabled()) {
logger.debug("Added meta-data out parameter for '" + paramNameToUse + "'");
}
}
else if (meta.getParameterType() == DatabaseMetaData.procedureColumnInOut) {
workParams.add(provider.createDefaultInOutParameter(paramNameToUse, meta));
outParamNames.add(paramNameToUse);
if (logger.isDebugEnabled()) {
logger.debug("Added meta-data in-out parameter for '" + paramNameToUse + "'");
}
}
else {
// DatabaseMetaData.procedureColumnIn or possibly procedureColumnUnknown
if (this.limitedInParameterNames.isEmpty() ||
limitedInParamNamesMap.containsKey(lowerCase(paramNameToUse))) {
workParams.add(provider.createDefaultInParameter(paramNameToUse, meta));
if (logger.isDebugEnabled()) {
logger.debug("Added meta-data in parameter for '" + paramNameToUse + "'");
}
}
else {
if (logger.isDebugEnabled()) {
logger.debug("Limited set of parameters " + limitedInParamNamesMap.keySet() +
" skipped parameter for '" + paramNameToUse + "'");
}
}
}
}
}
}
return workParams;
}
/**
* Match input parameter values with the parameters declared to be used in the call.
* @param parameterSource the input values
* @return a Map containing the matched parameter names with the value taken from the input
*/
public Map<String, Object> matchInParameterValuesWithCallParameters(SqlParameterSource parameterSource) {
// For parameter source lookups we need to provide case-insensitive lookup support
// since the database meta-data is not necessarily providing case-sensitive parameter names.
Map<String, String> caseInsensitiveParameterNames =
SqlParameterSourceUtils.extractCaseInsensitiveParameterNames(parameterSource);
Map<String, String> callParameterNames = CollectionUtils.newHashMap(this.callParameters.size());
Map<String, Object> matchedParameters = CollectionUtils.newHashMap(this.callParameters.size());
for (SqlParameter parameter : this.callParameters) {
if (parameter.isInputValueProvided()) {
String parameterName = parameter.getName();
String parameterNameToMatch = obtainMetaDataProvider().parameterNameToUse(parameterName);
if (parameterNameToMatch != null) {
callParameterNames.put(parameterNameToMatch.toLowerCase(), parameterName);
}
if (parameterName != null) {
if (parameterSource.hasValue(parameterName)) {
matchedParameters.put(parameterName,
SqlParameterSourceUtils.getTypedValue(parameterSource, parameterName));
}
else {
String lowerCaseName = parameterName.toLowerCase();
if (parameterSource.hasValue(lowerCaseName)) {
matchedParameters.put(parameterName,
SqlParameterSourceUtils.getTypedValue(parameterSource, lowerCaseName));
}
else {
String englishLowerCaseName = parameterName.toLowerCase(Locale.ENGLISH);
if (parameterSource.hasValue(englishLowerCaseName)) {
matchedParameters.put(parameterName,
SqlParameterSourceUtils.getTypedValue(parameterSource, englishLowerCaseName));
}
else {
String propertyName = JdbcUtils.convertUnderscoreNameToPropertyName(parameterName);
if (parameterSource.hasValue(propertyName)) {
matchedParameters.put(parameterName,
SqlParameterSourceUtils.getTypedValue(parameterSource, propertyName));
}
else {
if (caseInsensitiveParameterNames.containsKey(lowerCaseName)) {
String sourceName = caseInsensitiveParameterNames.get(lowerCaseName);
matchedParameters.put(parameterName,
SqlParameterSourceUtils.getTypedValue(parameterSource, sourceName));
}
else if (logger.isInfoEnabled()) {
logger.info("Unable to locate the corresponding parameter value for '" +
parameterName + "' within the parameter values provided: " +
caseInsensitiveParameterNames.values());
}
}
}
}
}
}
}
}
if (logger.isDebugEnabled()) {
logger.debug("Matching " + caseInsensitiveParameterNames.values() + " with " + callParameterNames.values());
logger.debug("Found match for " + matchedParameters.keySet());
}
return matchedParameters;
}
/**
* Match input parameter values with the parameters declared to be used in the call.
* @param inParameters the input values
* @return a Map containing the matched parameter names with the value taken from the input
*/
public Map<String, ?> matchInParameterValuesWithCallParameters(Map<String, ?> inParameters) {
CallMetaDataProvider provider = obtainMetaDataProvider();
if (!provider.isProcedureColumnMetaDataUsed()) {
return inParameters;
}
Map<String, String> callParameterNames = CollectionUtils.newHashMap(this.callParameters.size());
for (SqlParameter parameter : this.callParameters) {
if (parameter.isInputValueProvided()) {
String parameterName = parameter.getName();
String parameterNameToMatch = provider.parameterNameToUse(parameterName);
if (parameterNameToMatch != null) {
callParameterNames.put(parameterNameToMatch.toLowerCase(), parameterName);
}
}
}
Map<String, Object> matchedParameters = CollectionUtils.newHashMap(inParameters.size());
inParameters.forEach((parameterName, parameterValue) -> {
String parameterNameToMatch = provider.parameterNameToUse(parameterName);
String callParameterName = callParameterNames.get(lowerCase(parameterNameToMatch));
if (callParameterName == null) {
if (logger.isDebugEnabled()) {
Object value = parameterValue;
if (value instanceof SqlParameterValue) {
value = ((SqlParameterValue) value).getValue();
}
if (value != null) {
logger.debug("Unable to locate the corresponding IN or IN-OUT parameter for \"" +
parameterName + "\" in the parameters used: " + callParameterNames.keySet());
}
}
}
else {
matchedParameters.put(callParameterName, parameterValue);
}
});
if (matchedParameters.size() < callParameterNames.size()) {
for (String parameterName : callParameterNames.keySet()) {
String parameterNameToMatch = provider.parameterNameToUse(parameterName);
String callParameterName = callParameterNames.get(lowerCase(parameterNameToMatch));
if (!matchedParameters.containsKey(callParameterName) && logger.isInfoEnabled()) {
logger.info("Unable to locate the corresponding parameter value for '" + parameterName +
"' within the parameter values provided: " + inParameters.keySet());
}
}
}
if (logger.isDebugEnabled()) {
logger.debug("Matching " + inParameters.keySet() + " with " + callParameterNames.values());
logger.debug("Found match for " + matchedParameters.keySet());
}
return matchedParameters;
}
public Map<String, ?> matchInParameterValuesWithCallParameters(Object[] parameterValues) {
Map<String, Object> matchedParameters = CollectionUtils.newHashMap(parameterValues.length);
int i = 0;
for (SqlParameter parameter : this.callParameters) {
if (parameter.isInputValueProvided()) {
String parameterName = parameter.getName();
matchedParameters.put(parameterName, parameterValues[i++]);
}
}
return matchedParameters;
}
/**
* Build the call string based on configuration and meta-data information.
* @return the call string to be used
*/
public String createCallString() {
Assert.state(this.metaDataProvider != null, "No CallMetaDataProvider available");
StringBuilder callString;
int parameterCount = 0;
String catalogNameToUse;
String schemaNameToUse;
// For Oracle where catalogs are not supported we need to reverse the schema name
// and the catalog name since the catalog is used for the package name
if (this.metaDataProvider.isSupportsSchemasInProcedureCalls() &&
!this.metaDataProvider.isSupportsCatalogsInProcedureCalls()) {
schemaNameToUse = this.metaDataProvider.catalogNameToUse(getCatalogName());
catalogNameToUse = this.metaDataProvider.schemaNameToUse(getSchemaName());
}
else {
catalogNameToUse = this.metaDataProvider.catalogNameToUse(getCatalogName());
schemaNameToUse = this.metaDataProvider.schemaNameToUse(getSchemaName());
}
if (isFunction() || isReturnValueRequired()) {
callString = new StringBuilder("{? = call ");
parameterCount = -1;
}
else {
callString = new StringBuilder("{call ");
}
if (StringUtils.hasLength(catalogNameToUse)) {
callString.append(catalogNameToUse).append('.');
}
if (StringUtils.hasLength(schemaNameToUse)) {
callString.append(schemaNameToUse).append('.');
}
callString.append(this.metaDataProvider.procedureNameToUse(getProcedureName()));
callString.append('(');
for (SqlParameter parameter : this.callParameters) {
if (!parameter.isResultsParameter()) {
if (parameterCount > 0) {
callString.append(", ");
}
if (parameterCount >= 0) {
callString.append(createParameterBinding(parameter));
}
parameterCount++;
}
}
callString.append(")}");
return callString.toString();
}
/**
* Build the parameter binding fragment.
* @param parameter call parameter
* @return parameter binding fragment
* @since 4.2
*/
protected String createParameterBinding(SqlParameter parameter) {
return (isNamedBinding() ? parameter.getName() + " => ?" : "?");
}
private static String lowerCase(@Nullable String paramName) {
return (paramName != null ? paramName.toLowerCase() : "");
}
}
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